English
If F,G are presheaves on Cᵒᵖ valued in A with G a sheaf, then the presheaf of enriched Hom from F to G is a sheaf (under suitable Enriched Hom structure).
Русский
Если F,G — прешерфы на Cᵒᵖ со значениями в A, и G —Sheaf, то прешерф гомоморфизмов обогащённых из F в G является Sheaf.
LaTeX
$$Presheaf.IsSheaf J (functorEnrichedHom A F G)$$
Lean4
theorem isSheaf_functorEnrichedHom (F G : Cᵒᵖ ⥤ A) (hG : Presheaf.IsSheaf J G) [HasFunctorEnrichedHom A F G] :
Presheaf.IsSheaf J (functorEnrichedHom A F G) := fun M ↦
by
rw [Presieve.isSheaf_iff_of_nat_equiv (functorEnrichedHomCoyonedaObjEquiv M F G)
(fun _ _ _ _ ↦ functorEnrichedHomCoyonedaObjEquiv_naturality _ _)]
rw [← isSheaf_iff_isSheaf_of_type]
exact Presheaf.IsSheaf.hom (F ⊗ (Functor.const _).obj M) G hG