algebra.category.Group.zero | 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

31ca6f9c

bump to nightly-2024-04-06-08

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

e34029c9

Diff

@@ -3,7 +3,7 @@ Copyright (c) 2020 Scott Morrison. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Scott Morrison
 -/
-import Algebra.Category.Group.Basic
+import Algebra.Category.GroupCat.Basic
 import CategoryTheory.Limits.Shapes.ZeroObjects
 
 #align_import algebra.category.Group.zero from "leanprover-community/mathlib"@"31ca6f9cf5f90a6206092cd7f84b359dcb6d52e0"

31ca6f9c

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) 2020 Scott Morrison. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Scott Morrison
 -/
-import Mathbin.Algebra.Category.Group.Basic
-import Mathbin.CategoryTheory.Limits.Shapes.ZeroObjects
+import Algebra.Category.Group.Basic
+import CategoryTheory.Limits.Shapes.ZeroObjects
 
 #align_import algebra.category.Group.zero from "leanprover-community/mathlib"@"31ca6f9cf5f90a6206092cd7f84b359dcb6d52e0"

31ca6f9c

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) 2020 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 algebra.category.Group.zero
-! leanprover-community/mathlib commit 31ca6f9cf5f90a6206092cd7f84b359dcb6d52e0
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.Algebra.Category.Group.Basic
 import Mathbin.CategoryTheory.Limits.Shapes.ZeroObjects
 
+#align_import algebra.category.Group.zero from "leanprover-community/mathlib"@"31ca6f9cf5f90a6206092cd7f84b359dcb6d52e0"
+
 /-!
 # The category of (commutative) (additive) groups has a zero object.

31ca6f9c

bump to nightly-2023-05-28-04

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

6797a637

Diff

@@ -35,11 +35,8 @@ namespace GroupCat
 theorem isZero_of_subsingleton (G : GroupCat) [Subsingleton G] : IsZero G :=
   by
   refine' ⟨fun X => ⟨⟨⟨1⟩, fun f => _⟩⟩, fun X => ⟨⟨⟨1⟩, fun f => _⟩⟩⟩
-  · ext
-    have : x = 1 := Subsingleton.elim _ _
-    rw [this, map_one, map_one]
-  · ext
-    apply Subsingleton.elim
+  · ext; have : x = 1 := Subsingleton.elim _ _; rw [this, map_one, map_one]
+  · ext; apply Subsingleton.elim
 #align Group.is_zero_of_subsingleton GroupCat.isZero_of_subsingleton
 #align AddGroup.is_zero_of_subsingleton AddGroupCat.isZero_of_subsingleton
 -/
@@ -57,11 +54,8 @@ namespace CommGroupCat
 theorem isZero_of_subsingleton (G : CommGroupCat) [Subsingleton G] : IsZero G :=
   by
   refine' ⟨fun X => ⟨⟨⟨1⟩, fun f => _⟩⟩, fun X => ⟨⟨⟨1⟩, fun f => _⟩⟩⟩
-  · ext
-    have : x = 1 := Subsingleton.elim _ _
-    rw [this, map_one, map_one]
-  · ext
-    apply Subsingleton.elim
+  · ext; have : x = 1 := Subsingleton.elim _ _; rw [this, map_one, map_one]
+  · ext; apply Subsingleton.elim
 #align CommGroup.is_zero_of_subsingleton CommGroupCat.isZero_of_subsingleton
 #align AddCommGroup.is_zero_of_subsingleton AddCommGroupCat.isZero_of_subsingleton
 -/

31ca6f9c

bump to nightly-2023-04-04-02

mathlib commit https://github.com/leanprover-community/mathlib/commit/3cacc945118c8c637d89950af01da78307f59325

2ee17135

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 algebra.category.Group.zero
-! leanprover-community/mathlib commit 70fd9563a21e7b963887c9360bd29b2393e6225a
+! leanprover-community/mathlib commit 31ca6f9cf5f90a6206092cd7f84b359dcb6d52e0
 ! Please do not edit these lines, except to modify the commit id
 ! if you have ported upstream changes.
 -/
@@ -14,6 +14,9 @@ import Mathbin.CategoryTheory.Limits.Shapes.ZeroObjects
 /-!
 # The category of (commutative) (additive) groups has a zero object.
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 `AddCommGroup` also has zero morphisms. For definitional reasons, we infer this from preadditivity
 rather than from the existence of a zero object.
 -/

70fd9563

bump to nightly-2023-03-26-10

mathlib commit https://github.com/leanprover-community/mathlib/commit/55d771df074d0dd020139ee1cd4b95521422df9f

bd810858

Diff

@@ -27,6 +27,7 @@ universe u
 
 namespace GroupCat
 
+#print GroupCat.isZero_of_subsingleton /-
 @[to_additive]
 theorem isZero_of_subsingleton (G : GroupCat) [Subsingleton G] : IsZero G :=
   by
@@ -38,6 +39,7 @@ theorem isZero_of_subsingleton (G : GroupCat) [Subsingleton G] : IsZero G :=
     apply Subsingleton.elim
 #align Group.is_zero_of_subsingleton GroupCat.isZero_of_subsingleton
 #align AddGroup.is_zero_of_subsingleton AddGroupCat.isZero_of_subsingleton
+-/
 
 @[to_additive AddGroupCat.hasZeroObject]
 instance : HasZeroObject GroupCat :=
@@ -47,6 +49,7 @@ end GroupCat
 
 namespace CommGroupCat
 
+#print CommGroupCat.isZero_of_subsingleton /-
 @[to_additive]
 theorem isZero_of_subsingleton (G : CommGroupCat) [Subsingleton G] : IsZero G :=
   by
@@ -58,6 +61,7 @@ theorem isZero_of_subsingleton (G : CommGroupCat) [Subsingleton G] : IsZero G :=
     apply Subsingleton.elim
 #align CommGroup.is_zero_of_subsingleton CommGroupCat.isZero_of_subsingleton
 #align AddCommGroup.is_zero_of_subsingleton AddCommGroupCat.isZero_of_subsingleton
+-/
 
 @[to_additive AddCommGroupCat.hasZeroObject]
 instance : HasZeroObject CommGroupCat :=

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: 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

@@ -2,15 +2,12 @@
 Copyright (c) 2020 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 algebra.category.Group.zero
-! 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.Algebra.Category.GroupCat.Basic
 import Mathlib.CategoryTheory.Limits.Shapes.ZeroObjects
 
+#align_import algebra.category.Group.zero from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225a"
+
 /-!
 # The category of (commutative) (additive) groups has a zero object.

70fd9563

chore: refactor of concrete categories (#3900)

I think the ports

https://github.com/leanprover-community/mathlib4/pull/2902 (MonCat)
https://github.com/leanprover-community/mathlib4/pull/3036 (GroupCat)
https://github.com/leanprover-community/mathlib4/pull/3260 (ModuleCat)

didn't quite get things right, and also have some variation between them. This PR tries to straighten things out.

Major changes:

Have the coercion to type be via X.\a, and put attribute @[coe] on this.

Make sure the coercion from morphisms to functions means that simp lemmas about the underlying bundled morphisms apply directly.

This means we drop lemmas like

lemma Hom.map_mul {X Y : MonCat} (f : X ⟶ Y) (x y : X) : ((forget MonCat).map f) (x * y) = f x * f y

But at the expense of adding lemmas like

lemma coe_comp {X Y Z : MonCat} {f : X ⟶ Y} {g : Y ⟶ Z} : (f ≫ g : X → Z) = g ∘ f := rfl

Overall I'm pretty happy, and it allows me to unstick the long stuck https://github.com/leanprover-community/mathlib4/pull/3105.

This is not everything I want to do to refactor these files, but once I was satisfied that I can move forward with RingCat, I want to get this merged so we can unblock porting progress. I'll promise to come back to this soon! :-)

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

237c33e0

Diff

@@ -32,7 +32,7 @@ theorem isZero_of_subsingleton (G : GroupCat) [Subsingleton G] : IsZero G := by
   refine' ⟨fun X => ⟨⟨⟨1⟩, fun f => _⟩⟩, fun X => ⟨⟨⟨1⟩, fun f => _⟩⟩⟩
   · ext x
     have : x = 1 := Subsingleton.elim _ _
-    rw [this, Hom.map_one, Hom.map_one]
+    rw [this, map_one, map_one]
   · ext
     apply Subsingleton.elim
 set_option linter.uppercaseLean3 false in
@@ -53,7 +53,7 @@ theorem isZero_of_subsingleton (G : CommGroupCat) [Subsingleton G] : IsZero G :=
   refine' ⟨fun X => ⟨⟨⟨1⟩, fun f => _⟩⟩, fun X => ⟨⟨⟨1⟩, fun f => _⟩⟩⟩
   · ext x
     have : x = 1 := Subsingleton.elim _ _
-    rw [this, Hom.map_one, Hom.map_one]
+    rw [this, map_one, map_one]
   · ext
     apply Subsingleton.elim
 set_option linter.uppercaseLean3 false in

70fd9563

feat: port Algebra.Category.GroupCat.Zero (#3092)

Co-authored-by: Parcly Taxel <reddeloostw@gmail.com>

ea4e0dd0

`algebra.category.Group.zero` ⟷ `Mathlib.Algebra.Category.GroupCat.Zero`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 3 + 231

algebra.category.Group.zero ⟷ Mathlib.Algebra.Category.GroupCat.Zero

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 3 + 231

`algebra.category.Group.zero` ⟷ `Mathlib.Algebra.Category.GroupCat.Zero`