category_theory.sites.surjective | Mathlib porting status

Changes since the initial port

The following section lists changes to this file in mathlib3 and mathlib4 that occured after the initial port. Most recent changes are shown first. Hovering over a commit will show all commits associated with the same mathlib3 commit.

Changes in mathlib3

70fd9563

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

087c325a

bump to nightly-2023-09-24-06

mathlib commit https://github.com/leanprover-community/mathlib/commit/ce64cd319bb6b3e82f31c2d38e79080d377be451

5655435f

Diff

@@ -3,8 +3,8 @@ Copyright (c) 2022 Andrew Yang. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Andrew Yang
 -/
-import Mathbin.CategoryTheory.Sites.Subsheaf
-import Mathbin.CategoryTheory.Sites.CompatibleSheafification
+import CategoryTheory.Sites.Subsheaf
+import CategoryTheory.Sites.CompatibleSheafification
 
 #align_import category_theory.sites.surjective from "leanprover-community/mathlib"@"087c325ae0ab42dbdd5dee55bc37d3d5a0bf2197"

087c325a

bump to nightly-2023-07-20-09

mathlib commit https://github.com/leanprover-community/mathlib/commit/8ea5598db6caeddde6cb734aa179cc2408dbd345

9c56d0dd

Diff

@@ -2,15 +2,12 @@
 Copyright (c) 2022 Andrew Yang. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Andrew Yang
-
-! This file was ported from Lean 3 source module category_theory.sites.surjective
-! leanprover-community/mathlib commit 087c325ae0ab42dbdd5dee55bc37d3d5a0bf2197
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.CategoryTheory.Sites.Subsheaf
 import Mathbin.CategoryTheory.Sites.CompatibleSheafification
 
+#align_import category_theory.sites.surjective from "leanprover-community/mathlib"@"087c325ae0ab42dbdd5dee55bc37d3d5a0bf2197"
+
 /-!
 
 # Locally surjective morphisms

087c325a

bump to nightly-2023-06-20-01

mathlib commit https://github.com/leanprover-community/mathlib/commit/2a0ce625dbb0ffbc7d1316597de0b25c1ec75303

9b351f8c

Diff

@@ -74,7 +74,7 @@ theorem imageSieve_whisker_forget {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) {U : C} (s
 #print CategoryTheory.imageSieve_app /-
 theorem imageSieve_app {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) {U : C} (s : F.obj (op U)) :
     imageSieve f (f.app _ s) = ⊤ := by
-  ext (V i)
+  ext V i
   simp only [sieve.top_apply, iff_true_iff, image_sieve_apply]
   have := elementwise_of (f.naturality i.op)
   exact ⟨F.map i.op s, this s⟩

087c325a

bump to nightly-2023-06-13-21

mathlib commit https://github.com/leanprover-community/mathlib/commit/9fb8964792b4237dac6200193a0d533f1b3f7423

829520ac

Diff

@@ -43,6 +43,7 @@ attribute [local instance] concrete_category.has_coe_to_sort concrete_category.h
 
 variable {A : Type u'} [Category.{v'} A] [ConcreteCategory.{w'} A]
 
+#print CategoryTheory.imageSieve /-
 /-- Given `f : F ⟶ G`, a morphism between presieves, and `s : G.obj (op U)`, this is the sieve
 of `U` consisting of the `i : V ⟶ U` such that `s` restricted along `i` is in the image of `f`. -/
 @[simps (config := lemmasOnly)]
@@ -54,17 +55,23 @@ def imageSieve {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) {U : C} (s : G.obj (op U)) :
     refine' ⟨F.map j.op t, _⟩
     rw [op_comp, G.map_comp, comp_apply, ← ht, elementwise_of f.naturality]
 #align category_theory.image_sieve CategoryTheory.imageSieve
+-/
 
+#print CategoryTheory.imageSieve_eq_sieveOfSection /-
 theorem imageSieve_eq_sieveOfSection {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) {U : C} (s : G.obj (op U)) :
     imageSieve f s = (imagePresheaf (whiskerRight f (forget A))).sieveOfSection s :=
   rfl
 #align category_theory.image_sieve_eq_sieve_of_section CategoryTheory.imageSieve_eq_sieveOfSection
+-/
 
+#print CategoryTheory.imageSieve_whisker_forget /-
 theorem imageSieve_whisker_forget {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) {U : C} (s : G.obj (op U)) :
     imageSieve (whiskerRight f (forget A)) s = imageSieve f s :=
   rfl
 #align category_theory.image_sieve_whisker_forget CategoryTheory.imageSieve_whisker_forget
+-/
 
+#print CategoryTheory.imageSieve_app /-
 theorem imageSieve_app {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) {U : C} (s : F.obj (op U)) :
     imageSieve f (f.app _ s) = ⊤ := by
   ext (V i)
@@ -72,6 +79,7 @@ theorem imageSieve_app {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) {U : C} (s : F.obj (o
   have := elementwise_of (f.naturality i.op)
   exact ⟨F.map i.op s, this s⟩
 #align category_theory.image_sieve_app CategoryTheory.imageSieve_app
+-/
 
 #print CategoryTheory.IsLocallySurjective /-
 /-- A morphism of presheaves `f : F ⟶ G` is locally surjective with respect to a grothendieck
@@ -81,6 +89,7 @@ def IsLocallySurjective {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) : Prop :=
 #align category_theory.is_locally_surjective CategoryTheory.IsLocallySurjective
 -/
 
+#print CategoryTheory.isLocallySurjective_iff_imagePresheaf_sheafify_eq_top /-
 theorem isLocallySurjective_iff_imagePresheaf_sheafify_eq_top {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) :
     IsLocallySurjective J f ↔ (imagePresheaf (whiskerRight f (forget A))).sheafify J = ⊤ :=
   by
@@ -88,7 +97,9 @@ theorem isLocallySurjective_iff_imagePresheaf_sheafify_eq_top {F G : Cᵒᵖ ⥤
     Set.top_eq_univ, Set.mem_univ, iff_true_iff]
   exact ⟨fun H U => H (unop U), fun H U => H (op U)⟩
 #align category_theory.is_locally_surjective_iff_image_presheaf_sheafify_eq_top CategoryTheory.isLocallySurjective_iff_imagePresheaf_sheafify_eq_top
+-/
 
+#print CategoryTheory.isLocallySurjective_iff_imagePresheaf_sheafify_eq_top' /-
 theorem isLocallySurjective_iff_imagePresheaf_sheafify_eq_top' {F G : Cᵒᵖ ⥤ Type w} (f : F ⟶ G) :
     IsLocallySurjective J f ↔ (imagePresheaf f).sheafify J = ⊤ :=
   by
@@ -96,6 +107,7 @@ theorem isLocallySurjective_iff_imagePresheaf_sheafify_eq_top' {F G : Cᵒᵖ 
     Set.top_eq_univ, Set.mem_univ, iff_true_iff]
   exact ⟨fun H U => H (unop U), fun H U => H (op U)⟩
 #align category_theory.is_locally_surjective_iff_image_presheaf_sheafify_eq_top' CategoryTheory.isLocallySurjective_iff_imagePresheaf_sheafify_eq_top'
+-/
 
 #print CategoryTheory.isLocallySurjective_iff_isIso /-
 theorem isLocallySurjective_iff_isIso {F G : Sheaf J (Type w)} (f : F ⟶ G) :
@@ -116,6 +128,7 @@ theorem isLocallySurjective_iff_whisker_forget {F G : Cᵒᵖ ⥤ A} (f : F ⟶
 #align category_theory.is_locally_surjective_iff_whisker_forget CategoryTheory.isLocallySurjective_iff_whisker_forget
 -/
 
+#print CategoryTheory.isLocallySurjective_of_surjective /-
 theorem isLocallySurjective_of_surjective {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G)
     (H : ∀ U, Function.Surjective (f.app U)) : IsLocallySurjective J f :=
   by
@@ -124,6 +137,7 @@ theorem isLocallySurjective_of_surjective {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G)
   rw [image_sieve_app]
   exact J.top_mem _
 #align category_theory.is_locally_surjective_of_surjective CategoryTheory.isLocallySurjective_of_surjective
+-/
 
 #print CategoryTheory.isLocallySurjective_of_iso /-
 theorem isLocallySurjective_of_iso {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) [IsIso f] :
@@ -193,6 +207,7 @@ variable {B : Type w} [Category.{max u v} B] [ConcreteCategory.{max u v} B]
   [∀ (α β : Type max u v) (fst snd : β → α),
       Limits.HasLimitsOfShape (Limits.WalkingMulticospan fst snd) B]
 
+#print CategoryTheory.toSheafify_isLocallySurjective /-
 theorem toSheafify_isLocallySurjective (F : Cᵒᵖ ⥤ B) : IsLocallySurjective J (J.toSheafify F) :=
   by
   rw [is_locally_surjective_iff_whisker_forget, ← to_sheafify_comp_sheafify_comp_iso_inv]
@@ -201,6 +216,7 @@ theorem toSheafify_isLocallySurjective (F : Cᵒᵖ ⥤ B) : IsLocallySurjective
     exact is_iso.of_iso_inv (sheafification_iso_image_presheaf J (F ⋙ forget B))
   · exact is_locally_surjective_of_iso _ _
 #align category_theory.to_sheafify_is_locally_surjective CategoryTheory.toSheafify_isLocallySurjective
+-/
 
 end

087c325a

bump to nightly-2023-06-13-03

mathlib commit https://github.com/leanprover-community/mathlib/commit/9fb8964792b4237dac6200193a0d533f1b3f7423

c9322c77

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Andrew Yang
 
 ! This file was ported from Lean 3 source module category_theory.sites.surjective
-! leanprover-community/mathlib commit 70fd9563a21e7b963887c9360bd29b2393e6225a
+! leanprover-community/mathlib commit 087c325ae0ab42dbdd5dee55bc37d3d5a0bf2197
 ! Please do not edit these lines, except to modify the commit id
 ! if you have ported upstream changes.
 -/
@@ -15,6 +15,9 @@ import Mathbin.CategoryTheory.Sites.CompatibleSheafification
 
 # Locally surjective morphisms
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 ## Main definitions
 
 - `is_locally_surjective` : A morphism of presheaves valued in a concrete category is locally

70fd9563

bump to nightly-2023-06-11-17

mathlib commit https://github.com/leanprover-community/mathlib/commit/c471da714c044131b90c133701e51b877c246677

e85a8bfe

Diff

@@ -70,11 +70,13 @@ theorem imageSieve_app {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) {U : C} (s : F.obj (o
   exact ⟨F.map i.op s, this s⟩
 #align category_theory.image_sieve_app CategoryTheory.imageSieve_app
 
+#print CategoryTheory.IsLocallySurjective /-
 /-- A morphism of presheaves `f : F ⟶ G` is locally surjective with respect to a grothendieck
 topology if every section of `G` is locally in the image of `f`. -/
 def IsLocallySurjective {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) : Prop :=
   ∀ (U : C) (s : G.obj (op U)), imageSieve f s ∈ J U
 #align category_theory.is_locally_surjective CategoryTheory.IsLocallySurjective
+-/
 
 theorem isLocallySurjective_iff_imagePresheaf_sheafify_eq_top {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) :
     IsLocallySurjective J f ↔ (imagePresheaf (whiskerRight f (forget A))).sheafify J = ⊤ :=
@@ -92,6 +94,7 @@ theorem isLocallySurjective_iff_imagePresheaf_sheafify_eq_top' {F G : Cᵒᵖ 
   exact ⟨fun H U => H (unop U), fun H U => H (op U)⟩
 #align category_theory.is_locally_surjective_iff_image_presheaf_sheafify_eq_top' CategoryTheory.isLocallySurjective_iff_imagePresheaf_sheafify_eq_top'
 
+#print CategoryTheory.isLocallySurjective_iff_isIso /-
 theorem isLocallySurjective_iff_isIso {F G : Sheaf J (Type w)} (f : F ⟶ G) :
     IsLocallySurjective J f.1 ↔ IsIso (imageSheafι f) :=
   by
@@ -101,11 +104,14 @@ theorem isLocallySurjective_iff_isIso {F G : Sheaf J (Type w)} (f : F ⟶ G) :
     ⟨fun h => @is_iso_of_reflects_iso _ _ (image_sheaf_ι f) (Sheaf_to_presheaf J _) h _, fun h =>
       @functor.map_is_iso _ _ (Sheaf_to_presheaf J _) _ h⟩
 #align category_theory.is_locally_surjective_iff_is_iso CategoryTheory.isLocallySurjective_iff_isIso
+-/
 
+#print CategoryTheory.isLocallySurjective_iff_whisker_forget /-
 theorem isLocallySurjective_iff_whisker_forget {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) :
     IsLocallySurjective J f ↔ IsLocallySurjective J (whiskerRight f (forget A)) := by
   simpa only [is_locally_surjective_iff_image_presheaf_sheafify_eq_top]
 #align category_theory.is_locally_surjective_iff_whisker_forget CategoryTheory.isLocallySurjective_iff_whisker_forget
+-/
 
 theorem isLocallySurjective_of_surjective {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G)
     (H : ∀ U, Function.Surjective (f.app U)) : IsLocallySurjective J f :=
@@ -116,6 +122,7 @@ theorem isLocallySurjective_of_surjective {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G)
   exact J.top_mem _
 #align category_theory.is_locally_surjective_of_surjective CategoryTheory.isLocallySurjective_of_surjective
 
+#print CategoryTheory.isLocallySurjective_of_iso /-
 theorem isLocallySurjective_of_iso {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) [IsIso f] :
     IsLocallySurjective J f :=
   by
@@ -125,7 +132,9 @@ theorem isLocallySurjective_of_iso {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) [IsIso f]
   rw [← is_iso_iff_bijective]
   infer_instance
 #align category_theory.is_locally_surjective_of_iso CategoryTheory.isLocallySurjective_of_iso
+-/
 
+#print CategoryTheory.IsLocallySurjective.comp /-
 theorem IsLocallySurjective.comp {F₁ F₂ F₃ : Cᵒᵖ ⥤ A} {f₁ : F₁ ⟶ F₂} {f₂ : F₂ ⟶ F₃}
     (h₁ : IsLocallySurjective J f₁) (h₂ : IsLocallySurjective J f₂) :
     IsLocallySurjective J (f₁ ≫ f₂) := by
@@ -142,11 +151,13 @@ theorem IsLocallySurjective.comp {F₁ F₂ F₃ : Cᵒᵖ ⥤ A} {f₁ : F₁ 
   · apply h₂
   · intros; apply h₁
 #align category_theory.is_locally_surjective.comp CategoryTheory.IsLocallySurjective.comp
+-/
 
 section
 
 variable (F : Cᵒᵖ ⥤ Type max u v)
 
+#print CategoryTheory.sheafificationIsoImagePresheaf /-
 /-- The image of `F` in `J.sheafify F` is isomorphic to the sheafification. -/
 noncomputable def sheafificationIsoImagePresheaf :
     J.sheafify F ≅ ((imagePresheaf (J.toSheafify F)).sheafify J).toPresheaf
@@ -167,6 +178,7 @@ noncomputable def sheafificationIsoImagePresheaf :
     exact J.sheafify_hom_ext _ _ (J.sheafify_is_sheaf _) (by simp [to_image_presheaf_sheafify])
     infer_instance
 #align category_theory.sheafification_iso_image_presheaf CategoryTheory.sheafificationIsoImagePresheaf
+-/
 
 -- We need to sheafify
 variable {B : Type w} [Category.{max u v} B] [ConcreteCategory.{max u v} B]

70fd9563

bump to nightly-2023-06-01-16

mathlib commit https://github.com/leanprover-community/mathlib/commit/cca40788df1b8755d5baf17ab2f27dacc2e17acb

b9c87c70

Diff

@@ -140,7 +140,7 @@ theorem IsLocallySurjective.comp {F₁ F₂ F₃ : Cᵒᵖ ⥤ A} {f₁ : F₁ 
   apply J.superset_covering this
   apply J.bind_covering
   · apply h₂
-  · intros ; apply h₁
+  · intros; apply h₁
 #align category_theory.is_locally_surjective.comp CategoryTheory.IsLocallySurjective.comp
 
 section

70fd9563

bump to nightly-2023-05-28-04

mathlib commit https://github.com/leanprover-community/mathlib/commit/917c3c072e487b3cccdbfeff17e75b40e45f66cb

6797a637

Diff

@@ -140,8 +140,7 @@ theorem IsLocallySurjective.comp {F₁ F₂ F₃ : Cᵒᵖ ⥤ A} {f₁ : F₁ 
   apply J.superset_covering this
   apply J.bind_covering
   · apply h₂
-  · intros
-    apply h₁
+  · intros ; apply h₁
 #align category_theory.is_locally_surjective.comp CategoryTheory.IsLocallySurjective.comp
 
 section

70fd9563

bump to nightly-2023-02-21-16

mathlib commit https://github.com/leanprover-community/mathlib/commit/bd9851ca476957ea4549eb19b40e7b5ade9428cc

1107b979

Changes in mathlib4

mathlib3

mathlib4

70fd9563

refactor(*): abbreviation for non-dependent FunLike (#9833)

This follows up from #9785, which renamed FunLike to DFunLike, by introducing a new abbreviation FunLike F α β := DFunLike F α (fun _ => β), to make the non-dependent use of FunLike easier.

I searched for the pattern DFunLike.*fun and DFunLike.*λ in all files to replace expressions of the form DFunLike F α (fun _ => β) with FunLike F α β. I did this everywhere except for extends clauses for two reasons: it would conflict with #8386, and more importantly extends must directly refer to a structure with no unfolding of defs or abbrevs.

54792e9e

Diff

@@ -32,7 +32,7 @@ namespace CategoryTheory
 
 variable {C : Type u} [Category.{v} C] (J : GrothendieckTopology C)
 
-attribute [local instance] ConcreteCategory.hasCoeToSort ConcreteCategory.instDFunLike
+attribute [local instance] ConcreteCategory.hasCoeToSort ConcreteCategory.instFunLike
 
 variable {A : Type u'} [Category.{v'} A] [ConcreteCategory.{w'} A]

70fd9563

chore(*): rename FunLike to DFunLike (#9785)

This prepares for the introduction of a non-dependent synonym of FunLike, which helps a lot with keeping #8386 readable.

This is entirely search-and-replace in 680197f combined with manual fixes in 4145626, e900597 and b8428f8. The commands that generated this change:

sed -i 's/\bFunLike\b/DFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/\btoFunLike\b/toDFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/import Mathlib.Data.DFunLike/import Mathlib.Data.FunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/\bHom_FunLike\b/Hom_DFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean     
sed -i 's/\binstFunLike\b/instDFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/\bfunLike\b/instDFunLike/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean
sed -i 's/\btoo many metavariables to apply `fun_like.has_coe_to_fun`/too many metavariables to apply `DFunLike.hasCoeToFun`/g' {Archive,Counterexamples,Mathlib,test}/**/*.lean

Co-authored-by: Anne Baanen <Vierkantor@users.noreply.github.com>

82656743

Diff

@@ -32,7 +32,7 @@ namespace CategoryTheory
 
 variable {C : Type u} [Category.{v} C] (J : GrothendieckTopology C)
 
-attribute [local instance] ConcreteCategory.hasCoeToSort ConcreteCategory.funLike
+attribute [local instance] ConcreteCategory.hasCoeToSort ConcreteCategory.instDFunLike
 
 variable {A : Type u'} [Category.{v'} A] [ConcreteCategory.{w'} A]

70fd9563

refactor(CategoryTheory/Sites): sheafification as an abstract left adjoint (#9012)

We define a typeclass HasSheafify which says that presheaves on a site with values in some category can be sheafified, i.e. that the inclusion functor from sheaves to presheaves has a left exact left adjoint. We redefine presheafToSheaf as an arbitrary choice of such a left adjoint.

4a55c95f

Diff

@@ -144,7 +144,7 @@ noncomputable def sheafificationIsoImagePresheaf :
     J.sheafifyLift (toImagePresheafSheafify J _)
       ((isSheaf_iff_isSheaf_of_type J _).mpr <|
         Subpresheaf.sheafify_isSheaf _ <|
-          (isSheaf_iff_isSheaf_of_type J _).mp <| sheafify_isSheaf J _)
+          (isSheaf_iff_isSheaf_of_type J _).mp <| GrothendieckTopology.sheafify_isSheaf J _)
   inv := Subpresheaf.ι _
   hom_inv_id :=
     J.sheafify_hom_ext _ _ (J.sheafify_isSheaf _) (by simp [toImagePresheafSheafify])

70fd9563

chore: space after ← (#8178)

Co-authored-by: Moritz Firsching <firsching@google.com>

5fb9beab

Diff

@@ -113,7 +113,7 @@ theorem isLocallySurjective_of_iso {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) [IsIso f]
   apply isLocallySurjective_of_surjective
   intro U
   apply Function.Bijective.surjective
-  rw [← isIso_iff_bijective, ←forget_map_eq_coe]
+  rw [← isIso_iff_bijective, ← forget_map_eq_coe]
   infer_instance
 #align category_theory.is_locally_surjective_of_iso CategoryTheory.isLocallySurjective_of_iso

70fd9563

chore: script to replace headers with #align_import statements (#5979)

depends on: #5966

Co-authored-by: Eric Wieser <wieser.eric@gmail.com> Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

89aa3a3b

Diff

@@ -2,14 +2,11 @@
 Copyright (c) 2022 Andrew Yang. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Andrew Yang
-
-! This file was ported from Lean 3 source module category_theory.sites.surjective
-! leanprover-community/mathlib commit 70fd9563a21e7b963887c9360bd29b2393e6225a
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.CategoryTheory.Sites.Subsheaf
 import Mathlib.CategoryTheory.Sites.CompatibleSheafification
+
+#align_import category_theory.sites.surjective from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225a"
 /-!
 
 # Locally surjective morphisms

70fd9563

chore: bump Std4 (#5219)

Co-authored-by: Scott Morrison <scott.morrison@anu.edu.au> Co-authored-by: Mario Carneiro <di.gama@gmail.com>

59c36da5

Diff

@@ -62,8 +62,7 @@ theorem imageSieve_whisker_forget {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) {U : C} (s
 
 theorem imageSieve_app {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) {U : C} (s : F.obj (op U)) :
     imageSieve f (f.app _ s) = ⊤ := by
-  ext V
-  intro i
+  ext V i
   simp only [Sieve.top_apply, iff_true_iff, imageSieve_apply]
   have := elementwise_of% (f.naturality i.op)
   exact ⟨F.map i.op s, this s⟩

70fd9563

feat: change ConcreteCategory.hasCoeToFun to FunLike (#4693)

b7cba33a

Diff

@@ -35,7 +35,7 @@ namespace CategoryTheory
 
 variable {C : Type u} [Category.{v} C] (J : GrothendieckTopology C)
 
-attribute [local instance] ConcreteCategory.hasCoeToSort ConcreteCategory.hasCoeToFun
+attribute [local instance] ConcreteCategory.hasCoeToSort ConcreteCategory.funLike
 
 variable {A : Type u'} [Category.{v'} A] [ConcreteCategory.{w'} A]
 
@@ -117,7 +117,7 @@ theorem isLocallySurjective_of_iso {F G : Cᵒᵖ ⥤ A} (f : F ⟶ G) [IsIso f]
   apply isLocallySurjective_of_surjective
   intro U
   apply Function.Bijective.surjective
-  rw [← isIso_iff_bijective]
+  rw [← isIso_iff_bijective, ←forget_map_eq_coe]
   infer_instance
 #align category_theory.is_locally_surjective_of_iso CategoryTheory.isLocallySurjective_of_iso

70fd9563

feat: port CategoryTheory.Sites.Surjective (#4969)

Co-authored-by: Moritz Firsching <firsching@google.com>

57f3c44f

`category_theory.sites.surjective` ⟷ `Mathlib.CategoryTheory.Sites.Surjective`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 3 + 329

category_theory.sites.surjective ⟷ Mathlib.CategoryTheory.Sites.Surjective

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 3 + 329

`category_theory.sites.surjective` ⟷ `Mathlib.CategoryTheory.Sites.Surjective`