Functor categories are enriched #
If C is a V-enriched ordinary category, then J ⥤ C is also
both a V-enriched ordinary category and a J ⥤ V-enriched
ordinary category, provided C has suitable limits.
We first define the V-enriched structure on J ⥤ C by saying
that if F₁ and F₂ are in J ⥤ C, then enrichedHom V F₁ F₂ : V
is a suitable limit involving F₁.obj j ⟶[V] F₂.obj j for all j : C.
The J ⥤ V object of morphisms functorEnrichedHom V F₁ F₂ : J ⥤ V
is defined by sending j : J to the previously defined enrichedHom
for the "restriction" of F₁ and F₂ to the category Under j.
The definition isLimitConeFunctorEnrichedHom shows that
enriched V F₁ F₂ is the limit of the functor functorEnrichedHom V F₁ F₂.
Given two functors F₁ and F₂ from a category J to a V-enriched
ordinary category C, this is the diagram Jᵒᵖ ⥤ J ⥤ V whose end shall be
the V-morphisms in J ⥤ V from F₁ to F₂.
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- CategoryTheory.Enriched.FunctorCategory.diagram V F₁ F₂ = F₁.op.comp ((CategoryTheory.eHomFunctor V C).comp ((CategoryTheory.whiskeringLeft J C V).obj F₂))
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The condition that the end diagram V F₁ F₂ exists, see enrichedHom.
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The V-enriched hom from F₁ to F₂ when F₁ and F₂ are functors J ⥤ C
and C is a V-enriched category.
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The projection enrichedHom V F₁ F₂ ⟶ F₁.obj j ⟶[V] F₂.obj j in the category V
for any j : J when F₁ and F₂ are functors J ⥤ C and C is a V-enriched category.
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Given functors F₁ and F₂ in J ⥤ C, where C is a V-enriched ordinary category,
this is the bijection (F₁ ⟶ F₂) ≃ (𝟙_ V ⟶ enrichedHom V F₁ F₂).
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- One or more equations did not get rendered due to their size.
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The identity for the V-enrichment of the category J ⥤ C.
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The composition for the V-enrichment of the category J ⥤ C.
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- One or more equations did not get rendered due to their size.
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If C is a V-enriched ordinary category, and C has suitable limits,
then J ⥤ C is also a V-enriched ordinary category.
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- One or more equations did not get rendered due to their size.
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If F₁ and F₂ are functors J ⥤ C, G : K ⥤ J, and
F₁' and F₂' are functors K ⥤ C that are respectively
isomorphic to G ⋙ F₁ and G ⋙ F₂, then this is the
induced morphism enrichedHom V F₁ F₂ ⟶ enrichedHom V F₁' F₂' in V
when C is a category enriched in V.
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- One or more equations did not get rendered due to their size.
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If F₁ and F₂ are functors J ⥤ C, and G : K ⥤ J,
then this is the induced morphism
enrichedHom V F₁ F₂ ⟶ enrichedHom V (G ⋙ F₁) (G ⋙ F₂) in V
when C is a category enriched in V.
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- One or more equations did not get rendered due to their size.
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Given functors F₁ and F₂ in J ⥤ C, where C is a category enriched in V,
this condition allows the definition of functorEnrichedHom V F₁ F₂ : J ⥤ V.
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Given functors F₁ and F₂ in J ⥤ C, where C is a category enriched in V,
this is the enriched hom functor from F₁ to F₂ in J ⥤ V.
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The (limit) cone expressing that the limit of functorEnrichedHom V F₁ F₂
is enrichedHom V F₁ F₂.
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Auxiliary definition for Enriched.FunctorCategory.isLimitConeFunctorEnrichedHom.
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The limit of functorEnrichedHom V F₁ F₂ is enrichedHom V F₁ F₂.
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- CategoryTheory.Enriched.FunctorCategory.isLimitConeFunctorEnrichedHom V F₁ F₂ = { lift := CategoryTheory.Enriched.FunctorCategory.isLimitConeFunctorEnrichedHom.lift, fac := ⋯, uniq := ⋯ }
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The identity for the J ⥤ V-enrichment of the category J ⥤ C.
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The composition for the J ⥤ V-enrichment of the category J ⥤ C.
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- One or more equations did not get rendered due to their size.
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If C is a V-enriched ordinary category, and C has suitable limits,
then J ⥤ C is also a J ⥤ V-enriched ordinary category.
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- One or more equations did not get rendered due to their size.
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Given functors F₁ and F₂ in J ⥤ C, where C is a V-enriched ordinary category,
this is the bijection (F₁ ⟶ F₂) ≃ (𝟙_ (J ⥤ V) ⟶ functorEnrichedHom V F₁ F₂).
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- One or more equations did not get rendered due to their size.
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If C is a V-enriched ordinary category, and C has suitable limits,
then J ⥤ C is also a J ⥤ V-enriched ordinary category.
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- One or more equations did not get rendered due to their size.