Theorems · Theorem · category theory

CategoryTheory.GrothendieckTopology.Plus.isSheaf_plus_plus

∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] (J : CategoryTheory.GrothendieckTopology C) {D : Type w}
  [inst_1 : CategoryTheory.Category.{w', w} D] {FD : D → D → Type u_1} {CD : D → Type t}
  [inst_2 : (X Y : D) → FunLike (FD X Y) (CD X) (CD Y)] [instCC : CategoryTheory.ConcreteCategory D FD]
  [∀ {X : C} (S : J.Cover X),
      CategoryTheory.Limits.PreservesLimitsOfShape (CategoryTheory.Limits.WalkingMulticospan S.shape)
        (CategoryTheory.forget D)]
  [inst_4 : ∀ (X : C), CategoryTheory.Limits.HasColimitsOfShape (J.Cover X)ᵒᵖ D]
  [inst_5 :
    ∀ (P : CategoryTheory.Functor Cᵒᵖ D) (X : C) (S : J.Cover X), CategoryTheory.Limits.HasMultiequalizer (S.index P)]
  [∀ (X : C), CategoryTheory.Limits.PreservesColimitsOfShape (J.Cover X)ᵒᵖ (CategoryTheory.forget D)]
  [(CategoryTheory.forget D).ReflectsIsomorphisms] (P : CategoryTheory.Functor Cᵒᵖ D),
  CategoryTheory.Presheaf.IsSheaf J (J.plusObj (J.plusObj P))

P⁺⁺ is always a sheaf.

Defined in

Mathlib.CategoryTheory.Sites.ConcreteSheafification

Cited by

1 results in Mathlib

Foundations

Depth 57 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

CategoryTheory.CategoryCategoryTheory.CategoryFunLikeCategoryTheory.ConcreteCategoryCategoryTheory.Limits.PreservesLimitsOfShapeCategoryTheory.Limits.HasColimitsOfShapeCategoryTheory.Limits.HasMultiequalizerCategoryTheory.Limits.PreservesColimitsOfShapeCategoryTheory.Functor.ReflectsIsomorphisms