Theory of complete lattices #

Main definitions #

sSup and sInf are the supremum and the infimum of a set;
iSup (f : ι → α) and iInf (f : ι → α) are indexed supremum and infimum of a function, defined as sSup and sInf of the range of this function;
class CompleteLattice: a bounded lattice such that sSup s is always the least upper boundary of s and sInf s is always the greatest lower boundary of s;
class CompleteLinearOrder: a linear ordered complete lattice.

Naming conventions #

In lemma names,

sSup is called sSup
sInf is called sInf
⨆ i, s i is called iSup
⨅ i, s i is called iInf
⨆ i j, s i j is called iSup₂. This is an iSup inside an iSup.
⨅ i j, s i j is called iInf₂. This is an iInf inside an iInf.
⨆ i ∈ s, t i is called biSup for "bounded iSup". This is the special case of iSup₂ where j : i ∈ s.
⨅ i ∈ s, t i is called biInf for "bounded iInf". This is the special case of iInf₂ where j : i ∈ s.

Notation #

⨆ i, f i : iSup f, the supremum of the range of f;
⨅ i, f i : iInf f, the infimum of the range of f.

source

@[simp]

theorem iSup_ulift {α : Type u_1} {ι : Type u_9} [SupSet α] (f : ULift.{u_10, u_9} ι → α) :

⨆ (i : ULift.{u_10, u_9} ι), f i = ⨆ (i : ι), f { down := i }

source

@[simp]

theorem iInf_ulift {α : Type u_1} {ι : Type u_9} [InfSet α] (f : ULift.{u_10, u_9} ι → α) :

⨅ (i : ULift.{u_10, u_9} ι), f i = ⨅ (i : ι), f { down := i }

source

instance OrderDual.supSet (α : Type u_9) [InfSet α] :

SupSet αᵒᵈ

Equations

OrderDual.supSet α = { sSup := sInf }

source

instance OrderDual.infSet (α : Type u_9) [SupSet α] :

InfSet αᵒᵈ

Equations

OrderDual.infSet α = { sInf := sSup }

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class CompleteSemilatticeSup (α : Type u_9) extends PartialOrder , SupSet :

Type u_9

Note that we rarely use CompleteSemilatticeSup (in fact, any such object is always a CompleteLattice, so it's usually best to start there).

Nevertheless it is sometimes a useful intermediate step in constructions.

le : α → α → Prop
lt : α → α → Prop
le_refl : ∀ (a : α), a ≤ a
le_trans : ∀ (a b c : α), a ≤ b → b ≤ c → a ≤ c
lt_iff_le_not_le : ∀ (a b : α), a < b ↔ a ≤ b ∧ ¬b ≤ a
le_antisymm : ∀ (a b : α), a ≤ b → b ≤ a → a = b
sSup : Set α → α
le_sSup : ∀ (s : Set α), ∀ a ∈ s, a ≤ sSup s
Any element of a set is less than the set supremum.
sSup_le : ∀ (s : Set α) (a : α), (∀ b ∈ s, b ≤ a) → sSup s ≤ a
Any upper bound is more than the set supremum.

Instances

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theorem CompleteSemilatticeSup.le_sSup {α : Type u_9} [self : CompleteSemilatticeSup α] (s : Set α) (a : α) :

a ∈ s → a ≤ sSup s

Any element of a set is less than the set supremum.

source

theorem CompleteSemilatticeSup.sSup_le {α : Type u_9} [self : CompleteSemilatticeSup α] (s : Set α) (a : α) :

(∀ b ∈ s, b ≤ a) → sSup s ≤ a

Any upper bound is more than the set supremum.

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theorem le_sSup {α : Type u_1} [CompleteSemilatticeSup α] {s : Set α} {a : α} :

a ∈ s → a ≤ sSup s

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theorem sSup_le {α : Type u_1} [CompleteSemilatticeSup α] {s : Set α} {a : α} :

(∀ b ∈ s, b ≤ a) → sSup s ≤ a

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theorem isLUB_sSup {α : Type u_1} [CompleteSemilatticeSup α] (s : Set α) :

IsLUB s (sSup s)

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theorem isLUB_iff_sSup_eq {α : Type u_1} [CompleteSemilatticeSup α] {s : Set α} {a : α} :

IsLUB s a ↔ sSup s = a

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theorem IsLUB.sSup_eq {α : Type u_1} [CompleteSemilatticeSup α] {s : Set α} {a : α} :

IsLUB s a → sSup s = a

Alias of the forward direction of isLUB_iff_sSup_eq.

source

theorem le_sSup_of_le {α : Type u_1} [CompleteSemilatticeSup α] {s : Set α} {a : α} {b : α} (hb : b ∈ s) (h : a ≤ b) :

a ≤ sSup s

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theorem sSup_le_sSup {α : Type u_1} [CompleteSemilatticeSup α] {s : Set α} {t : Set α} (h : s ⊆ t) :

sSup s ≤ sSup t

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@[simp]

theorem sSup_le_iff {α : Type u_1} [CompleteSemilatticeSup α] {s : Set α} {a : α} :

sSup s ≤ a ↔ ∀ b ∈ s, b ≤ a

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theorem le_sSup_iff {α : Type u_1} [CompleteSemilatticeSup α] {s : Set α} {a : α} :

a ≤ sSup s ↔ ∀ b ∈ upperBounds s, a ≤ b

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theorem le_iSup_iff {α : Type u_1} {ι : Sort u_5} [CompleteSemilatticeSup α] {a : α} {s : ι → α} :

a ≤ iSup s ↔ ∀ (b : α), (∀ (i : ι), s i ≤ b) → a ≤ b

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theorem sSup_le_sSup_of_forall_exists_le {α : Type u_1} [CompleteSemilatticeSup α] {s : Set α} {t : Set α} (h : ∀ x ∈ s, ∃ y ∈ t, x ≤ y) :

sSup s ≤ sSup t

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theorem sSup_singleton {α : Type u_1} [CompleteSemilatticeSup α] {a : α} :

sSup {a} = a

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class CompleteSemilatticeInf (α : Type u_9) extends PartialOrder , InfSet :

Type u_9

Note that we rarely use CompleteSemilatticeInf (in fact, any such object is always a CompleteLattice, so it's usually best to start there).

Nevertheless it is sometimes a useful intermediate step in constructions.

le : α → α → Prop
lt : α → α → Prop
le_refl : ∀ (a : α), a ≤ a
le_trans : ∀ (a b c : α), a ≤ b → b ≤ c → a ≤ c
lt_iff_le_not_le : ∀ (a b : α), a < b ↔ a ≤ b ∧ ¬b ≤ a
le_antisymm : ∀ (a b : α), a ≤ b → b ≤ a → a = b
sInf : Set α → α
sInf_le : ∀ (s : Set α), ∀ a ∈ s, sInf s ≤ a
Any element of a set is more than the set infimum.
le_sInf : ∀ (s : Set α) (a : α), (∀ b ∈ s, a ≤ b) → a ≤ sInf s
Any lower bound is less than the set infimum.

Instances

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theorem CompleteSemilatticeInf.sInf_le {α : Type u_9} [self : CompleteSemilatticeInf α] (s : Set α) (a : α) :

a ∈ s → sInf s ≤ a

Any element of a set is more than the set infimum.

source

theorem CompleteSemilatticeInf.le_sInf {α : Type u_9} [self : CompleteSemilatticeInf α] (s : Set α) (a : α) :

(∀ b ∈ s, a ≤ b) → a ≤ sInf s

Any lower bound is less than the set infimum.

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theorem sInf_le {α : Type u_1} [CompleteSemilatticeInf α] {s : Set α} {a : α} :

a ∈ s → sInf s ≤ a

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theorem le_sInf {α : Type u_1} [CompleteSemilatticeInf α] {s : Set α} {a : α} :

(∀ b ∈ s, a ≤ b) → a ≤ sInf s

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theorem isGLB_sInf {α : Type u_1} [CompleteSemilatticeInf α] (s : Set α) :

IsGLB s (sInf s)

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theorem isGLB_iff_sInf_eq {α : Type u_1} [CompleteSemilatticeInf α] {s : Set α} {a : α} :

IsGLB s a ↔ sInf s = a

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theorem IsGLB.sInf_eq {α : Type u_1} [CompleteSemilatticeInf α] {s : Set α} {a : α} :

IsGLB s a → sInf s = a

Alias of the forward direction of isGLB_iff_sInf_eq.

source

theorem sInf_le_of_le {α : Type u_1} [CompleteSemilatticeInf α] {s : Set α} {a : α} {b : α} (hb : b ∈ s) (h : b ≤ a) :

sInf s ≤ a

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theorem sInf_le_sInf {α : Type u_1} [CompleteSemilatticeInf α] {s : Set α} {t : Set α} (h : s ⊆ t) :

sInf t ≤ sInf s

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@[simp]

theorem le_sInf_iff {α : Type u_1} [CompleteSemilatticeInf α] {s : Set α} {a : α} :

a ≤ sInf s ↔ ∀ b ∈ s, a ≤ b

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theorem sInf_le_iff {α : Type u_1} [CompleteSemilatticeInf α] {s : Set α} {a : α} :

sInf s ≤ a ↔ ∀ b ∈ lowerBounds s, b ≤ a

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theorem iInf_le_iff {α : Type u_1} {ι : Sort u_5} [CompleteSemilatticeInf α] {a : α} {s : ι → α} :

iInf s ≤ a ↔ ∀ (b : α), (∀ (i : ι), b ≤ s i) → b ≤ a

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theorem sInf_le_sInf_of_forall_exists_le {α : Type u_1} [CompleteSemilatticeInf α] {s : Set α} {t : Set α} (h : ∀ x ∈ s, ∃ y ∈ t, y ≤ x) :

sInf t ≤ sInf s

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theorem sInf_singleton {α : Type u_1} [CompleteSemilatticeInf α] {a : α} :

sInf {a} = a

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class CompleteLattice (α : Type u_9) extends Lattice , SupSet , InfSet , Top , Bot :

Type u_9

A complete lattice is a bounded lattice which has suprema and infima for every subset.

sup : α → α → α
le : α → α → Prop
lt : α → α → Prop
le_refl : ∀ (a : α), a ≤ a
le_trans : ∀ (a b c : α), a ≤ b → b ≤ c → a ≤ c
lt_iff_le_not_le : ∀ (a b : α), a < b ↔ a ≤ b ∧ ¬b ≤ a
le_antisymm : ∀ (a b : α), a ≤ b → b ≤ a → a = b
le_sup_left : ∀ (a b : α), a ≤ a ⊔ b
le_sup_right : ∀ (a b : α), b ≤ a ⊔ b
sup_le : ∀ (a b c : α), a ≤ c → b ≤ c → a ⊔ b ≤ c
inf : α → α → α
inf_le_left : ∀ (a b : α), a ⊓ b ≤ a
inf_le_right : ∀ (a b : α), a ⊓ b ≤ b
le_inf : ∀ (a b c : α), a ≤ b → a ≤ c → a ≤ b ⊓ c
sSup : Set α → α
le_sSup : ∀ (s : Set α), ∀ a ∈ s, a ≤ sSup s
Any element of a set is less than the set supremum.
sSup_le : ∀ (s : Set α) (a : α), (∀ b ∈ s, b ≤ a) → sSup s ≤ a
Any upper bound is more than the set supremum.
sInf : Set α → α
sInf_le : ∀ (s : Set α), ∀ a ∈ s, sInf s ≤ a
Any element of a set is more than the set infimum.
le_sInf : ∀ (s : Set α) (a : α), (∀ b ∈ s, a ≤ b) → a ≤ sInf s
Any lower bound is less than the set infimum.
top : α
bot : α
le_top : ∀ (x : α), x ≤ ⊤
Any element is less than the top one.
bot_le : ∀ (x : α), ⊥ ≤ x
Any element is more than the bottom one.

Instances

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theorem CompleteLattice.le_top {α : Type u_9} [self : CompleteLattice α] (x : α) :

x ≤ ⊤

Any element is less than the top one.

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theorem CompleteLattice.bot_le {α : Type u_9} [self : CompleteLattice α] (x : α) :

⊥ ≤ x

Any element is more than the bottom one.

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@[instance 100]

instance CompleteLattice.toBoundedOrder {α : Type u_1} [h : CompleteLattice α] :

BoundedOrder α

Equations

CompleteLattice.toBoundedOrder = BoundedOrder.mk

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def completeLatticeOfInf (α : Type u_9) [H1 : PartialOrder α] [H2 : InfSet α] (isGLB_sInf : ∀ (s : Set α), IsGLB s (sInf s)) :

CompleteLattice α

Create a CompleteLattice from a PartialOrder and InfSet that returns the greatest lower bound of a set. Usually this constructor provides poor definitional equalities. If other fields are known explicitly, they should be provided; for example, if inf is known explicitly, construct the CompleteLattice instance as

instance : CompleteLattice my_T where
  inf := better_inf
  le_inf := ...
  inf_le_right := ...
  inf_le_left := ...
  -- don't care to fix sup, sSup, bot, top
  __ := completeLatticeOfInf my_T _

Equations

completeLatticeOfInf α isGLB_sInf = CompleteLattice.mk ⋯ ⋯ ⋯ ⋯ ⋯ ⋯

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def completeLatticeOfCompleteSemilatticeInf (α : Type u_9) [CompleteSemilatticeInf α] :

CompleteLattice α

Any CompleteSemilatticeInf is in fact a CompleteLattice.

Note that this construction has bad definitional properties: see the doc-string on completeLatticeOfInf.

Equations

completeLatticeOfCompleteSemilatticeInf α = completeLatticeOfInf α ⋯

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def completeLatticeOfSup (α : Type u_9) [H1 : PartialOrder α] [H2 : SupSet α] (isLUB_sSup : ∀ (s : Set α), IsLUB s (sSup s)) :

CompleteLattice α

Create a CompleteLattice from a PartialOrder and SupSet that returns the least upper bound of a set. Usually this constructor provides poor definitional equalities. If other fields are known explicitly, they should be provided; for example, if inf is known explicitly, construct the CompleteLattice instance as

instance : CompleteLattice my_T where
  inf := better_inf
  le_inf := ...
  inf_le_right := ...
  inf_le_left := ...
  -- don't care to fix sup, sInf, bot, top
  __ := completeLatticeOfSup my_T _

Equations

completeLatticeOfSup α isLUB_sSup = CompleteLattice.mk ⋯ ⋯ ⋯ ⋯ ⋯ ⋯

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def completeLatticeOfCompleteSemilatticeSup (α : Type u_9) [CompleteSemilatticeSup α] :

CompleteLattice α

Any CompleteSemilatticeSup is in fact a CompleteLattice.

Note that this construction has bad definitional properties: see the doc-string on completeLatticeOfSup.

Equations

completeLatticeOfCompleteSemilatticeSup α = completeLatticeOfSup α ⋯

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class CompleteLinearOrder (α : Type u_9) extends CompleteLattice , HImp , HasCompl , SDiff , HNot :

Type u_9

A complete linear order is a linear order whose lattice structure is complete.

sup : α → α → α
le : α → α → Prop
lt : α → α → Prop
le_refl : ∀ (a : α), a ≤ a
le_trans : ∀ (a b c : α), a ≤ b → b ≤ c → a ≤ c
lt_iff_le_not_le : ∀ (a b : α), a < b ↔ a ≤ b ∧ ¬b ≤ a
le_antisymm : ∀ (a b : α), a ≤ b → b ≤ a → a = b
le_sup_left : ∀ (a b : α), a ≤ a ⊔ b
le_sup_right : ∀ (a b : α), b ≤ a ⊔ b
sup_le : ∀ (a b c : α), a ≤ c → b ≤ c → a ⊔ b ≤ c
inf : α → α → α
inf_le_left : ∀ (a b : α), a ⊓ b ≤ a
inf_le_right : ∀ (a b : α), a ⊓ b ≤ b
le_inf : ∀ (a b c : α), a ≤ b → a ≤ c → a ≤ b ⊓ c
sSup : Set α → α
le_sSup : ∀ (s : Set α), ∀ a ∈ s, a ≤ sSup s
sSup_le : ∀ (s : Set α) (a : α), (∀ b ∈ s, b ≤ a) → sSup s ≤ a
sInf : Set α → α
sInf_le : ∀ (s : Set α), ∀ a ∈ s, sInf s ≤ a
le_sInf : ∀ (s : Set α) (a : α), (∀ b ∈ s, a ≤ b) → a ≤ sInf s
top : α
bot : α
le_top : ∀ (x : α), x ≤ ⊤
bot_le : ∀ (x : α), ⊥ ≤ x
himp : α → α → α
le_himp_iff : ∀ (a b c : α), a ≤ b ⇨ c ↔ a ⊓ b ≤ c
(a ⇨ ·) is right adjoint to (a ⊓ ·)
compl : α → α
himp_bot : ∀ (a : α), a ⇨ ⊥ = aᶜ
aᶜ is defined as a ⇨ ⊥
sdiff : α → α → α
hnot : α → α
sdiff_le_iff : ∀ (a b c : α), a \ b ≤ c ↔ a ≤ b ⊔ c
(· \ a) is right adjoint to (· ⊔ a)
top_sdiff : ∀ (a : α), ⊤ \ a = ￢a
⊤ \ a is ￢a
le_total : ∀ (a b : α), a ≤ b ∨ b ≤ a
A linear order is total.
decidableLE : DecidableRel fun (x1 x2 : α) => x1 ≤ x2
In a linearly ordered type, we assume the order relations are all decidable.
decidableEq : DecidableEq α
In a linearly ordered type, we assume the order relations are all decidable.
decidableLT : DecidableRel fun (x1 x2 : α) => x1 < x2
In a linearly ordered type, we assume the order relations are all decidable.

Instances

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theorem CompleteLinearOrder.le_total {α : Type u_9} [self : CompleteLinearOrder α] (a : α) (b : α) :

a ≤ b ∨ b ≤ a

A linear order is total.

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instance CompleteLinearOrder.toLinearOrder {α : Type u_1} [i : CompleteLinearOrder α] :

LinearOrder α

Equations

CompleteLinearOrder.toLinearOrder = LinearOrder.mk ⋯ CompleteLinearOrder.decidableLE CompleteLinearOrder.decidableEq CompleteLinearOrder.decidableLT ⋯ ⋯ ⋯

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instance OrderDual.instCompleteLattice {α : Type u_1} [CompleteLattice α] :

CompleteLattice αᵒᵈ

Equations

OrderDual.instCompleteLattice = CompleteLattice.mk ⋯ ⋯ ⋯ ⋯ ⋯ ⋯

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instance OrderDual.instCompleteLinearOrder {α : Type u_1} [CompleteLinearOrder α] :

CompleteLinearOrder αᵒᵈ

Equations

OrderDual.instCompleteLinearOrder = CompleteLinearOrder.mk ⋯ ⋯ ⋯ ⋯ ⋯ LinearOrder.decidableLE LinearOrder.decidableEq LinearOrder.decidableLT

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@[simp]

theorem toDual_sSup {α : Type u_1} [SupSet α] (s : Set α) :

OrderDual.toDual (sSup s) = sInf (⇑OrderDual.ofDual ⁻¹' s)

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@[simp]

theorem toDual_sInf {α : Type u_1} [InfSet α] (s : Set α) :

OrderDual.toDual (sInf s) = sSup (⇑OrderDual.ofDual ⁻¹' s)

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@[simp]

theorem ofDual_sSup {α : Type u_1} [InfSet α] (s : Set αᵒᵈ) :

OrderDual.ofDual (sSup s) = sInf (⇑OrderDual.toDual ⁻¹' s)

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@[simp]

theorem ofDual_sInf {α : Type u_1} [SupSet α] (s : Set αᵒᵈ) :

OrderDual.ofDual (sInf s) = sSup (⇑OrderDual.toDual ⁻¹' s)

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@[simp]

theorem toDual_iSup {α : Type u_1} {ι : Sort u_5} [SupSet α] (f : ι → α) :

OrderDual.toDual (⨆ (i : ι), f i) = ⨅ (i : ι), OrderDual.toDual (f i)

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@[simp]

theorem toDual_iInf {α : Type u_1} {ι : Sort u_5} [InfSet α] (f : ι → α) :

OrderDual.toDual (⨅ (i : ι), f i) = ⨆ (i : ι), OrderDual.toDual (f i)

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@[simp]

theorem ofDual_iSup {α : Type u_1} {ι : Sort u_5} [InfSet α] (f : ι → αᵒᵈ) :

OrderDual.ofDual (⨆ (i : ι), f i) = ⨅ (i : ι), OrderDual.ofDual (f i)

source

@[simp]

theorem ofDual_iInf {α : Type u_1} {ι : Sort u_5} [SupSet α] (f : ι → αᵒᵈ) :

OrderDual.ofDual (⨅ (i : ι), f i) = ⨆ (i : ι), OrderDual.ofDual (f i)

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theorem sInf_le_sSup {α : Type u_1} [CompleteLattice α] {s : Set α} (hs : s.Nonempty) :

sInf s ≤ sSup s

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theorem sSup_union {α : Type u_1} [CompleteLattice α] {s : Set α} {t : Set α} :

sSup (s ∪ t) = sSup s ⊔ sSup t

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theorem sInf_union {α : Type u_1} [CompleteLattice α] {s : Set α} {t : Set α} :

sInf (s ∪ t) = sInf s ⊓ sInf t

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theorem sSup_inter_le {α : Type u_1} [CompleteLattice α] {s : Set α} {t : Set α} :

sSup (s ∩ t) ≤ sSup s ⊓ sSup t

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theorem le_sInf_inter {α : Type u_1} [CompleteLattice α] {s : Set α} {t : Set α} :

sInf s ⊔ sInf t ≤ sInf (s ∩ t)

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@[simp]

theorem sSup_empty {α : Type u_1} [CompleteLattice α] :

sSup ∅ = ⊥

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@[simp]

theorem sInf_empty {α : Type u_1} [CompleteLattice α] :

sInf ∅ = ⊤

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@[simp]

theorem sSup_univ {α : Type u_1} [CompleteLattice α] :

sSup Set.univ = ⊤

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@[simp]

theorem sInf_univ {α : Type u_1} [CompleteLattice α] :

sInf Set.univ = ⊥

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@[simp]

theorem sSup_insert {α : Type u_1} [CompleteLattice α] {a : α} {s : Set α} :

sSup (insert a s) = a ⊔ sSup s

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@[simp]

theorem sInf_insert {α : Type u_1} [CompleteLattice α] {a : α} {s : Set α} :

sInf (insert a s) = a ⊓ sInf s

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theorem sSup_le_sSup_of_subset_insert_bot {α : Type u_1} [CompleteLattice α] {s : Set α} {t : Set α} (h : s ⊆ insert ⊥ t) :

sSup s ≤ sSup t

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theorem sInf_le_sInf_of_subset_insert_top {α : Type u_1} [CompleteLattice α] {s : Set α} {t : Set α} (h : s ⊆ insert ⊤ t) :

sInf t ≤ sInf s

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@[simp]

theorem sSup_diff_singleton_bot {α : Type u_1} [CompleteLattice α] (s : Set α) :

sSup (s \ {⊥}) = sSup s

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@[simp]

theorem sInf_diff_singleton_top {α : Type u_1} [CompleteLattice α] (s : Set α) :

sInf (s \ {⊤}) = sInf s

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theorem sSup_pair {α : Type u_1} [CompleteLattice α] {a : α} {b : α} :

sSup {a, b} = a ⊔ b

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theorem sInf_pair {α : Type u_1} [CompleteLattice α] {a : α} {b : α} :

sInf {a, b} = a ⊓ b

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@[simp]

theorem sSup_eq_bot {α : Type u_1} [CompleteLattice α] {s : Set α} :

sSup s = ⊥ ↔ ∀ a ∈ s, a = ⊥

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@[simp]

theorem sInf_eq_top {α : Type u_1} [CompleteLattice α] {s : Set α} :

sInf s = ⊤ ↔ ∀ a ∈ s, a = ⊤

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theorem sSup_eq_bot' {α : Type u_1} [CompleteLattice α] {s : Set α} :

sSup s = ⊥ ↔ s = ∅ ∨ s = {⊥}

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theorem eq_singleton_bot_of_sSup_eq_bot_of_nonempty {α : Type u_1} [CompleteLattice α] {s : Set α} (h_sup : sSup s = ⊥) (hne : s.Nonempty) :

s = {⊥}

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theorem eq_singleton_top_of_sInf_eq_top_of_nonempty {α : Type u_1} [CompleteLattice α] {s : Set α} :

sInf s = ⊤ → s.Nonempty → s = {⊤}

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theorem sSup_eq_of_forall_le_of_forall_lt_exists_gt {α : Type u_1} [CompleteLattice α] {s : Set α} {b : α} (h₁ : ∀ a ∈ s, a ≤ b) (h₂ : ∀ w < b, ∃ a ∈ s, w < a) :

sSup s = b

Introduction rule to prove that b is the supremum of s: it suffices to check that b is larger than all elements of s, and that this is not the case of any w < b. See csSup_eq_of_forall_le_of_forall_lt_exists_gt for a version in conditionally complete lattices.

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theorem sInf_eq_of_forall_ge_of_forall_gt_exists_lt {α : Type u_1} [CompleteLattice α] {s : Set α} {b : α} :

(∀ a ∈ s, b ≤ a) → (∀ (w : α), b < w → ∃ a ∈ s, a < w) → sInf s = b

Introduction rule to prove that b is the infimum of s: it suffices to check that b is smaller than all elements of s, and that this is not the case of any w > b. See csInf_eq_of_forall_ge_of_forall_gt_exists_lt for a version in conditionally complete lattices.

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theorem lt_sSup_iff {α : Type u_1} [CompleteLinearOrder α] {s : Set α} {b : α} :

b < sSup s ↔ ∃ a ∈ s, b < a

source

theorem sInf_lt_iff {α : Type u_1} [CompleteLinearOrder α] {s : Set α} {b : α} :

sInf s < b ↔ ∃ a ∈ s, a < b

source

theorem sSup_eq_top {α : Type u_1} [CompleteLinearOrder α] {s : Set α} :

sSup s = ⊤ ↔ ∀ b < ⊤, ∃ a ∈ s, b < a

source

theorem sInf_eq_bot {α : Type u_1} [CompleteLinearOrder α] {s : Set α} :

sInf s = ⊥ ↔ ∀ b > ⊥, ∃ a ∈ s, a < b

source

theorem lt_iSup_iff {α : Type u_1} {ι : Sort u_5} [CompleteLinearOrder α] {a : α} {f : ι → α} :

a < iSup f ↔ ∃ (i : ι), a < f i

source

theorem iInf_lt_iff {α : Type u_1} {ι : Sort u_5} [CompleteLinearOrder α] {a : α} {f : ι → α} :

iInf f < a ↔ ∃ (i : ι), f i < a

source

theorem sSup_range {α : Type u_1} {ι : Sort u_5} [SupSet α] {f : ι → α} :

sSup (Set.range f) = iSup f

source

theorem sSup_eq_iSup' {α : Type u_1} [SupSet α] (s : Set α) :

sSup s = ⨆ (a : ↑s), ↑a

source

theorem iSup_congr {α : Type u_1} {ι : Sort u_5} [SupSet α] {f : ι → α} {g : ι → α} (h : ∀ (i : ι), f i = g i) :

⨆ (i : ι), f i = ⨆ (i : ι), g i

source

theorem biSup_congr {α : Type u_1} {ι : Sort u_5} [SupSet α] {f : ι → α} {g : ι → α} {p : ι → Prop} (h : ∀ (i : ι), p i → f i = g i) :

⨆ (i : ι), ⨆ (_ : p i), f i = ⨆ (i : ι), ⨆ (_ : p i), g i

source

theorem biSup_congr' {α : Type u_1} {ι : Sort u_5} [SupSet α] {p : ι → Prop} {f : (i : ι) → p i → α} {g : (i : ι) → p i → α} (h : ∀ (i : ι) (hi : p i), f i hi = g i hi) :

⨆ (i : ι), ⨆ (hi : p i), f i hi = ⨆ (i : ι), ⨆ (hi : p i), g i hi

source

theorem Function.Surjective.iSup_comp {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [SupSet α] {f : ι → ι'} (hf : Function.Surjective f) (g : ι' → α) :

⨆ (x : ι), g (f x) = ⨆ (y : ι'), g y

source

theorem Equiv.iSup_comp {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [SupSet α] {g : ι' → α} (e : ι ≃ ι') :

⨆ (x : ι), g (e x) = ⨆ (y : ι'), g y

source

theorem Function.Surjective.iSup_congr {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [SupSet α] {f : ι → α} {g : ι' → α} (h : ι → ι') (h1 : Function.Surjective h) (h2 : ∀ (x : ι), g (h x) = f x) :

⨆ (x : ι), f x = ⨆ (y : ι'), g y

source

theorem Equiv.iSup_congr {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [SupSet α] {f : ι → α} {g : ι' → α} (e : ι ≃ ι') (h : ∀ (x : ι), g (e x) = f x) :

⨆ (x : ι), f x = ⨆ (y : ι'), g y

source

theorem iSup_congr_Prop {α : Type u_1} [SupSet α] {p : Prop} {q : Prop} {f₁ : p → α} {f₂ : q → α} (pq : p ↔ q) (f : ∀ (x : q), f₁ ⋯ = f₂ x) :

iSup f₁ = iSup f₂

source

theorem iSup_plift_up {α : Type u_1} {ι : Sort u_5} [SupSet α] (f : PLift ι → α) :

⨆ (i : ι), f { down := i } = ⨆ (i : PLift ι), f i

source

theorem iSup_plift_down {α : Type u_1} {ι : Sort u_5} [SupSet α] (f : ι → α) :

⨆ (i : PLift ι), f i.down = ⨆ (i : ι), f i

source

theorem iSup_range' {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [SupSet α] (g : β → α) (f : ι → β) :

⨆ (b : ↑(Set.range f)), g ↑b = ⨆ (i : ι), g (f i)

source

theorem sSup_image' {α : Type u_1} {β : Type u_2} [SupSet α] {s : Set β} {f : β → α} :

sSup (f '' s) = ⨆ (a : ↑s), f ↑a

source

theorem sInf_range {α : Type u_1} {ι : Sort u_5} [InfSet α] {f : ι → α} :

sInf (Set.range f) = iInf f

source

theorem sInf_eq_iInf' {α : Type u_1} [InfSet α] (s : Set α) :

sInf s = ⨅ (a : ↑s), ↑a

source

theorem iInf_congr {α : Type u_1} {ι : Sort u_5} [InfSet α] {f : ι → α} {g : ι → α} (h : ∀ (i : ι), f i = g i) :

⨅ (i : ι), f i = ⨅ (i : ι), g i

source

theorem biInf_congr {α : Type u_1} {ι : Sort u_5} [InfSet α] {f : ι → α} {g : ι → α} {p : ι → Prop} (h : ∀ (i : ι), p i → f i = g i) :

⨅ (i : ι), ⨅ (_ : p i), f i = ⨅ (i : ι), ⨅ (_ : p i), g i

source

theorem biInf_congr' {α : Type u_1} {ι : Sort u_5} [InfSet α] {p : ι → Prop} {f : (i : ι) → p i → α} {g : (i : ι) → p i → α} (h : ∀ (i : ι) (hi : p i), f i hi = g i hi) :

⨅ (i : ι), ⨅ (hi : p i), f i hi = ⨅ (i : ι), ⨅ (hi : p i), g i hi

source

theorem Function.Surjective.iInf_comp {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [InfSet α] {f : ι → ι'} (hf : Function.Surjective f) (g : ι' → α) :

⨅ (x : ι), g (f x) = ⨅ (y : ι'), g y

source

theorem Equiv.iInf_comp {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [InfSet α] {g : ι' → α} (e : ι ≃ ι') :

⨅ (x : ι), g (e x) = ⨅ (y : ι'), g y

source

theorem Function.Surjective.iInf_congr {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [InfSet α] {f : ι → α} {g : ι' → α} (h : ι → ι') (h1 : Function.Surjective h) (h2 : ∀ (x : ι), g (h x) = f x) :

⨅ (x : ι), f x = ⨅ (y : ι'), g y

source

theorem Equiv.iInf_congr {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [InfSet α] {f : ι → α} {g : ι' → α} (e : ι ≃ ι') (h : ∀ (x : ι), g (e x) = f x) :

⨅ (x : ι), f x = ⨅ (y : ι'), g y

source

theorem iInf_congr_Prop {α : Type u_1} [InfSet α] {p : Prop} {q : Prop} {f₁ : p → α} {f₂ : q → α} (pq : p ↔ q) (f : ∀ (x : q), f₁ ⋯ = f₂ x) :

iInf f₁ = iInf f₂

source

theorem iInf_plift_up {α : Type u_1} {ι : Sort u_5} [InfSet α] (f : PLift ι → α) :

⨅ (i : ι), f { down := i } = ⨅ (i : PLift ι), f i

source

theorem iInf_plift_down {α : Type u_1} {ι : Sort u_5} [InfSet α] (f : ι → α) :

⨅ (i : PLift ι), f i.down = ⨅ (i : ι), f i

source

theorem iInf_range' {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [InfSet α] (g : β → α) (f : ι → β) :

⨅ (b : ↑(Set.range f)), g ↑b = ⨅ (i : ι), g (f i)

source

theorem sInf_image' {α : Type u_1} {β : Type u_2} [InfSet α] {s : Set β} {f : β → α} :

sInf (f '' s) = ⨅ (a : ↑s), f ↑a

source

theorem le_iSup {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (f : ι → α) (i : ι) :

f i ≤ iSup f

source

theorem iInf_le {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (f : ι → α) (i : ι) :

iInf f ≤ f i

source

theorem le_iSup' {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (f : ι → α) (i : ι) :

f i ≤ iSup f

source

theorem iInf_le' {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (f : ι → α) (i : ι) :

iInf f ≤ f i

source

theorem isLUB_iSup {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} :

IsLUB (Set.range f) (⨆ (j : ι), f j)

source

theorem isGLB_iInf {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} :

IsGLB (Set.range f) (⨅ (j : ι), f j)

source

theorem IsLUB.iSup_eq {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {a : α} (h : IsLUB (Set.range f) a) :

⨆ (j : ι), f j = a

source

theorem IsGLB.iInf_eq {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {a : α} (h : IsGLB (Set.range f) a) :

⨅ (j : ι), f j = a

source

theorem le_iSup_of_le {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {a : α} (i : ι) (h : a ≤ f i) :

a ≤ iSup f

source

theorem iInf_le_of_le {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {a : α} (i : ι) (h : f i ≤ a) :

iInf f ≤ a

source

theorem le_iSup₂ {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] {f : (i : ι) → κ i → α} (i : ι) (j : κ i) :

f i j ≤ ⨆ (i : ι), ⨆ (j : κ i), f i j

source

theorem iInf₂_le {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] {f : (i : ι) → κ i → α} (i : ι) (j : κ i) :

⨅ (i : ι), ⨅ (j : κ i), f i j ≤ f i j

source

theorem le_iSup₂_of_le {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] {a : α} {f : (i : ι) → κ i → α} (i : ι) (j : κ i) (h : a ≤ f i j) :

a ≤ ⨆ (i : ι), ⨆ (j : κ i), f i j

source

theorem iInf₂_le_of_le {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] {a : α} {f : (i : ι) → κ i → α} (i : ι) (j : κ i) (h : f i j ≤ a) :

⨅ (i : ι), ⨅ (j : κ i), f i j ≤ a

source

theorem iSup_le {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {a : α} (h : ∀ (i : ι), f i ≤ a) :

iSup f ≤ a

source

theorem le_iInf {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {a : α} (h : ∀ (i : ι), a ≤ f i) :

a ≤ iInf f

source

theorem iSup₂_le {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] {a : α} {f : (i : ι) → κ i → α} (h : ∀ (i : ι) (j : κ i), f i j ≤ a) :

⨆ (i : ι), ⨆ (j : κ i), f i j ≤ a

source

theorem le_iInf₂ {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] {a : α} {f : (i : ι) → κ i → α} (h : ∀ (i : ι) (j : κ i), a ≤ f i j) :

a ≤ ⨅ (i : ι), ⨅ (j : κ i), f i j

source

theorem iSup₂_le_iSup {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (κ : ι → Sort u_9) (f : ι → α) :

⨆ (i : ι), ⨆ (x : κ i), f i ≤ ⨆ (i : ι), f i

source

theorem iInf_le_iInf₂ {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (κ : ι → Sort u_9) (f : ι → α) :

⨅ (i : ι), f i ≤ ⨅ (i : ι), ⨅ (x : κ i), f i

source

theorem iSup_mono {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {g : ι → α} (h : ∀ (i : ι), f i ≤ g i) :

iSup f ≤ iSup g

source

theorem iInf_mono {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {g : ι → α} (h : ∀ (i : ι), f i ≤ g i) :

iInf f ≤ iInf g

source

theorem iSup₂_mono {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] {f : (i : ι) → κ i → α} {g : (i : ι) → κ i → α} (h : ∀ (i : ι) (j : κ i), f i j ≤ g i j) :

⨆ (i : ι), ⨆ (j : κ i), f i j ≤ ⨆ (i : ι), ⨆ (j : κ i), g i j

source

theorem iInf₂_mono {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] {f : (i : ι) → κ i → α} {g : (i : ι) → κ i → α} (h : ∀ (i : ι) (j : κ i), f i j ≤ g i j) :

⨅ (i : ι), ⨅ (j : κ i), f i j ≤ ⨅ (i : ι), ⨅ (j : κ i), g i j

source

theorem iSup_mono' {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [CompleteLattice α] {f : ι → α} {g : ι' → α} (h : ∀ (i : ι), ∃ (i' : ι'), f i ≤ g i') :

iSup f ≤ iSup g

source

theorem iInf_mono' {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [CompleteLattice α] {f : ι → α} {g : ι' → α} (h : ∀ (i' : ι'), ∃ (i : ι), f i ≤ g i') :

iInf f ≤ iInf g

source

theorem iSup₂_mono' {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} {κ : ι → Sort u_7} {κ' : ι' → Sort u_8} [CompleteLattice α] {f : (i : ι) → κ i → α} {g : (i' : ι') → κ' i' → α} (h : ∀ (i : ι) (j : κ i), ∃ (i' : ι') (j' : κ' i'), f i j ≤ g i' j') :

⨆ (i : ι), ⨆ (j : κ i), f i j ≤ ⨆ (i : ι'), ⨆ (j : κ' i), g i j

source

theorem iInf₂_mono' {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} {κ : ι → Sort u_7} {κ' : ι' → Sort u_8} [CompleteLattice α] {f : (i : ι) → κ i → α} {g : (i' : ι') → κ' i' → α} (h : ∀ (i : ι') (j : κ' i), ∃ (i' : ι) (j' : κ i'), f i' j' ≤ g i j) :

⨅ (i : ι), ⨅ (j : κ i), f i j ≤ ⨅ (i : ι'), ⨅ (j : κ' i), g i j

source

theorem iSup_const_mono {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [CompleteLattice α] {a : α} (h : ι → ι') :

⨆ (x : ι), a ≤ ⨆ (x : ι'), a

source

theorem iInf_const_mono {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [CompleteLattice α] {a : α} (h : ι' → ι) :

⨅ (x : ι), a ≤ ⨅ (x : ι'), a

source

theorem iSup_iInf_le_iInf_iSup {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [CompleteLattice α] (f : ι → ι' → α) :

⨆ (i : ι), ⨅ (j : ι'), f i j ≤ ⨅ (j : ι'), ⨆ (i : ι), f i j

source

theorem biSup_mono {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {p : ι → Prop} {q : ι → Prop} (hpq : ∀ (i : ι), p i → q i) :

⨆ (i : ι), ⨆ (_ : p i), f i ≤ ⨆ (i : ι), ⨆ (_ : q i), f i

source

theorem biInf_mono {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {p : ι → Prop} {q : ι → Prop} (hpq : ∀ (i : ι), p i → q i) :

⨅ (i : ι), ⨅ (_ : q i), f i ≤ ⨅ (i : ι), ⨅ (_ : p i), f i

source

@[simp]

theorem iSup_le_iff {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {a : α} :

iSup f ≤ a ↔ ∀ (i : ι), f i ≤ a

source

@[simp]

theorem le_iInf_iff {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {a : α} :

a ≤ iInf f ↔ ∀ (i : ι), a ≤ f i

source

theorem iSup₂_le_iff {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] {a : α} {f : (i : ι) → κ i → α} :

⨆ (i : ι), ⨆ (j : κ i), f i j ≤ a ↔ ∀ (i : ι) (j : κ i), f i j ≤ a

source

theorem le_iInf₂_iff {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] {a : α} {f : (i : ι) → κ i → α} :

a ≤ ⨅ (i : ι), ⨅ (j : κ i), f i j ↔ ∀ (i : ι) (j : κ i), a ≤ f i j

source

theorem iSup_lt_iff {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {a : α} :

iSup f < a ↔ ∃ b < a, ∀ (i : ι), f i ≤ b

source

theorem lt_iInf_iff {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {a : α} :

a < iInf f ↔ ∃ (b : α), a < b ∧ ∀ (i : ι), b ≤ f i

source

theorem sSup_eq_iSup {α : Type u_1} [CompleteLattice α] {s : Set α} :

sSup s = ⨆ a ∈ s, a

source

theorem sInf_eq_iInf {α : Type u_1} [CompleteLattice α] {s : Set α} :

sInf s = ⨅ a ∈ s, a

source

theorem sSup_lowerBounds_eq_sInf {α : Type u_1} [CompleteLattice α] (s : Set α) :

sSup (lowerBounds s) = sInf s

source

theorem sInf_upperBounds_eq_csSup {α : Type u_1} [CompleteLattice α] (s : Set α) :

sInf (upperBounds s) = sSup s

source

theorem Monotone.le_map_iSup {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [CompleteLattice α] {s : ι → α} [CompleteLattice β] {f : α → β} (hf : Monotone f) :

⨆ (i : ι), f (s i) ≤ f (iSup s)

source

theorem Antitone.le_map_iInf {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [CompleteLattice α] {s : ι → α} [CompleteLattice β] {f : α → β} (hf : Antitone f) :

⨆ (i : ι), f (s i) ≤ f (iInf s)

source

theorem Monotone.le_map_iSup₂ {α : Type u_1} {β : Type u_2} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] [CompleteLattice β] {f : α → β} (hf : Monotone f) (s : (i : ι) → κ i → α) :

⨆ (i : ι), ⨆ (j : κ i), f (s i j) ≤ f (⨆ (i : ι), ⨆ (j : κ i), s i j)

source

theorem Antitone.le_map_iInf₂ {α : Type u_1} {β : Type u_2} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] [CompleteLattice β] {f : α → β} (hf : Antitone f) (s : (i : ι) → κ i → α) :

⨆ (i : ι), ⨆ (j : κ i), f (s i j) ≤ f (⨅ (i : ι), ⨅ (j : κ i), s i j)

source

theorem Monotone.le_map_sSup {α : Type u_1} {β : Type u_2} [CompleteLattice α] [CompleteLattice β] {s : Set α} {f : α → β} (hf : Monotone f) :

⨆ a ∈ s, f a ≤ f (sSup s)

source

theorem Antitone.le_map_sInf {α : Type u_1} {β : Type u_2} [CompleteLattice α] [CompleteLattice β] {s : Set α} {f : α → β} (hf : Antitone f) :

⨆ a ∈ s, f a ≤ f (sInf s)

source

theorem OrderIso.map_iSup {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [CompleteLattice α] [CompleteLattice β] (f : α ≃o β) (x : ι → α) :

f (⨆ (i : ι), x i) = ⨆ (i : ι), f (x i)

source

theorem OrderIso.map_iInf {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [CompleteLattice α] [CompleteLattice β] (f : α ≃o β) (x : ι → α) :

f (⨅ (i : ι), x i) = ⨅ (i : ι), f (x i)

source

theorem OrderIso.map_sSup {α : Type u_1} {β : Type u_2} [CompleteLattice α] [CompleteLattice β] (f : α ≃o β) (s : Set α) :

f (sSup s) = ⨆ a ∈ s, f a

source

theorem OrderIso.map_sInf {α : Type u_1} {β : Type u_2} [CompleteLattice α] [CompleteLattice β] (f : α ≃o β) (s : Set α) :

f (sInf s) = ⨅ a ∈ s, f a

source

theorem iSup_comp_le {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {ι' : Sort u_9} (f : ι' → α) (g : ι → ι') :

⨆ (x : ι), f (g x) ≤ ⨆ (y : ι'), f y

source

theorem le_iInf_comp {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {ι' : Sort u_9} (f : ι' → α) (g : ι → ι') :

⨅ (y : ι'), f y ≤ ⨅ (x : ι), f (g x)

source

theorem Monotone.iSup_comp_eq {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [CompleteLattice α] [Preorder β] {f : β → α} (hf : Monotone f) {s : ι → β} (hs : ∀ (x : β), ∃ (i : ι), x ≤ s i) :

⨆ (x : ι), f (s x) = ⨆ (y : β), f y

source

theorem Monotone.iInf_comp_eq {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [CompleteLattice α] [Preorder β] {f : β → α} (hf : Monotone f) {s : ι → β} (hs : ∀ (x : β), ∃ (i : ι), s i ≤ x) :

⨅ (x : ι), f (s x) = ⨅ (y : β), f y

source

theorem Antitone.map_iSup_le {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [CompleteLattice α] {s : ι → α} [CompleteLattice β] {f : α → β} (hf : Antitone f) :

f (iSup s) ≤ ⨅ (i : ι), f (s i)

source

theorem Monotone.map_iInf_le {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [CompleteLattice α] {s : ι → α} [CompleteLattice β] {f : α → β} (hf : Monotone f) :

f (iInf s) ≤ ⨅ (i : ι), f (s i)

source

theorem Antitone.map_iSup₂_le {α : Type u_1} {β : Type u_2} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] [CompleteLattice β] {f : α → β} (hf : Antitone f) (s : (i : ι) → κ i → α) :

f (⨆ (i : ι), ⨆ (j : κ i), s i j) ≤ ⨅ (i : ι), ⨅ (j : κ i), f (s i j)

source

theorem Monotone.map_iInf₂_le {α : Type u_1} {β : Type u_2} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] [CompleteLattice β] {f : α → β} (hf : Monotone f) (s : (i : ι) → κ i → α) :

f (⨅ (i : ι), ⨅ (j : κ i), s i j) ≤ ⨅ (i : ι), ⨅ (j : κ i), f (s i j)

source

theorem Antitone.map_sSup_le {α : Type u_1} {β : Type u_2} [CompleteLattice α] [CompleteLattice β] {s : Set α} {f : α → β} (hf : Antitone f) :

f (sSup s) ≤ ⨅ a ∈ s, f a

source

theorem Monotone.map_sInf_le {α : Type u_1} {β : Type u_2} [CompleteLattice α] [CompleteLattice β] {s : Set α} {f : α → β} (hf : Monotone f) :

f (sInf s) ≤ ⨅ a ∈ s, f a

source

theorem iSup_const_le {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {a : α} :

⨆ (x : ι), a ≤ a

source

theorem le_iInf_const {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {a : α} :

a ≤ ⨅ (x : ι), a

source

theorem iSup_const {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {a : α} [Nonempty ι] :

⨆ (x : ι), a = a

source

theorem iInf_const {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {a : α} [Nonempty ι] :

⨅ (x : ι), a = a

source

theorem iSup_unique {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] [Unique ι] (f : ι → α) :

⨆ (i : ι), f i = f default

source

theorem iInf_unique {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] [Unique ι] (f : ι → α) :

⨅ (i : ι), f i = f default

source

@[simp]

theorem iSup_bot {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] :

⨆ (x : ι), ⊥ = ⊥

source

@[simp]

theorem iInf_top {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] :

⨅ (x : ι), ⊤ = ⊤

source

@[simp]

theorem iSup_eq_bot {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {s : ι → α} :

iSup s = ⊥ ↔ ∀ (i : ι), s i = ⊥

source

@[simp]

theorem iInf_eq_top {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {s : ι → α} :

iInf s = ⊤ ↔ ∀ (i : ι), s i = ⊤

source

@[simp]

theorem bot_lt_iSup {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {s : ι → α} :

⊥ < ⨆ (i : ι), s i ↔ ∃ (i : ι), ⊥ < s i

source

@[simp]

theorem iInf_lt_top {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {s : ι → α} :

⨅ (i : ι), s i < ⊤ ↔ ∃ (i : ι), s i < ⊤

source

theorem iSup₂_eq_bot {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] {f : (i : ι) → κ i → α} :

⨆ (i : ι), ⨆ (j : κ i), f i j = ⊥ ↔ ∀ (i : ι) (j : κ i), f i j = ⊥

source

theorem iInf₂_eq_top {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLattice α] {f : (i : ι) → κ i → α} :

⨅ (i : ι), ⨅ (j : κ i), f i j = ⊤ ↔ ∀ (i : ι) (j : κ i), f i j = ⊤

source

@[simp]

theorem iSup_pos {α : Type u_1} [CompleteLattice α] {p : Prop} {f : p → α} (hp : p) :

⨆ (h : p), f h = f hp

source

@[simp]

theorem iInf_pos {α : Type u_1} [CompleteLattice α] {p : Prop} {f : p → α} (hp : p) :

⨅ (h : p), f h = f hp

source

@[simp]

theorem iSup_neg {α : Type u_1} [CompleteLattice α] {p : Prop} {f : p → α} (hp : ¬p) :

⨆ (h : p), f h = ⊥

source

@[simp]

theorem iInf_neg {α : Type u_1} [CompleteLattice α] {p : Prop} {f : p → α} (hp : ¬p) :

⨅ (h : p), f h = ⊤

source

theorem iSup_eq_of_forall_le_of_forall_lt_exists_gt {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {b : α} {f : ι → α} (h₁ : ∀ (i : ι), f i ≤ b) (h₂ : ∀ w < b, ∃ (i : ι), w < f i) :

⨆ (i : ι), f i = b

Introduction rule to prove that b is the supremum of f: it suffices to check that b is larger than f i for all i, and that this is not the case of any w<b. See ciSup_eq_of_forall_le_of_forall_lt_exists_gt for a version in conditionally complete lattices.

source

theorem iInf_eq_of_forall_ge_of_forall_gt_exists_lt {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {b : α} :

(∀ (i : ι), b ≤ f i) → (∀ (w : α), b < w → ∃ (i : ι), f i < w) → ⨅ (i : ι), f i = b

Introduction rule to prove that b is the infimum of f: it suffices to check that b is smaller than f i for all i, and that this is not the case of any w>b. See ciInf_eq_of_forall_ge_of_forall_gt_exists_lt for a version in conditionally complete lattices.

source

theorem iSup_eq_dif {α : Type u_1} [CompleteLattice α] {p : Prop} [Decidable p] (a : p → α) :

⨆ (h : p), a h = if h : p then a h else ⊥

source

theorem iSup_eq_if {α : Type u_1} [CompleteLattice α] {p : Prop} [Decidable p] (a : α) :

⨆ (_ : p), a = if p then a else ⊥

source

theorem iInf_eq_dif {α : Type u_1} [CompleteLattice α] {p : Prop} [Decidable p] (a : p → α) :

⨅ (h : p), a h = if h : p then a h else ⊤

source

theorem iInf_eq_if {α : Type u_1} [CompleteLattice α] {p : Prop} [Decidable p] (a : α) :

⨅ (_ : p), a = if p then a else ⊤

source

theorem iSup_comm {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [CompleteLattice α] {f : ι → ι' → α} :

⨆ (i : ι), ⨆ (j : ι'), f i j = ⨆ (j : ι'), ⨆ (i : ι), f i j

source

theorem iInf_comm {α : Type u_1} {ι : Sort u_5} {ι' : Sort u_6} [CompleteLattice α] {f : ι → ι' → α} :

⨅ (i : ι), ⨅ (j : ι'), f i j = ⨅ (j : ι'), ⨅ (i : ι), f i j

source

theorem iSup₂_comm {α : Type u_1} [CompleteLattice α] {ι₁ : Sort u_9} {ι₂ : Sort u_10} {κ₁ : ι₁ → Sort u_11} {κ₂ : ι₂ → Sort u_12} (f : (i₁ : ι₁) → κ₁ i₁ → (i₂ : ι₂) → κ₂ i₂ → α) :

⨆ (i₁ : ι₁), ⨆ (j₁ : κ₁ i₁), ⨆ (i₂ : ι₂), ⨆ (j₂ : κ₂ i₂), f i₁ j₁ i₂ j₂ = ⨆ (i₂ : ι₂), ⨆ (j₂ : κ₂ i₂), ⨆ (i₁ : ι₁), ⨆ (j₁ : κ₁ i₁), f i₁ j₁ i₂ j₂

source

theorem iInf₂_comm {α : Type u_1} [CompleteLattice α] {ι₁ : Sort u_9} {ι₂ : Sort u_10} {κ₁ : ι₁ → Sort u_11} {κ₂ : ι₂ → Sort u_12} (f : (i₁ : ι₁) → κ₁ i₁ → (i₂ : ι₂) → κ₂ i₂ → α) :

⨅ (i₁ : ι₁), ⨅ (j₁ : κ₁ i₁), ⨅ (i₂ : ι₂), ⨅ (j₂ : κ₂ i₂), f i₁ j₁ i₂ j₂ = ⨅ (i₂ : ι₂), ⨅ (j₂ : κ₂ i₂), ⨅ (i₁ : ι₁), ⨅ (j₁ : κ₁ i₁), f i₁ j₁ i₂ j₂

source

@[simp]

theorem iSup_iSup_eq_left {α : Type u_1} {β : Type u_2} [CompleteLattice α] {b : β} {f : (x : β) → x = b → α} :

⨆ (x : β), ⨆ (h : x = b), f x h = f b ⋯

source

@[simp]

theorem iInf_iInf_eq_left {α : Type u_1} {β : Type u_2} [CompleteLattice α] {b : β} {f : (x : β) → x = b → α} :

⨅ (x : β), ⨅ (h : x = b), f x h = f b ⋯

source

@[simp]

theorem iSup_iSup_eq_right {α : Type u_1} {β : Type u_2} [CompleteLattice α] {b : β} {f : (x : β) → b = x → α} :

⨆ (x : β), ⨆ (h : b = x), f x h = f b ⋯

source

@[simp]

theorem iInf_iInf_eq_right {α : Type u_1} {β : Type u_2} [CompleteLattice α] {b : β} {f : (x : β) → b = x → α} :

⨅ (x : β), ⨅ (h : b = x), f x h = f b ⋯

source

theorem iSup_subtype {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {p : ι → Prop} {f : Subtype p → α} :

iSup f = ⨆ (i : ι), ⨆ (h : p i), f ⟨i, h⟩

source

theorem iInf_subtype {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {p : ι → Prop} {f : Subtype p → α} :

iInf f = ⨅ (i : ι), ⨅ (h : p i), f ⟨i, h⟩

source

theorem iSup_subtype' {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {p : ι → Prop} {f : (i : ι) → p i → α} :

⨆ (i : ι), ⨆ (h : p i), f i h = ⨆ (x : Subtype p), f ↑x ⋯

source

theorem iInf_subtype' {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {p : ι → Prop} {f : (i : ι) → p i → α} :

⨅ (i : ι), ⨅ (h : p i), f i h = ⨅ (x : Subtype p), f ↑x ⋯

source

theorem iSup_subtype'' {α : Type u_1} [CompleteLattice α] {ι : Type u_9} (s : Set ι) (f : ι → α) :

⨆ (i : ↑s), f ↑i = ⨆ t ∈ s, f t

source

theorem iInf_subtype'' {α : Type u_1} [CompleteLattice α] {ι : Type u_9} (s : Set ι) (f : ι → α) :

⨅ (i : ↑s), f ↑i = ⨅ t ∈ s, f t

source

theorem biSup_const {α : Type u_1} [CompleteLattice α] {ι : Type u_9} {a : α} {s : Set ι} (hs : s.Nonempty) :

⨆ i ∈ s, a = a

source

theorem biInf_const {α : Type u_1} [CompleteLattice α] {ι : Type u_9} {a : α} {s : Set ι} (hs : s.Nonempty) :

⨅ i ∈ s, a = a

source

theorem iSup_sup_eq {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {g : ι → α} :

⨆ (x : ι), f x ⊔ g x = (⨆ (x : ι), f x) ⊔ ⨆ (x : ι), g x

source

theorem iInf_inf_eq {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {f : ι → α} {g : ι → α} :

⨅ (x : ι), f x ⊓ g x = (⨅ (x : ι), f x) ⊓ ⨅ (x : ι), g x

source

theorem Equiv.biSup_comp {α : Type u_1} [CompleteLattice α] {ι : Type u_9} {ι' : Type u_10} {g : ι' → α} (e : ι ≃ ι') (s : Set ι') :

⨆ i ∈ ⇑e.symm '' s, g (e i) = ⨆ i ∈ s, g i

source

theorem Equiv.biInf_comp {α : Type u_1} [CompleteLattice α] {ι : Type u_9} {ι' : Type u_10} {g : ι' → α} (e : ι ≃ ι') (s : Set ι') :

⨅ i ∈ ⇑e.symm '' s, g (e i) = ⨅ i ∈ s, g i

source

theorem biInf_le {α : Type u_1} [CompleteLattice α] {ι : Type u_9} {s : Set ι} (f : ι → α) {i : ι} (hi : i ∈ s) :

⨅ i ∈ s, f i ≤ f i

source

theorem le_biSup {α : Type u_1} [CompleteLattice α] {ι : Type u_9} {s : Set ι} (f : ι → α) {i : ι} (hi : i ∈ s) :

f i ≤ ⨆ i ∈ s, f i

source

theorem iSup_sup {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] [Nonempty ι] {f : ι → α} {a : α} :

(⨆ (x : ι), f x) ⊔ a = ⨆ (x : ι), f x ⊔ a

source

theorem iInf_inf {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] [Nonempty ι] {f : ι → α} {a : α} :

(⨅ (x : ι), f x) ⊓ a = ⨅ (x : ι), f x ⊓ a

source

theorem sup_iSup {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] [Nonempty ι] {f : ι → α} {a : α} :

a ⊔ ⨆ (x : ι), f x = ⨆ (x : ι), a ⊔ f x

source

theorem inf_iInf {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] [Nonempty ι] {f : ι → α} {a : α} :

a ⊓ ⨅ (x : ι), f x = ⨅ (x : ι), a ⊓ f x

source

theorem biSup_sup {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {p : ι → Prop} {f : (i : ι) → p i → α} {a : α} (h : ∃ (i : ι), p i) :

(⨆ (i : ι), ⨆ (h : p i), f i h) ⊔ a = ⨆ (i : ι), ⨆ (h : p i), f i h ⊔ a

source

theorem sup_biSup {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {p : ι → Prop} {f : (i : ι) → p i → α} {a : α} (h : ∃ (i : ι), p i) :

a ⊔ ⨆ (i : ι), ⨆ (h : p i), f i h = ⨆ (i : ι), ⨆ (h : p i), a ⊔ f i h

source

theorem biInf_inf {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {p : ι → Prop} {f : (i : ι) → p i → α} {a : α} (h : ∃ (i : ι), p i) :

(⨅ (i : ι), ⨅ (h : p i), f i h) ⊓ a = ⨅ (i : ι), ⨅ (h : p i), f i h ⊓ a

source

theorem inf_biInf {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {p : ι → Prop} {f : (i : ι) → p i → α} {a : α} (h : ∃ (i : ι), p i) :

a ⊓ ⨅ (i : ι), ⨅ (h : p i), f i h = ⨅ (i : ι), ⨅ (h : p i), a ⊓ f i h

`iSup` and `iInf` under `Prop` #

source

theorem iSup_false {α : Type u_1} [CompleteLattice α] {s : False → α} :

iSup s = ⊥

source

theorem iInf_false {α : Type u_1} [CompleteLattice α] {s : False → α} :

iInf s = ⊤

source

theorem iSup_true {α : Type u_1} [CompleteLattice α] {s : True → α} :

iSup s = s trivial

source

theorem iInf_true {α : Type u_1} [CompleteLattice α] {s : True → α} :

iInf s = s trivial

source

@[simp]

theorem iSup_exists {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {p : ι → Prop} {f : Exists p → α} :

⨆ (x : Exists p), f x = ⨆ (i : ι), ⨆ (h : p i), f ⋯

source

@[simp]

theorem iInf_exists {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] {p : ι → Prop} {f : Exists p → α} :

⨅ (x : Exists p), f x = ⨅ (i : ι), ⨅ (h : p i), f ⋯

source

theorem iSup_and {α : Type u_1} [CompleteLattice α] {p : Prop} {q : Prop} {s : p ∧ q → α} :

iSup s = ⨆ (h₁ : p), ⨆ (h₂ : q), s ⋯

source

theorem iInf_and {α : Type u_1} [CompleteLattice α] {p : Prop} {q : Prop} {s : p ∧ q → α} :

iInf s = ⨅ (h₁ : p), ⨅ (h₂ : q), s ⋯

source

theorem iSup_and' {α : Type u_1} [CompleteLattice α] {p : Prop} {q : Prop} {s : p → q → α} :

⨆ (h₁ : p), ⨆ (h₂ : q), s h₁ h₂ = ⨆ (h : p ∧ q), s ⋯ ⋯

The symmetric case of iSup_and, useful for rewriting into a supremum over a conjunction

source

theorem iInf_and' {α : Type u_1} [CompleteLattice α] {p : Prop} {q : Prop} {s : p → q → α} :

⨅ (h₁ : p), ⨅ (h₂ : q), s h₁ h₂ = ⨅ (h : p ∧ q), s ⋯ ⋯

The symmetric case of iInf_and, useful for rewriting into an infimum over a conjunction

source

theorem iSup_or {α : Type u_1} [CompleteLattice α] {p : Prop} {q : Prop} {s : p ∨ q → α} :

⨆ (x : p ∨ q), s x = (⨆ (i : p), s ⋯) ⊔ ⨆ (j : q), s ⋯

source

theorem iInf_or {α : Type u_1} [CompleteLattice α] {p : Prop} {q : Prop} {s : p ∨ q → α} :

⨅ (x : p ∨ q), s x = (⨅ (i : p), s ⋯) ⊓ ⨅ (j : q), s ⋯

source

theorem iSup_dite {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (p : ι → Prop) [DecidablePred p] (f : (i : ι) → p i → α) (g : (i : ι) → ¬p i → α) :

(⨆ (i : ι), if h : p i then f i h else g i h) = (⨆ (i : ι), ⨆ (h : p i), f i h) ⊔ ⨆ (i : ι), ⨆ (h : ¬p i), g i h

source

theorem iInf_dite {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (p : ι → Prop) [DecidablePred p] (f : (i : ι) → p i → α) (g : (i : ι) → ¬p i → α) :

(⨅ (i : ι), if h : p i then f i h else g i h) = (⨅ (i : ι), ⨅ (h : p i), f i h) ⊓ ⨅ (i : ι), ⨅ (h : ¬p i), g i h

source

theorem iSup_ite {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (p : ι → Prop) [DecidablePred p] (f : ι → α) (g : ι → α) :

(⨆ (i : ι), if p i then f i else g i) = (⨆ (i : ι), ⨆ (_ : p i), f i) ⊔ ⨆ (i : ι), ⨆ (_ : ¬p i), g i

source

theorem iInf_ite {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (p : ι → Prop) [DecidablePred p] (f : ι → α) (g : ι → α) :

(⨅ (i : ι), if p i then f i else g i) = (⨅ (i : ι), ⨅ (_ : p i), f i) ⊓ ⨅ (i : ι), ⨅ (_ : ¬p i), g i

source

theorem iSup_range {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [CompleteLattice α] {g : β → α} {f : ι → β} :

⨆ b ∈ Set.range f, g b = ⨆ (i : ι), g (f i)

source

theorem iInf_range {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [CompleteLattice α] {g : β → α} {f : ι → β} :

⨅ b ∈ Set.range f, g b = ⨅ (i : ι), g (f i)

source

theorem sSup_image {α : Type u_1} {β : Type u_2} [CompleteLattice α] {s : Set β} {f : β → α} :

sSup (f '' s) = ⨆ a ∈ s, f a

source

theorem sInf_image {α : Type u_1} {β : Type u_2} [CompleteLattice α] {s : Set β} {f : β → α} :

sInf (f '' s) = ⨅ a ∈ s, f a

source

theorem OrderIso.map_sSup_eq_sSup_symm_preimage {α : Type u_1} {β : Type u_2} [CompleteLattice α] [CompleteLattice β] (f : α ≃o β) (s : Set α) :

f (sSup s) = sSup (⇑f.symm ⁻¹' s)

source

theorem OrderIso.map_sInf_eq_sInf_symm_preimage {α : Type u_1} {β : Type u_2} [CompleteLattice α] [CompleteLattice β] (f : α ≃o β) (s : Set α) :

f (sInf s) = sInf (⇑f.symm ⁻¹' s)

source

theorem iSup_emptyset {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} :

⨆ x ∈ ∅, f x = ⊥

source

theorem iInf_emptyset {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} :

⨅ x ∈ ∅, f x = ⊤

source

theorem iSup_univ {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} :

⨆ x ∈ Set.univ, f x = ⨆ (x : β), f x

source

theorem iInf_univ {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} :

⨅ x ∈ Set.univ, f x = ⨅ (x : β), f x

source

theorem iSup_union {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} {s : Set β} {t : Set β} :

⨆ x ∈ s ∪ t, f x = (⨆ x ∈ s, f x) ⊔ ⨆ x ∈ t, f x

source

theorem iInf_union {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} {s : Set β} {t : Set β} :

⨅ x ∈ s ∪ t, f x = (⨅ x ∈ s, f x) ⊓ ⨅ x ∈ t, f x

source

theorem iSup_split {α : Type u_1} {β : Type u_2} [CompleteLattice α] (f : β → α) (p : β → Prop) :

⨆ (i : β), f i = (⨆ (i : β), ⨆ (_ : p i), f i) ⊔ ⨆ (i : β), ⨆ (_ : ¬p i), f i

source

theorem iInf_split {α : Type u_1} {β : Type u_2} [CompleteLattice α] (f : β → α) (p : β → Prop) :

⨅ (i : β), f i = (⨅ (i : β), ⨅ (_ : p i), f i) ⊓ ⨅ (i : β), ⨅ (_ : ¬p i), f i

source

theorem iSup_split_single {α : Type u_1} {β : Type u_2} [CompleteLattice α] (f : β → α) (i₀ : β) :

⨆ (i : β), f i = f i₀ ⊔ ⨆ (i : β), ⨆ (_ : i ≠ i₀), f i

source

theorem iInf_split_single {α : Type u_1} {β : Type u_2} [CompleteLattice α] (f : β → α) (i₀ : β) :

⨅ (i : β), f i = f i₀ ⊓ ⨅ (i : β), ⨅ (_ : i ≠ i₀), f i

source

theorem iSup_le_iSup_of_subset {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} {s : Set β} {t : Set β} :

s ⊆ t → ⨆ x ∈ s, f x ≤ ⨆ x ∈ t, f x

source

theorem iInf_le_iInf_of_subset {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} {s : Set β} {t : Set β} :

s ⊆ t → ⨅ x ∈ t, f x ≤ ⨅ x ∈ s, f x

source

theorem iSup_insert {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} {s : Set β} {b : β} :

⨆ x ∈ insert b s, f x = f b ⊔ ⨆ x ∈ s, f x

source

theorem iInf_insert {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} {s : Set β} {b : β} :

⨅ x ∈ insert b s, f x = f b ⊓ ⨅ x ∈ s, f x

source

theorem iSup_singleton {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} {b : β} :

⨆ x ∈ {b}, f x = f b

source

theorem iInf_singleton {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} {b : β} :

⨅ x ∈ {b}, f x = f b

source

theorem iSup_pair {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} {a : β} {b : β} :

⨆ x ∈ {a, b}, f x = f a ⊔ f b

source

theorem iInf_pair {α : Type u_1} {β : Type u_2} [CompleteLattice α] {f : β → α} {a : β} {b : β} :

⨅ x ∈ {a, b}, f x = f a ⊓ f b

source

theorem iSup_image {α : Type u_1} {β : Type u_2} [CompleteLattice α] {γ : Type u_9} {f : β → γ} {g : γ → α} {t : Set β} :

⨆ c ∈ f '' t, g c = ⨆ b ∈ t, g (f b)

source

theorem iInf_image {α : Type u_1} {β : Type u_2} [CompleteLattice α] {γ : Type u_9} {f : β → γ} {g : γ → α} {t : Set β} :

⨅ c ∈ f '' t, g c = ⨅ b ∈ t, g (f b)

source

theorem iSup_extend_bot {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [CompleteLattice α] {e : ι → β} (he : Function.Injective e) (f : ι → α) :

⨆ (j : β), Function.extend e f ⊥ j = ⨆ (i : ι), f i

source

theorem iInf_extend_top {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [CompleteLattice α] {e : ι → β} (he : Function.Injective e) (f : ι → α) :

⨅ (j : β), Function.extend e f ⊤ j = iInf f

`iSup` and `iInf` under `Type` #

source

theorem iSup_of_empty' {α : Type u_9} {ι : Sort u_10} [SupSet α] [IsEmpty ι] (f : ι → α) :

iSup f = sSup ∅

source

theorem iInf_of_isEmpty {α : Type u_9} {ι : Sort u_10} [InfSet α] [IsEmpty ι] (f : ι → α) :

iInf f = sInf ∅

source

theorem iSup_of_empty {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] [IsEmpty ι] (f : ι → α) :

iSup f = ⊥

source

theorem iInf_of_empty {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] [IsEmpty ι] (f : ι → α) :

iInf f = ⊤

source

theorem iSup_bool_eq {α : Type u_1} [CompleteLattice α] {f : Bool → α} :

⨆ (b : Bool), f b = f true ⊔ f false

source

theorem iInf_bool_eq {α : Type u_1} [CompleteLattice α] {f : Bool → α} :

⨅ (b : Bool), f b = f true ⊓ f false

source

theorem sup_eq_iSup {α : Type u_1} [CompleteLattice α] (x : α) (y : α) :

x ⊔ y = ⨆ (b : Bool), bif b then x else y

source

theorem inf_eq_iInf {α : Type u_1} [CompleteLattice α] (x : α) (y : α) :

x ⊓ y = ⨅ (b : Bool), bif b then x else y

source

theorem isGLB_biInf {α : Type u_1} {β : Type u_2} [CompleteLattice α] {s : Set β} {f : β → α} :

IsGLB (f '' s) (⨅ x ∈ s, f x)

source

theorem isLUB_biSup {α : Type u_1} {β : Type u_2} [CompleteLattice α] {s : Set β} {f : β → α} :

IsLUB (f '' s) (⨆ x ∈ s, f x)

source

theorem iSup_sigma {α : Type u_1} {β : Type u_2} [CompleteLattice α] {p : β → Type u_9} {f : Sigma p → α} :

⨆ (x : Sigma p), f x = ⨆ (i : β), ⨆ (j : p i), f ⟨i, j⟩

source

theorem iInf_sigma {α : Type u_1} {β : Type u_2} [CompleteLattice α] {p : β → Type u_9} {f : Sigma p → α} :

⨅ (x : Sigma p), f x = ⨅ (i : β), ⨅ (j : p i), f ⟨i, j⟩

source

theorem iSup_sigma' {α : Type u_1} {β : Type u_2} [CompleteLattice α] {κ : β → Type u_9} (f : (i : β) → κ i → α) :

⨆ (i : β), ⨆ (j : κ i), f i j = ⨆ (x : (i : β) × κ i), f x.fst x.snd

source

theorem iInf_sigma' {α : Type u_1} {β : Type u_2} [CompleteLattice α] {κ : β → Type u_9} (f : (i : β) → κ i → α) :

⨅ (i : β), ⨅ (j : κ i), f i j = ⨅ (x : (i : β) × κ i), f x.fst x.snd

source

theorem iSup_psigma {α : Type u_1} [CompleteLattice α] {ι : Sort u_9} {κ : ι → Sort u_10} (f : (i : ι) ×' κ i → α) :

⨆ (ij : (i : ι) ×' κ i), f ij = ⨆ (i : ι), ⨆ (j : κ i), f ⟨i, j⟩

source

theorem iInf_psigma {α : Type u_1} [CompleteLattice α] {ι : Sort u_9} {κ : ι → Sort u_10} (f : (i : ι) ×' κ i → α) :

⨅ (ij : (i : ι) ×' κ i), f ij = ⨅ (i : ι), ⨅ (j : κ i), f ⟨i, j⟩

source

theorem iSup_psigma' {α : Type u_1} [CompleteLattice α] {ι : Sort u_9} {κ : ι → Sort u_10} (f : (i : ι) → κ i → α) :

⨆ (i : ι), ⨆ (j : κ i), f i j = ⨆ (ij : (i : ι) ×' κ i), f ij.fst ij.snd

source

theorem iInf_psigma' {α : Type u_1} [CompleteLattice α] {ι : Sort u_9} {κ : ι → Sort u_10} (f : (i : ι) → κ i → α) :

⨅ (i : ι), ⨅ (j : κ i), f i j = ⨅ (ij : (i : ι) ×' κ i), f ij.fst ij.snd

source

theorem iSup_prod {α : Type u_1} {β : Type u_2} {γ : Type u_4} [CompleteLattice α] {f : β × γ → α} :

⨆ (x : β × γ), f x = ⨆ (i : β), ⨆ (j : γ), f (i, j)

source

theorem iInf_prod {α : Type u_1} {β : Type u_2} {γ : Type u_4} [CompleteLattice α] {f : β × γ → α} :

⨅ (x : β × γ), f x = ⨅ (i : β), ⨅ (j : γ), f (i, j)

source

theorem iSup_prod' {α : Type u_1} {β : Type u_2} {γ : Type u_4} [CompleteLattice α] (f : β → γ → α) :

⨆ (i : β), ⨆ (j : γ), f i j = ⨆ (x : β × γ), f x.1 x.2

source

theorem iInf_prod' {α : Type u_1} {β : Type u_2} {γ : Type u_4} [CompleteLattice α] (f : β → γ → α) :

⨅ (i : β), ⨅ (j : γ), f i j = ⨅ (x : β × γ), f x.1 x.2

source

theorem biSup_prod {α : Type u_1} {β : Type u_2} {γ : Type u_4} [CompleteLattice α] {f : β × γ → α} {s : Set β} {t : Set γ} :

⨆ x ∈ s ×ˢ t, f x = ⨆ a ∈ s, ⨆ b ∈ t, f (a, b)

source

theorem biInf_prod {α : Type u_1} {β : Type u_2} {γ : Type u_4} [CompleteLattice α] {f : β × γ → α} {s : Set β} {t : Set γ} :

⨅ x ∈ s ×ˢ t, f x = ⨅ a ∈ s, ⨅ b ∈ t, f (a, b)

source

theorem iSup_sum {α : Type u_1} {β : Type u_2} {γ : Type u_4} [CompleteLattice α] {f : β ⊕ γ → α} :

⨆ (x : β ⊕ γ), f x = (⨆ (i : β), f (Sum.inl i)) ⊔ ⨆ (j : γ), f (Sum.inr j)

source

theorem iInf_sum {α : Type u_1} {β : Type u_2} {γ : Type u_4} [CompleteLattice α] {f : β ⊕ γ → α} :

⨅ (x : β ⊕ γ), f x = (⨅ (i : β), f (Sum.inl i)) ⊓ ⨅ (j : γ), f (Sum.inr j)

source

theorem iSup_option {α : Type u_1} {β : Type u_2} [CompleteLattice α] (f : Option β → α) :

⨆ (o : Option β), f o = f none ⊔ ⨆ (b : β), f (some b)

source

theorem iInf_option {α : Type u_1} {β : Type u_2} [CompleteLattice α] (f : Option β → α) :

⨅ (o : Option β), f o = f none ⊓ ⨅ (b : β), f (some b)

source

theorem iSup_option_elim {α : Type u_1} {β : Type u_2} [CompleteLattice α] (a : α) (f : β → α) :

⨆ (o : Option β), o.elim a f = a ⊔ ⨆ (b : β), f b

A version of iSup_option useful for rewriting right-to-left.

source

theorem iInf_option_elim {α : Type u_1} {β : Type u_2} [CompleteLattice α] (a : α) (f : β → α) :

⨅ (o : Option β), o.elim a f = a ⊓ ⨅ (b : β), f b

A version of iInf_option useful for rewriting right-to-left.

source

@[simp]

theorem iSup_ne_bot_subtype {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (f : ι → α) :

⨆ (i : { i : ι // f i ≠ ⊥ }), f ↑i = ⨆ (i : ι), f i

When taking the supremum of f : ι → α, the elements of ι on which f gives ⊥ can be dropped, without changing the result.

source

theorem iInf_ne_top_subtype {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (f : ι → α) :

⨅ (i : { i : ι // f i ≠ ⊤ }), f ↑i = ⨅ (i : ι), f i

When taking the infimum of f : ι → α, the elements of ι on which f gives ⊤ can be dropped, without changing the result.

source

theorem sSup_image2 {α : Type u_1} {β : Type u_2} {γ : Type u_4} [CompleteLattice α] {f : β → γ → α} {s : Set β} {t : Set γ} :

sSup (Set.image2 f s t) = ⨆ a ∈ s, ⨆ b ∈ t, f a b

source

theorem sInf_image2 {α : Type u_1} {β : Type u_2} {γ : Type u_4} [CompleteLattice α] {f : β → γ → α} {s : Set β} {t : Set γ} :

sInf (Set.image2 f s t) = ⨅ a ∈ s, ⨅ b ∈ t, f a b

`iSup` and `iInf` under `ℕ` #

source

theorem iSup_ge_eq_iSup_nat_add {α : Type u_1} [CompleteLattice α] (u : ℕ → α) (n : ℕ) :

⨆ (i : ℕ), ⨆ (_ : i ≥ n), u i = ⨆ (i : ℕ), u (i + n)

source

theorem iInf_ge_eq_iInf_nat_add {α : Type u_1} [CompleteLattice α] (u : ℕ → α) (n : ℕ) :

⨅ (i : ℕ), ⨅ (_ : i ≥ n), u i = ⨅ (i : ℕ), u (i + n)

source

theorem Monotone.iSup_nat_add {α : Type u_1} [CompleteLattice α] {f : ℕ → α} (hf : Monotone f) (k : ℕ) :

⨆ (n : ℕ), f (n + k) = ⨆ (n : ℕ), f n

source

theorem Antitone.iInf_nat_add {α : Type u_1} [CompleteLattice α] {f : ℕ → α} (hf : Antitone f) (k : ℕ) :

⨅ (n : ℕ), f (n + k) = ⨅ (n : ℕ), f n

source

theorem iSup_iInf_ge_nat_add {α : Type u_1} [CompleteLattice α] (f : ℕ → α) (k : ℕ) :

⨆ (n : ℕ), ⨅ (i : ℕ), ⨅ (_ : i ≥ n), f (i + k) = ⨆ (n : ℕ), ⨅ (i : ℕ), ⨅ (_ : i ≥ n), f i

source

theorem iInf_iSup_ge_nat_add {α : Type u_1} [CompleteLattice α] (f : ℕ → α) (k : ℕ) :

⨅ (n : ℕ), ⨆ (i : ℕ), ⨆ (_ : i ≥ n), f (i + k) = ⨅ (n : ℕ), ⨆ (i : ℕ), ⨆ (_ : i ≥ n), f i

source

theorem sup_iSup_nat_succ {α : Type u_1} [CompleteLattice α] (u : ℕ → α) :

u 0 ⊔ ⨆ (i : ℕ), u (i + 1) = ⨆ (i : ℕ), u i

source

theorem inf_iInf_nat_succ {α : Type u_1} [CompleteLattice α] (u : ℕ → α) :

u 0 ⊓ ⨅ (i : ℕ), u (i + 1) = ⨅ (i : ℕ), u i

source

theorem iInf_nat_gt_zero_eq {α : Type u_1} [CompleteLattice α] (f : ℕ → α) :

⨅ (i : ℕ), ⨅ (_ : i > 0), f i = ⨅ (i : ℕ), f (i + 1)

source

theorem iSup_nat_gt_zero_eq {α : Type u_1} [CompleteLattice α] (f : ℕ → α) :

⨆ (i : ℕ), ⨆ (_ : i > 0), f i = ⨆ (i : ℕ), f (i + 1)

source

theorem iSup_eq_top {α : Type u_1} {ι : Sort u_5} [CompleteLinearOrder α] (f : ι → α) :

iSup f = ⊤ ↔ ∀ b < ⊤, ∃ (i : ι), b < f i

source

theorem iInf_eq_bot {α : Type u_1} {ι : Sort u_5} [CompleteLinearOrder α] (f : ι → α) :

iInf f = ⊥ ↔ ∀ b > ⊥, ∃ (i : ι), f i < b

source

theorem iSup₂_eq_top {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLinearOrder α] (f : (i : ι) → κ i → α) :

⨆ (i : ι), ⨆ (j : κ i), f i j = ⊤ ↔ ∀ b < ⊤, ∃ (i : ι) (j : κ i), b < f i j

source

theorem iInf₂_eq_bot {α : Type u_1} {ι : Sort u_5} {κ : ι → Sort u_7} [CompleteLinearOrder α] (f : (i : ι) → κ i → α) :

⨅ (i : ι), ⨅ (j : κ i), f i j = ⊥ ↔ ∀ b > ⊥, ∃ (i : ι) (j : κ i), f i j < b

Instances #

source

instance Prop.instCompleteLattice :

CompleteLattice Prop

Equations

Prop.instCompleteLattice = CompleteLattice.mk Prop.instCompleteLattice.proof_1 Prop.instCompleteLattice.proof_2 ⋯ ⋯ Prop.instCompleteLattice.proof_3 Prop.instCompleteLattice.proof_4

source

noncomputable instance Prop.instCompleteLinearOrder :

CompleteLinearOrder Prop

Equations

One or more equations did not get rendered due to their size.

source

@[simp]

theorem sSup_Prop_eq {s : Set Prop} :

sSup s = ∃ p ∈ s, p

source

@[simp]

theorem sInf_Prop_eq {s : Set Prop} :

sInf s = ∀ p ∈ s, p

source

@[simp]

theorem iSup_Prop_eq {ι : Sort u_5} {p : ι → Prop} :

⨆ (i : ι), p i = ∃ (i : ι), p i

source

@[simp]

theorem iInf_Prop_eq {ι : Sort u_5} {p : ι → Prop} :

⨅ (i : ι), p i = ∀ (i : ι), p i

source

instance Pi.supSet {α : Type u_9} {β : α → Type u_10} [(i : α) → SupSet (β i)] :

SupSet ((i : α) → β i)

Equations

Pi.supSet = { sSup := fun (s : Set ((i : α) → β i)) (i : α) => ⨆ (f : ↑s), ↑f i }

source

instance Pi.infSet {α : Type u_9} {β : α → Type u_10} [(i : α) → InfSet (β i)] :

InfSet ((i : α) → β i)

Equations

Pi.infSet = { sInf := fun (s : Set ((i : α) → β i)) (i : α) => ⨅ (f : ↑s), ↑f i }

source

instance Pi.instCompleteLattice {α : Type u_9} {β : α → Type u_10} [(i : α) → CompleteLattice (β i)] :

CompleteLattice ((i : α) → β i)

Equations

Pi.instCompleteLattice = CompleteLattice.mk ⋯ ⋯ ⋯ ⋯ ⋯ ⋯

source

@[simp]

theorem sSup_apply {α : Type u_9} {β : α → Type u_10} [(i : α) → SupSet (β i)] {s : Set ((a : α) → β a)} {a : α} :

sSup s a = ⨆ (f : ↑s), ↑f a

source

@[simp]

theorem sInf_apply {α : Type u_9} {β : α → Type u_10} [(i : α) → InfSet (β i)] {s : Set ((a : α) → β a)} {a : α} :

sInf s a = ⨅ (f : ↑s), ↑f a

source

@[simp]

theorem iSup_apply {α : Type u_9} {β : α → Type u_10} {ι : Sort u_11} [(i : α) → SupSet (β i)] {f : ι → (a : α) → β a} {a : α} :

(⨆ (i : ι), f i) a = ⨆ (i : ι), f i a

source

@[simp]

theorem iInf_apply {α : Type u_9} {β : α → Type u_10} {ι : Sort u_11} [(i : α) → InfSet (β i)] {f : ι → (a : α) → β a} {a : α} :

(⨅ (i : ι), f i) a = ⨅ (i : ι), f i a

source

theorem unary_relation_sSup_iff {α : Type u_9} (s : Set (α → Prop)) {a : α} :

sSup s a ↔ ∃ r ∈ s, r a

source

theorem unary_relation_sInf_iff {α : Type u_9} (s : Set (α → Prop)) {a : α} :

sInf s a ↔ ∀ r ∈ s, r a

source

theorem binary_relation_sSup_iff {α : Type u_9} {β : Type u_10} (s : Set (α → β → Prop)) {a : α} {b : β} :

sSup s a b ↔ ∃ r ∈ s, r a b

source

theorem binary_relation_sInf_iff {α : Type u_9} {β : Type u_10} (s : Set (α → β → Prop)) {a : α} {b : β} :

sInf s a b ↔ ∀ r ∈ s, r a b

source

theorem Monotone.sSup {α : Type u_1} {β : Type u_2} [Preorder α] [CompleteLattice β] {s : Set (α → β)} (hs : ∀ f ∈ s, Monotone f) :

Monotone (sSup s)

source

theorem Monotone.sInf {α : Type u_1} {β : Type u_2} [Preorder α] [CompleteLattice β] {s : Set (α → β)} (hs : ∀ f ∈ s, Monotone f) :

Monotone (sInf s)

source

theorem Antitone.sSup {α : Type u_1} {β : Type u_2} [Preorder α] [CompleteLattice β] {s : Set (α → β)} (hs : ∀ f ∈ s, Antitone f) :

Antitone (sSup s)

source

theorem Antitone.sInf {α : Type u_1} {β : Type u_2} [Preorder α] [CompleteLattice β] {s : Set (α → β)} (hs : ∀ f ∈ s, Antitone f) :

Antitone (sInf s)

source

@[deprecated Monotone.sSup]

theorem monotone_sSup_of_monotone {α : Type u_1} {β : Type u_2} [Preorder α] [CompleteLattice β] {s : Set (α → β)} (hs : ∀ f ∈ s, Monotone f) :

Monotone (sSup s)

Alias of Monotone.sSup.

source

@[deprecated Monotone.sInf]

theorem monotone_sInf_of_monotone {α : Type u_1} {β : Type u_2} [Preorder α] [CompleteLattice β] {s : Set (α → β)} (hs : ∀ f ∈ s, Monotone f) :

Monotone (sInf s)

Alias of Monotone.sInf.

source

theorem Monotone.iSup {α : Type u_1} {β : Type u_2} {ι : Sort u_9} [Preorder α] [CompleteLattice β] {f : ι → α → β} (hf : ∀ (i : ι), Monotone (f i)) :

Monotone (⨆ (i : ι), f i)

source

theorem Monotone.iInf {α : Type u_1} {β : Type u_2} {ι : Sort u_9} [Preorder α] [CompleteLattice β] {f : ι → α → β} (hf : ∀ (i : ι), Monotone (f i)) :

Monotone (⨅ (i : ι), f i)

source

theorem Antitone.iSup {α : Type u_1} {β : Type u_2} {ι : Sort u_9} [Preorder α] [CompleteLattice β] {f : ι → α → β} (hf : ∀ (i : ι), Antitone (f i)) :

Antitone (⨆ (i : ι), f i)

source

theorem Antitone.iInf {α : Type u_1} {β : Type u_2} {ι : Sort u_9} [Preorder α] [CompleteLattice β] {f : ι → α → β} (hf : ∀ (i : ι), Antitone (f i)) :

Antitone (⨅ (i : ι), f i)

source

instance Prod.supSet (α : Type u_1) (β : Type u_2) [SupSet α] [SupSet β] :

SupSet (α × β)

Equations

Prod.supSet α β = { sSup := fun (s : Set (α × β)) => (sSup (Prod.fst '' s), sSup (Prod.snd '' s)) }

source

instance Prod.infSet (α : Type u_1) (β : Type u_2) [InfSet α] [InfSet β] :

InfSet (α × β)

Equations

Prod.infSet α β = { sInf := fun (s : Set (α × β)) => (sInf (Prod.fst '' s), sInf (Prod.snd '' s)) }

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theorem Prod.fst_sInf {α : Type u_1} {β : Type u_2} [InfSet α] [InfSet β] (s : Set (α × β)) :

(sInf s).1 = sInf (Prod.fst '' s)

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theorem Prod.snd_sInf {α : Type u_1} {β : Type u_2} [InfSet α] [InfSet β] (s : Set (α × β)) :

(sInf s).2 = sInf (Prod.snd '' s)

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theorem Prod.swap_sInf {α : Type u_1} {β : Type u_2} [InfSet α] [InfSet β] (s : Set (α × β)) :

(sInf s).swap = sInf (Prod.swap '' s)

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theorem Prod.fst_sSup {α : Type u_1} {β : Type u_2} [SupSet α] [SupSet β] (s : Set (α × β)) :

(sSup s).1 = sSup (Prod.fst '' s)

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theorem Prod.snd_sSup {α : Type u_1} {β : Type u_2} [SupSet α] [SupSet β] (s : Set (α × β)) :

(sSup s).2 = sSup (Prod.snd '' s)

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theorem Prod.swap_sSup {α : Type u_1} {β : Type u_2} [SupSet α] [SupSet β] (s : Set (α × β)) :

(sSup s).swap = sSup (Prod.swap '' s)

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theorem Prod.fst_iInf {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [InfSet α] [InfSet β] (f : ι → α × β) :

(iInf f).1 = ⨅ (i : ι), (f i).1

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theorem Prod.snd_iInf {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [InfSet α] [InfSet β] (f : ι → α × β) :

(iInf f).2 = ⨅ (i : ι), (f i).2

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theorem Prod.swap_iInf {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [InfSet α] [InfSet β] (f : ι → α × β) :

(iInf f).swap = ⨅ (i : ι), (f i).swap

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theorem Prod.iInf_mk {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [InfSet α] [InfSet β] (f : ι → α) (g : ι → β) :

⨅ (i : ι), (f i, g i) = (⨅ (i : ι), f i, ⨅ (i : ι), g i)

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theorem Prod.fst_iSup {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [SupSet α] [SupSet β] (f : ι → α × β) :

(iSup f).1 = ⨆ (i : ι), (f i).1

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theorem Prod.snd_iSup {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [SupSet α] [SupSet β] (f : ι → α × β) :

(iSup f).2 = ⨆ (i : ι), (f i).2

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theorem Prod.swap_iSup {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [SupSet α] [SupSet β] (f : ι → α × β) :

(iSup f).swap = ⨆ (i : ι), (f i).swap

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theorem Prod.iSup_mk {α : Type u_1} {β : Type u_2} {ι : Sort u_5} [SupSet α] [SupSet β] (f : ι → α) (g : ι → β) :

⨆ (i : ι), (f i, g i) = (⨆ (i : ι), f i, ⨆ (i : ι), g i)

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instance Prod.instCompleteLattice {α : Type u_1} {β : Type u_2} [CompleteLattice α] [CompleteLattice β] :

CompleteLattice (α × β)

Equations

Prod.instCompleteLattice = CompleteLattice.mk ⋯ ⋯ ⋯ ⋯ ⋯ ⋯

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theorem sInf_prod {α : Type u_1} {β : Type u_2} [InfSet α] [InfSet β] {s : Set α} {t : Set β} (hs : s.Nonempty) (ht : t.Nonempty) :

sInf (s ×ˢ t) = (sInf s, sInf t)

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theorem sSup_prod {α : Type u_1} {β : Type u_2} [SupSet α] [SupSet β] {s : Set α} {t : Set β} (hs : s.Nonempty) (ht : t.Nonempty) :

sSup (s ×ˢ t) = (sSup s, sSup t)

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theorem sup_sInf_le_iInf_sup {α : Type u_1} [CompleteLattice α] {a : α} {s : Set α} :

a ⊔ sInf s ≤ ⨅ b ∈ s, a ⊔ b

This is a weaker version of sup_sInf_eq

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theorem iSup_inf_le_inf_sSup {α : Type u_1} [CompleteLattice α] {a : α} {s : Set α} :

⨆ b ∈ s, a ⊓ b ≤ a ⊓ sSup s

This is a weaker version of inf_sSup_eq

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theorem sInf_sup_le_iInf_sup {α : Type u_1} [CompleteLattice α] {a : α} {s : Set α} :

sInf s ⊔ a ≤ ⨅ b ∈ s, b ⊔ a

This is a weaker version of sInf_sup_eq

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theorem iSup_inf_le_sSup_inf {α : Type u_1} [CompleteLattice α] {a : α} {s : Set α} :

⨆ b ∈ s, b ⊓ a ≤ sSup s ⊓ a

This is a weaker version of sSup_inf_eq

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theorem le_iSup_inf_iSup {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (f : ι → α) (g : ι → α) :

⨆ (i : ι), f i ⊓ g i ≤ (⨆ (i : ι), f i) ⊓ ⨆ (i : ι), g i

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theorem iInf_sup_iInf_le {α : Type u_1} {ι : Sort u_5} [CompleteLattice α] (f : ι → α) (g : ι → α) :

(⨅ (i : ι), f i) ⊔ ⨅ (i : ι), g i ≤ ⨅ (i : ι), f i ⊔ g i

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theorem disjoint_sSup_left {α : Type u_1} [CompleteLattice α] {a : Set α} {b : α} (d : Disjoint (sSup a) b) {i : α} (hi : i ∈ a) :

Disjoint i b

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theorem disjoint_sSup_right {α : Type u_1} [CompleteLattice α] {a : Set α} {b : α} (d : Disjoint b (sSup a)) {i : α} (hi : i ∈ a) :

Disjoint b i

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@[reducible, inline]

abbrev Function.Injective.completeLattice {α : Type u_1} {β : Type u_2} [Sup α] [Inf α] [SupSet α] [InfSet α] [Top α] [Bot α] [CompleteLattice β] (f : α → β) (hf : Function.Injective f) (map_sup : ∀ (a b : α), f (a ⊔ b) = f a ⊔ f b) (map_inf : ∀ (a b : α), f (a ⊓ b) = f a ⊓ f b) (map_sSup : ∀ (s : Set α), f (sSup s) = ⨆ a ∈ s, f a) (map_sInf : ∀ (s : Set α), f (sInf s) = ⨅ a ∈ s, f a) (map_top : f ⊤ = ⊤) (map_bot : f ⊥ = ⊥) :

CompleteLattice α

Pullback a CompleteLattice along an injection.

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