category_theory.abelian.transfer | 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

ef553359

bump to nightly-2024-04-14-09

mathlib commit https://github.com/leanprover-community/mathlib/commit/65a1391a0106c9204fe45bc73a039f056558cb83

f736ea6b

Diff

@@ -207,7 +207,7 @@ then `C` is also abelian.
 -/
 def abelianOfEquivalence {C : Type u₁} [Category.{v} C] [Preadditive C] [HasFiniteProducts C]
     {D : Type u₂} [Category.{v} D] [Abelian D] (F : C ⥤ D) [Functor.PreservesZeroMorphisms F]
-    [IsEquivalence F] : Abelian C :=
+    [CategoryTheory.Functor.IsEquivalence F] : Abelian C :=
   abelianOfAdjunction F F.inv F.asEquivalence.unitIso.symm F.asEquivalence.symm.toAdjunction
 #align category_theory.abelian_of_equivalence CategoryTheory.abelianOfEquivalence
 -/

ef553359

bump to nightly-2024-03-17-08

mathlib commit https://github.com/leanprover-community/mathlib/commit/65a1391a0106c9204fe45bc73a039f056558cb83

22f01ce4

Diff

@@ -62,7 +62,7 @@ theorem hasKernels [PreservesFiniteLimits G] : HasKernels C :=
   {
     HasLimit := fun X Y f => by
       have := nat_iso.naturality_1 i f
-      simp at this 
+      simp at this
       rw [← this]
       haveI : has_kernel (G.map (F.map f) ≫ i.hom.app _) := limits.has_kernel_comp_mono _ _
       apply limits.has_kernel_iso_comp }
@@ -77,7 +77,7 @@ theorem hasCokernels : HasCokernels C :=
       by
       haveI : preserves_colimits G := adj.left_adjoint_preserves_colimits
       have := nat_iso.naturality_1 i f
-      simp at this 
+      simp at this
       rw [← this]
       haveI : has_cokernel (G.map (F.map f) ≫ i.hom.app _) := limits.has_cokernel_comp_iso _ _
       apply limits.has_cokernel_epi_comp }

ef553359

bump to nightly-2023-09-24-06

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

5655435f

Diff

@@ -3,9 +3,9 @@ Copyright (c) 2022 Scott Morrison. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Scott Morrison
 -/
-import Mathbin.CategoryTheory.Abelian.Basic
-import Mathbin.CategoryTheory.Limits.Preserves.Shapes.Kernels
-import Mathbin.CategoryTheory.Adjunction.Limits
+import CategoryTheory.Abelian.Basic
+import CategoryTheory.Limits.Preserves.Shapes.Kernels
+import CategoryTheory.Adjunction.Limits
 
 #align_import category_theory.abelian.transfer from "leanprover-community/mathlib"@"ef55335933293309ff8c0b1d20ffffeecbe5c39f"

ef553359

bump to nightly-2023-07-20-09

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

9c56d0dd

Diff

@@ -2,16 +2,13 @@
 Copyright (c) 2022 Scott Morrison. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Scott Morrison
-
-! This file was ported from Lean 3 source module category_theory.abelian.transfer
-! leanprover-community/mathlib commit ef55335933293309ff8c0b1d20ffffeecbe5c39f
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.CategoryTheory.Abelian.Basic
 import Mathbin.CategoryTheory.Limits.Preserves.Shapes.Kernels
 import Mathbin.CategoryTheory.Adjunction.Limits
 
+#align_import category_theory.abelian.transfer from "leanprover-community/mathlib"@"ef55335933293309ff8c0b1d20ffffeecbe5c39f"
+
 /-!
 # Transferring "abelian-ness" across a functor

ef553359

bump to nightly-2023-06-13-21

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

829520ac

Diff

@@ -59,8 +59,6 @@ variable (G : D ⥤ C) [Functor.PreservesZeroMorphisms G]
 
 variable (i : F ⋙ G ≅ 𝟭 C) (adj : G ⊣ F)
 
-include i
-
 #print CategoryTheory.AbelianOfAdjunction.hasKernels /-
 /-- No point making this an instance, as it requires `i`. -/
 theorem hasKernels [PreservesFiniteLimits G] : HasKernels C :=
@@ -74,8 +72,6 @@ theorem hasKernels [PreservesFiniteLimits G] : HasKernels C :=
 #align category_theory.abelian_of_adjunction.has_kernels CategoryTheory.AbelianOfAdjunction.hasKernels
 -/
 
-include adj
-
 #print CategoryTheory.AbelianOfAdjunction.hasCokernels /-
 /-- No point making this an instance, as it requires `i` and `adj`. -/
 theorem hasCokernels : HasCokernels C :=
@@ -93,6 +89,7 @@ theorem hasCokernels : HasCokernels C :=
 
 variable [Limits.HasCokernels C]
 
+#print CategoryTheory.AbelianOfAdjunction.cokernelIso /-
 /-- Auxiliary construction for `coimage_iso_image` -/
 def cokernelIso {X Y : C} (f : X ⟶ Y) : G.obj (cokernel (F.map f)) ≅ cokernel f :=
   by
@@ -106,9 +103,11 @@ def cokernelIso {X Y : C} (f : X ⟶ Y) : G.obj (cokernel (F.map f)) ≅ cokerne
     _ ≅ cokernel (f ≫ _) := (cokernel_epi_comp _ _)
     _ ≅ cokernel f := cokernel_comp_is_iso _ _
 #align category_theory.abelian_of_adjunction.cokernel_iso CategoryTheory.AbelianOfAdjunction.cokernelIso
+-/
 
 variable [Limits.HasKernels C] [PreservesFiniteLimits G]
 
+#print CategoryTheory.AbelianOfAdjunction.coimageIsoImageAux /-
 /-- Auxiliary construction for `coimage_iso_image` -/
 def coimageIsoImageAux {X Y : C} (f : X ⟶ Y) :
     kernel (G.map (cokernel.π (F.map f))) ≅ kernel (cokernel.π f) :=
@@ -133,6 +132,7 @@ def coimageIsoImageAux {X Y : C} (f : X ⟶ Y) :
     _ ≅ kernel (cokernel.π f ≫ _) := (kernel_is_iso_comp _ _)
     _ ≅ kernel (cokernel.π f) := kernel_comp_mono _ _
 #align category_theory.abelian_of_adjunction.coimage_iso_image_aux CategoryTheory.AbelianOfAdjunction.coimageIsoImageAux
+-/
 
 variable [Functor.PreservesZeroMorphisms F]

ef553359

bump to nightly-2023-06-09-07

mathlib commit https://github.com/leanprover-community/mathlib/commit/7e5137f579de09a059a5ce98f364a04e221aabf0

16afdc39

Diff

@@ -105,7 +105,6 @@ def cokernelIso {X Y : C} (f : X ⟶ Y) : G.obj (cokernel (F.map f)) ≅ cokerne
     _ ≅ cokernel (_ ≫ f ≫ _) := (cokernel_iso_of_eq (nat_iso.naturality_2 i f).symm)
     _ ≅ cokernel (f ≫ _) := (cokernel_epi_comp _ _)
     _ ≅ cokernel f := cokernel_comp_is_iso _ _
-    
 #align category_theory.abelian_of_adjunction.cokernel_iso CategoryTheory.AbelianOfAdjunction.cokernelIso
 
 variable [Limits.HasKernels C] [PreservesFiniteLimits G]
@@ -133,7 +132,6 @@ def coimageIsoImageAux {X Y : C} (f : X ⟶ Y) :
             nat_iso.inv_inv_app]))
     _ ≅ kernel (cokernel.π f ≫ _) := (kernel_is_iso_comp _ _)
     _ ≅ kernel (cokernel.π f) := kernel_comp_mono _ _
-    
 #align category_theory.abelian_of_adjunction.coimage_iso_image_aux CategoryTheory.AbelianOfAdjunction.coimageIsoImageAux
 
 variable [Functor.PreservesZeroMorphisms F]
@@ -158,7 +156,6 @@ def coimageIsoImage {X Y : C} (f : X ⟶ Y) : Abelian.coimage f ≅ Abelian.imag
     _ ≅ kernel (G.map (cokernel.π (F.map f))) := (preserves_kernel.iso _ _)
     _ ≅ kernel (cokernel.π f) := (coimage_iso_image_aux F G i adj f)
     _ ≅ abelian.image f := iso.refl _
-    
 #align category_theory.abelian_of_adjunction.coimage_iso_image CategoryTheory.AbelianOfAdjunction.coimageIsoImage
 -/

ef553359

bump to nightly-2023-06-01-16

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

b9c87c70

Diff

@@ -67,7 +67,7 @@ theorem hasKernels [PreservesFiniteLimits G] : HasKernels C :=
   {
     HasLimit := fun X Y f => by
       have := nat_iso.naturality_1 i f
-      simp at this
+      simp at this 
       rw [← this]
       haveI : has_kernel (G.map (F.map f) ≫ i.hom.app _) := limits.has_kernel_comp_mono _ _
       apply limits.has_kernel_iso_comp }
@@ -84,7 +84,7 @@ theorem hasCokernels : HasCokernels C :=
       by
       haveI : preserves_colimits G := adj.left_adjoint_preserves_colimits
       have := nat_iso.naturality_1 i f
-      simp at this
+      simp at this 
       rw [← this]
       haveI : has_cokernel (G.map (F.map f) ≫ i.hom.app _) := limits.has_cokernel_comp_iso _ _
       apply limits.has_cokernel_epi_comp }

ef553359

bump to nightly-2023-05-28-06

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

ba5d8b97

Diff

@@ -93,12 +93,6 @@ theorem hasCokernels : HasCokernels C :=
 
 variable [Limits.HasCokernels C]
 
-/- warning: category_theory.abelian_of_adjunction.cokernel_iso -> CategoryTheory.AbelianOfAdjunction.cokernelIso is a dubious translation:
-lean 3 declaration is
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-but is expected to have type
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-Case conversion may be inaccurate. Consider using '#align category_theory.abelian_of_adjunction.cokernel_iso CategoryTheory.AbelianOfAdjunction.cokernelIsoₓ'. -/
 /-- Auxiliary construction for `coimage_iso_image` -/
 def cokernelIso {X Y : C} (f : X ⟶ Y) : G.obj (cokernel (F.map f)) ≅ cokernel f :=
   by
@@ -116,9 +110,6 @@ def cokernelIso {X Y : C} (f : X ⟶ Y) : G.obj (cokernel (F.map f)) ≅ cokerne
 
 variable [Limits.HasKernels C] [PreservesFiniteLimits G]
 
-/- warning: category_theory.abelian_of_adjunction.coimage_iso_image_aux -> CategoryTheory.AbelianOfAdjunction.coimageIsoImageAux is a dubious translation:
-<too large>
-Case conversion may be inaccurate. Consider using '#align category_theory.abelian_of_adjunction.coimage_iso_image_aux CategoryTheory.AbelianOfAdjunction.coimageIsoImageAuxₓ'. -/
 /-- Auxiliary construction for `coimage_iso_image` -/
 def coimageIsoImageAux {X Y : C} (f : X ⟶ Y) :
     kernel (G.map (cokernel.π (F.map f))) ≅ kernel (cokernel.π f) :=

ef553359

bump to nightly-2023-05-28-04

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

6797a637

Diff

@@ -208,13 +208,9 @@ def abelianOfAdjunction {C : Type u₁} [Category.{v} C] [Preadditive C] [HasFin
     {D : Type u₂} [Category.{v} D] [Abelian D] (F : C ⥤ D) [Functor.PreservesZeroMorphisms F]
     (G : D ⥤ C) [Functor.PreservesZeroMorphisms G] [PreservesFiniteLimits G] (i : F ⋙ G ≅ 𝟭 C)
     (adj : G ⊣ F) : Abelian C := by
-  haveI := has_kernels F G i
-  haveI := has_cokernels F G i adj
-  have : ∀ {X Y : C} (f : X ⟶ Y), is_iso (abelian.coimage_image_comparison f) :=
-    by
-    intro X Y f
-    rw [← coimage_iso_image_hom F G i adj f]
-    infer_instance
+  haveI := has_kernels F G i; haveI := has_cokernels F G i adj
+  have : ∀ {X Y : C} (f : X ⟶ Y), is_iso (abelian.coimage_image_comparison f) := by intro X Y f;
+    rw [← coimage_iso_image_hom F G i adj f]; infer_instance
   apply abelian.of_coimage_image_comparison_is_iso
 #align category_theory.abelian_of_adjunction CategoryTheory.abelianOfAdjunction
 -/

ef553359

bump to nightly-2023-05-28-03

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

6c6011cf

Diff

@@ -117,10 +117,7 @@ def cokernelIso {X Y : C} (f : X ⟶ Y) : G.obj (cokernel (F.map f)) ≅ cokerne
 variable [Limits.HasKernels C] [PreservesFiniteLimits G]
 
 /- warning: category_theory.abelian_of_adjunction.coimage_iso_image_aux -> CategoryTheory.AbelianOfAdjunction.coimageIsoImageAux is a dubious translation:
-lean 3 declaration is
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+<too large>
 Case conversion may be inaccurate. Consider using '#align category_theory.abelian_of_adjunction.coimage_iso_image_aux CategoryTheory.AbelianOfAdjunction.coimageIsoImageAuxₓ'. -/
 /-- Auxiliary construction for `coimage_iso_image` -/
 def coimageIsoImageAux {X Y : C} (f : X ⟶ Y) :

ef553359

bump to nightly-2023-05-03-02

mathlib commit https://github.com/leanprover-community/mathlib/commit/36b8aa61ea7c05727161f96a0532897bd72aedab

5ced3cdd

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Scott Morrison
 
 ! This file was ported from Lean 3 source module category_theory.abelian.transfer
-! leanprover-community/mathlib commit 70fd9563a21e7b963887c9360bd29b2393e6225a
+! leanprover-community/mathlib commit ef55335933293309ff8c0b1d20ffffeecbe5c39f
 ! 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.Adjunction.Limits
 /-!
 # Transferring "abelian-ness" across a functor
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 If `C` is an additive category, `D` is an abelian category,
 we have `F : C ⥤ D` `G : D ⥤ C` (both preserving zero morphisms),
 `G` is left exact (that is, preserves finite limits),

70fd9563

bump to nightly-2023-04-29-16

mathlib commit https://github.com/leanprover-community/mathlib/commit/a4f99eae998680d3a2c240da4a2b16354c85ee49

742d9611

Diff

@@ -58,6 +58,7 @@ variable (i : F ⋙ G ≅ 𝟭 C) (adj : G ⊣ F)
 
 include i
 
+#print CategoryTheory.AbelianOfAdjunction.hasKernels /-
 /-- No point making this an instance, as it requires `i`. -/
 theorem hasKernels [PreservesFiniteLimits G] : HasKernels C :=
   {
@@ -68,9 +69,11 @@ theorem hasKernels [PreservesFiniteLimits G] : HasKernels C :=
       haveI : has_kernel (G.map (F.map f) ≫ i.hom.app _) := limits.has_kernel_comp_mono _ _
       apply limits.has_kernel_iso_comp }
 #align category_theory.abelian_of_adjunction.has_kernels CategoryTheory.AbelianOfAdjunction.hasKernels
+-/
 
 include adj
 
+#print CategoryTheory.AbelianOfAdjunction.hasCokernels /-
 /-- No point making this an instance, as it requires `i` and `adj`. -/
 theorem hasCokernels : HasCokernels C :=
   {
@@ -83,9 +86,16 @@ theorem hasCokernels : HasCokernels C :=
       haveI : has_cokernel (G.map (F.map f) ≫ i.hom.app _) := limits.has_cokernel_comp_iso _ _
       apply limits.has_cokernel_epi_comp }
 #align category_theory.abelian_of_adjunction.has_cokernels CategoryTheory.AbelianOfAdjunction.hasCokernels
+-/
 
 variable [Limits.HasCokernels C]
 
+/- warning: category_theory.abelian_of_adjunction.cokernel_iso -> CategoryTheory.AbelianOfAdjunction.cokernelIso is a dubious translation:
+lean 3 declaration is
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+Case conversion may be inaccurate. Consider using '#align category_theory.abelian_of_adjunction.cokernel_iso CategoryTheory.AbelianOfAdjunction.cokernelIsoₓ'. -/
 /-- Auxiliary construction for `coimage_iso_image` -/
 def cokernelIso {X Y : C} (f : X ⟶ Y) : G.obj (cokernel (F.map f)) ≅ cokernel f :=
   by
@@ -103,6 +113,12 @@ def cokernelIso {X Y : C} (f : X ⟶ Y) : G.obj (cokernel (F.map f)) ≅ cokerne
 
 variable [Limits.HasKernels C] [PreservesFiniteLimits G]
 
+/- warning: category_theory.abelian_of_adjunction.coimage_iso_image_aux -> CategoryTheory.AbelianOfAdjunction.coimageIsoImageAux is a dubious translation:
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(CategoryTheory.CategoryStruct.toQuiver.{u1, u2} C (CategoryTheory.Category.toCategoryStruct.{u1, u2} C _inst_1)) D (CategoryTheory.CategoryStruct.toQuiver.{u1, u3} D (CategoryTheory.Category.toCategoryStruct.{u1, u3} D _inst_3)) (CategoryTheory.Functor.toPrefunctor.{u1, u1, u2, u3} C _inst_1 D _inst_3 F) X Y f)))))))))) (CategoryTheory.Limits.kernel.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) Y (CategoryTheory.Limits.cokernel.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y f (CategoryTheory.Limits.HasCokernels.has_colimit.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) _inst_6 X Y f)) (CategoryTheory.Limits.cokernel.π.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y f (CategoryTheory.Limits.HasCokernels.has_colimit.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) _inst_6 X Y f)) (CategoryTheory.Limits.HasKernels.has_limit.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) _inst_7 Y (CategoryTheory.Limits.cokernel.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y f (CategoryTheory.Limits.HasCokernels.has_colimit.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) _inst_6 X Y f)) (CategoryTheory.Limits.cokernel.π.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) X Y f (CategoryTheory.Limits.HasCokernels.has_colimit.{u1, u2} C _inst_1 (CategoryTheory.Preadditive.preadditiveHasZeroMorphisms.{u1, u2} C _inst_1 _inst_2) _inst_6 X Y f)))))
+Case conversion may be inaccurate. Consider using '#align category_theory.abelian_of_adjunction.coimage_iso_image_aux CategoryTheory.AbelianOfAdjunction.coimageIsoImageAuxₓ'. -/
 /-- Auxiliary construction for `coimage_iso_image` -/
 def coimageIsoImageAux {X Y : C} (f : X ⟶ Y) :
     kernel (G.map (cokernel.π (F.map f))) ≅ kernel (cokernel.π f) :=
@@ -131,6 +147,7 @@ def coimageIsoImageAux {X Y : C} (f : X ⟶ Y) :
 
 variable [Functor.PreservesZeroMorphisms F]
 
+#print CategoryTheory.AbelianOfAdjunction.coimageIsoImage /-
 /-- Auxiliary definition: the abelian coimage and abelian image agree.
 We still need to check that this agrees with the canonical morphism.
 -/
@@ -152,9 +169,11 @@ def coimageIsoImage {X Y : C} (f : X ⟶ Y) : Abelian.coimage f ≅ Abelian.imag
     _ ≅ abelian.image f := iso.refl _
     
 #align category_theory.abelian_of_adjunction.coimage_iso_image CategoryTheory.AbelianOfAdjunction.coimageIsoImage
+-/
 
 attribute [local simp] cokernel_iso coimage_iso_image coimage_iso_image_aux
 
+#print CategoryTheory.AbelianOfAdjunction.coimageIsoImage_hom /-
 -- The account of this proof in the Stacks project omits this calculation.
 theorem coimageIsoImage_hom {X Y : C} (f : X ⟶ Y) :
     (coimageIsoImage F G i adj f).Hom = Abelian.coimageImageComparison f :=
@@ -170,11 +189,13 @@ theorem coimageIsoImage_hom {X Y : C} (f : X ⟶ Y) :
     kernel_comparison_comp_ι_assoc, abelian.coimage_image_factorisation] using
     nat_iso.naturality_1 i f
 #align category_theory.abelian_of_adjunction.coimage_iso_image_hom CategoryTheory.AbelianOfAdjunction.coimageIsoImage_hom
+-/
 
 end AbelianOfAdjunction
 
 open AbelianOfAdjunction
 
+#print CategoryTheory.abelianOfAdjunction /-
 /-- If `C` is an additive category, `D` is an abelian category,
 we have `F : C ⥤ D` `G : D ⥤ C` (both preserving zero morphisms),
 `G` is left exact (that is, preserves finite limits),
@@ -196,7 +217,9 @@ def abelianOfAdjunction {C : Type u₁} [Category.{v} C] [Preadditive C] [HasFin
     infer_instance
   apply abelian.of_coimage_image_comparison_is_iso
 #align category_theory.abelian_of_adjunction CategoryTheory.abelianOfAdjunction
+-/
 
+#print CategoryTheory.abelianOfEquivalence /-
 /-- If `C` is an additive category equivalent to an abelian category `D`
 via a functor that preserves zero morphisms,
 then `C` is also abelian.
@@ -206,6 +229,7 @@ def abelianOfEquivalence {C : Type u₁} [Category.{v} C] [Preadditive C] [HasFi
     [IsEquivalence F] : Abelian C :=
   abelianOfAdjunction F F.inv F.asEquivalence.unitIso.symm F.asEquivalence.symm.toAdjunction
 #align category_theory.abelian_of_equivalence CategoryTheory.abelianOfEquivalence
+-/
 
 end CategoryTheory

70fd9563

bump to nightly-2023-03-01-20

mathlib commit https://github.com/leanprover-community/mathlib/commit/4c586d291f189eecb9d00581aeb3dd998ac34442

20cadee0

Diff

@@ -95,8 +95,8 @@ def cokernelIso {X Y : C} (f : X ⟶ Y) : G.obj (cokernel (F.map f)) ≅ cokerne
   calc
     G.obj (cokernel (F.map f)) ≅ cokernel (G.map (F.map f)) :=
       (as_iso (cokernel_comparison _ G)).symm
-    _ ≅ cokernel (_ ≫ f ≫ _) := cokernel_iso_of_eq (nat_iso.naturality_2 i f).symm
-    _ ≅ cokernel (f ≫ _) := cokernel_epi_comp _ _
+    _ ≅ cokernel (_ ≫ f ≫ _) := (cokernel_iso_of_eq (nat_iso.naturality_2 i f).symm)
+    _ ≅ cokernel (f ≫ _) := (cokernel_epi_comp _ _)
     _ ≅ cokernel f := cokernel_comp_is_iso _ _
     
 #align category_theory.abelian_of_adjunction.cokernel_iso CategoryTheory.AbelianOfAdjunction.cokernelIso
@@ -112,19 +112,19 @@ def coimageIsoImageAux {X Y : C} (f : X ⟶ Y) :
     kernel (G.map (cokernel.π (F.map f))) ≅
         kernel (cokernel.π (G.map (F.map f)) ≫ cokernel_comparison (F.map f) G) :=
       kernel_iso_of_eq (π_comp_cokernel_comparison _ _).symm
-    _ ≅ kernel (cokernel.π (G.map (F.map f))) := kernel_comp_mono _ _
+    _ ≅ kernel (cokernel.π (G.map (F.map f))) := (kernel_comp_mono _ _)
     _ ≅ kernel (cokernel.π (_ ≫ f ≫ _) ≫ (cokernel_iso_of_eq _).Hom) :=
-      kernel_iso_of_eq (π_comp_cokernel_iso_of_eq_hom (nat_iso.naturality_2 i f)).symm
-    _ ≅ kernel (cokernel.π (_ ≫ f ≫ _)) := kernel_comp_mono _ _
+      (kernel_iso_of_eq (π_comp_cokernel_iso_of_eq_hom (nat_iso.naturality_2 i f)).symm)
+    _ ≅ kernel (cokernel.π (_ ≫ f ≫ _)) := (kernel_comp_mono _ _)
     _ ≅ kernel (cokernel.π (f ≫ i.inv.app Y) ≫ (cokernel_epi_comp (i.hom.app X) _).inv) :=
-      kernel_iso_of_eq (by simp only [cokernel.π_desc, cokernel_epi_comp_inv])
-    _ ≅ kernel (cokernel.π (f ≫ _)) := kernel_comp_mono _ _
+      (kernel_iso_of_eq (by simp only [cokernel.π_desc, cokernel_epi_comp_inv]))
+    _ ≅ kernel (cokernel.π (f ≫ _)) := (kernel_comp_mono _ _)
     _ ≅ kernel (inv (i.inv.app Y) ≫ cokernel.π f ≫ (cokernel_comp_is_iso f (i.inv.app Y)).inv) :=
-      kernel_iso_of_eq
+      (kernel_iso_of_eq
         (by
           simp only [cokernel.π_desc, cokernel_comp_is_iso_inv, iso.hom_inv_id_app_assoc,
-            nat_iso.inv_inv_app])
-    _ ≅ kernel (cokernel.π f ≫ _) := kernel_is_iso_comp _ _
+            nat_iso.inv_inv_app]))
+    _ ≅ kernel (cokernel.π f ≫ _) := (kernel_is_iso_comp _ _)
     _ ≅ kernel (cokernel.π f) := kernel_comp_mono _ _
     
 #align category_theory.abelian_of_adjunction.coimage_iso_image_aux CategoryTheory.AbelianOfAdjunction.coimageIsoImageAux
@@ -142,13 +142,13 @@ def coimageIsoImage {X Y : C} (f : X ⟶ Y) : Abelian.coimage f ≅ Abelian.imag
     abelian.coimage f ≅ cokernel (kernel.ι f) := iso.refl _
     _ ≅ G.obj (cokernel (F.map (kernel.ι f))) := (cokernel_iso _ _ i adj _).symm
     _ ≅ G.obj (cokernel (kernel_comparison f F ≫ kernel.ι (F.map f))) :=
-      G.map_iso (cokernel_iso_of_eq (by simp))
-    _ ≅ G.obj (cokernel (kernel.ι (F.map f))) := G.map_iso (cokernel_epi_comp _ _)
-    _ ≅ G.obj (abelian.coimage (F.map f)) := iso.refl _
-    _ ≅ G.obj (abelian.image (F.map f)) := G.map_iso (abelian.coimage_iso_image _)
-    _ ≅ G.obj (kernel (cokernel.π (F.map f))) := iso.refl _
-    _ ≅ kernel (G.map (cokernel.π (F.map f))) := preserves_kernel.iso _ _
-    _ ≅ kernel (cokernel.π f) := coimage_iso_image_aux F G i adj f
+      (G.map_iso (cokernel_iso_of_eq (by simp)))
+    _ ≅ G.obj (cokernel (kernel.ι (F.map f))) := (G.map_iso (cokernel_epi_comp _ _))
+    _ ≅ G.obj (abelian.coimage (F.map f)) := (iso.refl _)
+    _ ≅ G.obj (abelian.image (F.map f)) := (G.map_iso (abelian.coimage_iso_image _))
+    _ ≅ G.obj (kernel (cokernel.π (F.map f))) := (iso.refl _)
+    _ ≅ kernel (G.map (cokernel.π (F.map f))) := (preserves_kernel.iso _ _)
+    _ ≅ kernel (cokernel.π f) := (coimage_iso_image_aux F G i adj f)
     _ ≅ abelian.image f := iso.refl _
     
 #align category_theory.abelian_of_adjunction.coimage_iso_image CategoryTheory.AbelianOfAdjunction.coimageIsoImage

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

chore: superfluous parentheses part 2 (#12131)

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

d48d30ac

Diff

@@ -97,18 +97,18 @@ def coimageIsoImageAux {X Y : C} (f : X ⟶ Y) :
     kernel (G.map (cokernel.π (F.map f))) ≅
         kernel (cokernel.π (G.map (F.map f)) ≫ cokernelComparison (F.map f) G) :=
       kernelIsoOfEq (π_comp_cokernelComparison _ _).symm
-    _ ≅ kernel (cokernel.π (G.map (F.map f))) := (kernelCompMono _ _)
+    _ ≅ kernel (cokernel.π (G.map (F.map f))) := kernelCompMono _ _
     _ ≅ kernel (cokernel.π (_ ≫ f ≫ _) ≫ (cokernelIsoOfEq _).hom) :=
       (kernelIsoOfEq (π_comp_cokernelIsoOfEq_hom (NatIso.naturality_2 i f)).symm)
-    _ ≅ kernel (cokernel.π (_ ≫ f ≫ _)) := (kernelCompMono _ _)
+    _ ≅ kernel (cokernel.π (_ ≫ f ≫ _)) := kernelCompMono _ _
     _ ≅ kernel (cokernel.π (f ≫ i.inv.app Y) ≫ (cokernelEpiComp (i.hom.app X) _).inv) :=
       (kernelIsoOfEq (by simp only [cokernel.π_desc, cokernelEpiComp_inv]))
-    _ ≅ kernel (cokernel.π (f ≫ _)) := (kernelCompMono _ _)
+    _ ≅ kernel (cokernel.π (f ≫ _)) := kernelCompMono _ _
     _ ≅ kernel (inv (i.inv.app Y) ≫ cokernel.π f ≫ (cokernelCompIsIso f (i.inv.app Y)).inv) :=
       (kernelIsoOfEq
         (by simp only [cokernel.π_desc, cokernelCompIsIso_inv, Iso.hom_inv_id_app_assoc,
           NatIso.inv_inv_app]))
-    _ ≅ kernel (cokernel.π f ≫ _) := (kernelIsIsoComp _ _)
+    _ ≅ kernel (cokernel.π f ≫ _) := kernelIsIsoComp _ _
     _ ≅ kernel (cokernel.π f) := kernelCompMono _ _
 #align category_theory.abelian_of_adjunction.coimage_iso_image_aux CategoryTheory.AbelianOfAdjunction.coimageIsoImageAux
 
@@ -124,12 +124,12 @@ def coimageIsoImage {X Y : C} (f : X ⟶ Y) : Abelian.coimage f ≅ Abelian.imag
     _ ≅ G.obj (cokernel (F.map (kernel.ι f))) := (cokernelIso _ _ i adj _).symm
     _ ≅ G.obj (cokernel (kernelComparison f F ≫ kernel.ι (F.map f))) :=
       (G.mapIso (cokernelIsoOfEq (by simp)))
-    _ ≅ G.obj (cokernel (kernel.ι (F.map f))) := (G.mapIso (cokernelEpiComp _ _))
-    _ ≅ G.obj (Abelian.coimage (F.map f)) := (Iso.refl _)
-    _ ≅ G.obj (Abelian.image (F.map f)) := (G.mapIso (Abelian.coimageIsoImage _))
-    _ ≅ G.obj (kernel (cokernel.π (F.map f))) := (Iso.refl _)
-    _ ≅ kernel (G.map (cokernel.π (F.map f))) := (PreservesKernel.iso _ _)
-    _ ≅ kernel (cokernel.π f) := (coimageIsoImageAux F G i adj f)
+    _ ≅ G.obj (cokernel (kernel.ι (F.map f))) := G.mapIso (cokernelEpiComp _ _)
+    _ ≅ G.obj (Abelian.coimage (F.map f)) := Iso.refl _
+    _ ≅ G.obj (Abelian.image (F.map f)) := G.mapIso (Abelian.coimageIsoImage _)
+    _ ≅ G.obj (kernel (cokernel.π (F.map f))) := Iso.refl _
+    _ ≅ kernel (G.map (cokernel.π (F.map f))) := PreservesKernel.iso _ _
+    _ ≅ kernel (cokernel.π f) := coimageIsoImageAux F G i adj f
     _ ≅ Abelian.image f := Iso.refl _
 #align category_theory.abelian_of_adjunction.coimage_iso_image CategoryTheory.AbelianOfAdjunction.coimageIsoImage

70fd9563

chore(CategoryTheory): move Full, Faithful, EssSurj, IsEquivalence and ReflectsIsomorphisms to the Functor namespace (#11985)

These notions on functors are now Functor.Full, Functor.Faithful, Functor.EssSurj, Functor.IsEquivalence, Functor.ReflectsIsomorphisms. Deprecated aliases are introduced for the previous names.

65b7affc

Diff

@@ -179,7 +179,7 @@ then `C` is also abelian.
 -/
 def abelianOfEquivalence {C : Type u₁} [Category.{v} C] [Preadditive C] [HasFiniteProducts C]
     {D : Type u₂} [Category.{v} D] [Abelian D] (F : C ⥤ D) [Functor.PreservesZeroMorphisms F]
-    [IsEquivalence F] : Abelian C :=
+    [F.IsEquivalence] : Abelian C :=
   abelianOfAdjunction F F.inv F.asEquivalence.unitIso.symm F.asEquivalence.symm.toAdjunction
 #align category_theory.abelian_of_equivalence CategoryTheory.abelianOfEquivalence

70fd9563

chore(*): remove empty lines between variable statements (#11418)

Empty lines were removed by executing the following Python script twice

import os
import re


# Loop through each file in the repository
for dir_path, dirs, files in os.walk('.'):
  for filename in files:
    if filename.endswith('.lean'):
      file_path = os.path.join(dir_path, filename)

      # Open the file and read its contents
      with open(file_path, 'r') as file:
        content = file.read()

      # Use a regular expression to replace sequences of "variable" lines separated by empty lines
      # with sequences without empty lines
      modified_content = re.sub(r'(variable.*\n)\n(variable(?! .* in))', r'\1\2', content)

      # Write the modified content back to the file
      with open(file_path, 'w') as file:
        file.write(modified_content)

75c86f04

Diff

@@ -44,13 +44,9 @@ universe v u₁ u₂
 namespace AbelianOfAdjunction
 
 variable {C : Type u₁} [Category.{v} C] [Preadditive C]
-
 variable {D : Type u₂} [Category.{v} D] [Abelian D]
-
 variable (F : C ⥤ D)
-
 variable (G : D ⥤ C) [Functor.PreservesZeroMorphisms G]
-
 variable (i : F ⋙ G ≅ 𝟭 C) (adj : G ⊣ F)
 
 /-- No point making this an instance, as it requires `i`. -/

70fd9563

perf (Abelian.Transfer): clean up a dsimp (#9641)

Cleaning up a dsimp improves performance.

Co-authored-by: Matthew Robert Ballard <100034030+mattrobball@users.noreply.github.com>

40e48773

Diff

@@ -83,8 +83,6 @@ def cokernelIso {X Y : C} (f : X ⟶ Y) : G.obj (cokernel (F.map f)) ≅ cokerne
   -- We have to write an explicit `PreservesColimits` type here,
   -- as `leftAdjointPreservesColimits` has universe variables.
   have : PreservesColimits G := adj.leftAdjointPreservesColimits
-  -- porting note: the next `have` has been added, otherwise some instance were not found
-  have : ∀ (X' Y' : C) (f' : X' ⟶ Y'), HasCokernel f' := inferInstance
   calc
     G.obj (cokernel (F.map f)) ≅ cokernel (G.map (F.map f)) :=
       (asIso (cokernelComparison _ G)).symm
@@ -99,8 +97,6 @@ variable [Limits.HasKernels C] [PreservesFiniteLimits G]
 def coimageIsoImageAux {X Y : C} (f : X ⟶ Y) :
     kernel (G.map (cokernel.π (F.map f))) ≅ kernel (cokernel.π f) := by
   have : PreservesColimits G := adj.leftAdjointPreservesColimits
-  -- porting note: the next `have` has been added, otherwise some instance were not found
-  have : ∀ (X' Y' : C) (f' : X' ⟶ Y'), HasCokernel f' := inferInstance
   calc
     kernel (G.map (cokernel.π (F.map f))) ≅
         kernel (cokernel.π (G.map (F.map f)) ≫ cokernelComparison (F.map f) G) :=
@@ -127,8 +123,6 @@ We still need to check that this agrees with the canonical morphism.
 -/
 def coimageIsoImage {X Y : C} (f : X ⟶ Y) : Abelian.coimage f ≅ Abelian.image f := by
   have : PreservesLimits F := adj.rightAdjointPreservesLimits
-  -- porting note: the next `have` has been added, otherwise some instance were not found
-  haveI : ∀ (X' Y' : D) (f' : X' ⟶ Y'), HasCokernel f' := inferInstance
   calc
     Abelian.coimage f ≅ cokernel (kernel.ι f) := Iso.refl _
     _ ≅ G.obj (cokernel (F.map (kernel.ι f))) := (cokernelIso _ _ i adj _).symm
@@ -144,17 +138,10 @@ def coimageIsoImage {X Y : C} (f : X ⟶ Y) : Abelian.coimage f ≅ Abelian.imag
 #align category_theory.abelian_of_adjunction.coimage_iso_image CategoryTheory.AbelianOfAdjunction.coimageIsoImage
 
 -- The account of this proof in the Stacks project omits this calculation.
-@[nolint unusedHavesSuffices]
 theorem coimageIsoImage_hom {X Y : C} (f : X ⟶ Y) :
     (coimageIsoImage F G i adj f).hom = Abelian.coimageImageComparison f := by
-  -- porting note: the next `have` have been added, otherwise some instance were not found
-  have : ∀ (X' Y' : C) (f' : X' ⟶ Y'), HasCokernel f' := inferInstance
-  have : ∀ (X' Y' : C) (f' : X' ⟶ Y'), HasKernel f' := inferInstance
-  have : ∀ (X' Y' : D) (f' : X' ⟶ Y'), HasCokernel f' := inferInstance
-  have : ∀ (X' Y' : D) (f' : X' ⟶ Y'), HasKernel f' := inferInstance
-  dsimp only [coimageIsoImage, Iso.instTransIso_trans, Iso.refl, Iso.trans, Iso.symm,
-    Functor.mapIso, cokernelEpiComp, cokernelIso, cokernelCompIsIso_inv,
-    asIso, coimageIsoImageAux, kernelCompMono]
+  dsimp [coimageIsoImage, cokernelIso, cokernelEpiComp, cokernelCompIsIso_inv,
+    coimageIsoImageAux, kernelCompMono]
   simpa only [← cancel_mono (Abelian.image.ι f), ← cancel_epi (Abelian.coimage.π f),
     Category.assoc, Category.id_comp, cokernel.π_desc_assoc,
     π_comp_cokernelIsoOfEq_inv_assoc, PreservesKernel.iso_hom,

70fd9563

chore: Remove nonterminal simp at (#7795)

Removes nonterminal uses of simp at. Replaces most of these with instances of simp? ... says.

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

4160b2aa

Diff

@@ -57,7 +57,8 @@ variable (i : F ⋙ G ≅ 𝟭 C) (adj : G ⊣ F)
 theorem hasKernels [PreservesFiniteLimits G] : HasKernels C :=
   { has_limit := fun f => by
       have := NatIso.naturality_1 i f
-      simp at this
+      simp? at this says
+        simp only [Functor.id_obj, Functor.comp_obj, Functor.comp_map, Functor.id_map] at this
       rw [← this]
       haveI : HasKernel (G.map (F.map f) ≫ i.hom.app _) := Limits.hasKernel_comp_mono _ _
       apply Limits.hasKernel_iso_comp }
@@ -68,7 +69,8 @@ theorem hasCokernels : HasCokernels C :=
   { has_colimit := fun f => by
       have : PreservesColimits G := adj.leftAdjointPreservesColimits
       have := NatIso.naturality_1 i f
-      simp at this
+      simp? at this says
+        simp only [Functor.id_obj, Functor.comp_obj, Functor.comp_map, Functor.id_map] at this
       rw [← this]
       haveI : HasCokernel (G.map (F.map f) ≫ i.hom.app _) := Limits.hasCokernel_comp_iso _ _
       apply Limits.hasCokernel_epi_comp }

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

@@ -2,16 +2,13 @@
 Copyright (c) 2022 Scott Morrison. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Scott Morrison
-
-! This file was ported from Lean 3 source module category_theory.abelian.transfer
-! 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.Abelian.Basic
 import Mathlib.CategoryTheory.Limits.Preserves.Shapes.Kernels
 import Mathlib.CategoryTheory.Adjunction.Limits
 
+#align_import category_theory.abelian.transfer from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225a"
+
 /-!
 # Transferring "abelian-ness" across a functor

70fd9563

chore: fix typos (#4518)

I ran codespell Mathlib and got tired halfway through the suggestions.

92beef58

Diff

@@ -25,7 +25,7 @@ See <https://stacks.math.columbia.edu/tag/03A3>
 
 ## Notes
 The hypotheses, following the statement from the Stacks project,
-may appear suprising: we don't ask that the counit of the adjunction is an isomorphism,
+may appear surprising: we don't ask that the counit of the adjunction is an isomorphism,
 but just that we have some potentially unrelated isomorphism `i : F ⋙ G ≅ 𝟭 C`.
 
 However Lemma A1.1.1 from [Elephant] shows that in this situation the counit itself

70fd9563

feat: port CategoryTheory.Abelian.Transfer (#3424)

6a35632a

`category_theory.abelian.transfer` ⟷ `Mathlib.CategoryTheory.Abelian.Transfer`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 3 + 314

category_theory.abelian.transfer ⟷ Mathlib.CategoryTheory.Abelian.Transfer

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 3 + 314

`category_theory.abelian.transfer` ⟷ `Mathlib.CategoryTheory.Abelian.Transfer`