topology.category.Profinite.projective

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

829895f1

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

ef553359

bump to nightly-2024-03-17-08

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

22f01ce4

Diff

@@ -39,7 +39,7 @@ namespace Profinite
 #print Profinite.projective_ultrafilter /-
 instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
     where Factors Y Z f g hg := by
-    rw [epi_iff_surjective] at hg 
+    rw [epi_iff_surjective] at hg
     obtain ⟨g', hg'⟩ := hg.has_right_inverse
     let t : X → Y := g' ∘ f ∘ (pure : X → Ultrafilter X)
     let h : Ultrafilter X → Y := Ultrafilter.extend t

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) 2021 Johan Commelin. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Johan Commelin
 -/
-import Mathbin.Topology.Category.Profinite.Basic
-import Mathbin.Topology.StoneCech
-import Mathbin.CategoryTheory.Preadditive.Projective
+import Topology.Category.Profinite.Basic
+import Topology.StoneCech
+import CategoryTheory.Preadditive.Projective
 
 #align_import topology.category.Profinite.projective from "leanprover-community/mathlib"@"ef55335933293309ff8c0b1d20ffffeecbe5c39f"

ef553359

bump to nightly-2023-08-02-01

mathlib commit https://github.com/leanprover-community/mathlib/commit/63721b2c3eba6c325ecf8ae8cca27155a4f6306f

7aca3f15

Diff

@@ -44,7 +44,7 @@ instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
     let t : X → Y := g' ∘ f ∘ (pure : X → Ultrafilter X)
     let h : Ultrafilter X → Y := Ultrafilter.extend t
     have hh : Continuous h := continuous_ultrafilter_extend _
-    use ⟨h, hh⟩
+    use⟨h, hh⟩
     apply faithful.map_injective (forget Profinite)
     simp only [forget_map_eq_coe, ContinuousMap.coe_mk, coe_comp]
     refine' dense_range_pure.equalizer (g.continuous.comp hh) f.continuous _

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) 2021 Johan Commelin. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Johan Commelin
-
-! This file was ported from Lean 3 source module topology.category.Profinite.projective
-! 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.Topology.Category.Profinite.Basic
 import Mathbin.Topology.StoneCech
 import Mathbin.CategoryTheory.Preadditive.Projective
 
+#align_import topology.category.Profinite.projective from "leanprover-community/mathlib"@"ef55335933293309ff8c0b1d20ffffeecbe5c39f"
+
 /-!
 # Profinite sets have enough projectives

ef553359

bump to nightly-2023-06-01-16

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

b9c87c70

Diff

@@ -42,7 +42,7 @@ namespace Profinite
 #print Profinite.projective_ultrafilter /-
 instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
     where Factors Y Z f g hg := by
-    rw [epi_iff_surjective] at hg
+    rw [epi_iff_surjective] at hg 
     obtain ⟨g', hg'⟩ := hg.has_right_inverse
     let t : X → Y := g' ∘ f ∘ (pure : X → Ultrafilter X)
     let h : Ultrafilter X → Y := Ultrafilter.extend t

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: Johan Commelin
 
 ! This file was ported from Lean 3 source module topology.category.Profinite.projective
-! leanprover-community/mathlib commit 829895f162a1f29d0133f4b3538f4cd1fb5bffd3
+! 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.Preadditive.Projective
 /-!
 # Profinite sets have enough projectives
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 In this file we show that `Profinite` has enough projectives.
 
 ## Main results

829895f1

bump to nightly-2023-05-01-16

mathlib commit https://github.com/leanprover-community/mathlib/commit/8b8ba04e2f326f3f7cf24ad129beda58531ada61

3c8f44d6

Diff

@@ -36,6 +36,7 @@ open CategoryTheory Function
 
 namespace Profinite
 
+#print Profinite.projective_ultrafilter /-
 instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
     where Factors Y Z f g hg := by
     rw [epi_iff_surjective] at hg
@@ -49,7 +50,9 @@ instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
     refine' dense_range_pure.equalizer (g.continuous.comp hh) f.continuous _
     rw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, hg'.comp_eq_id, comp.left_id]
 #align Profinite.projective_ultrafilter Profinite.projective_ultrafilter
+-/
 
+#print Profinite.projectivePresentation /-
 /-- For any profinite `X`, the natural map `ultrafilter X → X` is a projective presentation. -/
 def projectivePresentation (X : Profinite.{u}) : ProjectivePresentation X
     where
@@ -60,6 +63,7 @@ def projectivePresentation (X : Profinite.{u}) : ProjectivePresentation X
     ConcreteCategory.epi_of_surjective _ fun x =>
       ⟨(pure x : Ultrafilter X), congr_fun (ultrafilter_extend_extends (𝟙 X)) x⟩
 #align Profinite.projective_presentation Profinite.projectivePresentation
+-/
 
 instance : EnoughProjectives Profinite.{u} where presentation X := ⟨projectivePresentation X⟩

829895f1

bump to nightly-2023-02-21-16

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

1107b979

Changes in mathlib4

mathlib3

mathlib4

829895f1

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

@@ -43,7 +43,7 @@ instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
     let h : Ultrafilter X → Y := Ultrafilter.extend t
     have hh : Continuous h := continuous_ultrafilter_extend _
     use ⟨h, hh⟩
-    apply Faithful.map_injective (F := forget Profinite)
+    apply (forget Profinite).map_injective
     simp only [h, ContinuousMap.coe_mk, coe_comp]
     convert denseRange_pure.equalizer (g.continuous.comp hh) f.continuous _
      -- Porting note: same fix as in `Topology.Category.CompHaus.Projective`

829895f1

chore: more backporting of simp changes from #10995 (#11001)

Co-authored-by: Patrick Massot <patrickmassot@free.fr> Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

d9589c14

Diff

@@ -44,7 +44,7 @@ instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
     have hh : Continuous h := continuous_ultrafilter_extend _
     use ⟨h, hh⟩
     apply Faithful.map_injective (F := forget Profinite)
-    simp only [ContinuousMap.coe_mk, coe_comp]
+    simp only [h, ContinuousMap.coe_mk, coe_comp]
     convert denseRange_pure.equalizer (g.continuous.comp hh) f.continuous _
      -- Porting note: same fix as in `Topology.Category.CompHaus.Projective`
     let g'' : ContinuousMap Y Z := g

829895f1

chore(Function): rename some lemmas (#9738)

Merge Function.left_id and Function.comp.left_id into Function.id_comp.
Merge Function.right_id and Function.comp.right_id into Function.comp_id.
Merge Function.comp_const_right and Function.comp_const into Function.comp_const, use explicit arguments.
Move Function.const_comp to Mathlib.Init.Function, use explicit arguments.

87c10369

Diff

@@ -50,7 +50,7 @@ instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
     let g'' : ContinuousMap Y Z := g
     have : g'' ∘ g' = id := hg'.comp_eq_id
     -- This used to be `rw`, but we need `erw` after leanprover/lean4#2644
-    erw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
+    erw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, id_comp]
 #align Profinite.projective_ultrafilter Profinite.projective_ultrafilter
 
 /-- For any profinite `X`, the natural map `Ultrafilter X → X` is a projective presentation. -/

829895f1

Revert "chore: revert #7703 (#7710)"

This reverts commit f3695eb2.

ab56fa28

Diff

@@ -49,7 +49,8 @@ instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
      -- Porting note: same fix as in `Topology.Category.CompHaus.Projective`
     let g'' : ContinuousMap Y Z := g
     have : g'' ∘ g' = id := hg'.comp_eq_id
-    rw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
+    -- This used to be `rw`, but we need `erw` after leanprover/lean4#2644
+    erw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
 #align Profinite.projective_ultrafilter Profinite.projective_ultrafilter
 
 /-- For any profinite `X`, the natural map `Ultrafilter X → X` is a projective presentation. -/

829895f1

chore: revert #7703 (#7710)

This reverts commit 26eb2b0a.

f3695eb2

Diff

@@ -49,8 +49,7 @@ instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
      -- Porting note: same fix as in `Topology.Category.CompHaus.Projective`
     let g'' : ContinuousMap Y Z := g
     have : g'' ∘ g' = id := hg'.comp_eq_id
-    -- This used to be `rw`, but we need `erw` after leanprover/lean4#2644
-    erw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
+    rw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
 #align Profinite.projective_ultrafilter Profinite.projective_ultrafilter
 
 /-- For any profinite `X`, the natural map `Ultrafilter X → X` is a projective presentation. -/

829895f1

chore: bump toolchain to v4.2.0-rc2 (#7703)

This includes all the changes from #7606.

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

26eb2b0a

Diff

@@ -49,7 +49,8 @@ instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
      -- Porting note: same fix as in `Topology.Category.CompHaus.Projective`
     let g'' : ContinuousMap Y Z := g
     have : g'' ∘ g' = id := hg'.comp_eq_id
-    rw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
+    -- This used to be `rw`, but we need `erw` after leanprover/lean4#2644
+    erw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
 #align Profinite.projective_ultrafilter Profinite.projective_ultrafilter
 
 /-- For any profinite `X`, the natural map `Ultrafilter X → X` is a projective presentation. -/

829895f1

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) 2021 Johan Commelin. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Johan Commelin
-
-! This file was ported from Lean 3 source module topology.category.Profinite.projective
-! leanprover-community/mathlib commit 829895f162a1f29d0133f4b3538f4cd1fb5bffd3
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.Topology.Category.Profinite.Basic
 import Mathlib.Topology.StoneCech
 import Mathlib.CategoryTheory.Preadditive.Projective
 
+#align_import topology.category.Profinite.projective from "leanprover-community/mathlib"@"829895f162a1f29d0133f4b3538f4cd1fb5bffd3"
+
 /-!
 # Profinite sets have enough projectives

829895f1

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

b7cba33a

Diff

@@ -53,7 +53,6 @@ instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
     let g'' : ContinuousMap Y Z := g
     have : g'' ∘ g' = id := hg'.comp_eq_id
     rw [comp.assoc, ultrafilter_extend_extends, ← comp.assoc, this, comp.left_id]
-    rfl
 #align Profinite.projective_ultrafilter Profinite.projective_ultrafilter
 
 /-- For any profinite `X`, the natural map `Ultrafilter X → X` is a projective presentation. -/

829895f1

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

@@ -47,7 +47,7 @@ instance projective_ultrafilter (X : Type u) : Projective (of <| Ultrafilter X)
     have hh : Continuous h := continuous_ultrafilter_extend _
     use ⟨h, hh⟩
     apply Faithful.map_injective (F := forget Profinite)
-    simp only [forget_map_eq_coe, ContinuousMap.coe_mk, coe_comp]
+    simp only [ContinuousMap.coe_mk, coe_comp]
     convert denseRange_pure.equalizer (g.continuous.comp hh) f.continuous _
      -- Porting note: same fix as in `Topology.Category.CompHaus.Projective`
     let g'' : ContinuousMap Y Z := g

829895f1

feat: port Topology.Category.Profinite.Projective (#3746)

37a42762

`topology.category.Profinite.projective` ⟷ `Mathlib.Topology.Category.Profinite.Projective`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 10 + 761

topology.category.Profinite.projective ⟷ Mathlib.Topology.Category.Profinite.Projective

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 10 + 761

`topology.category.Profinite.projective` ⟷ `Mathlib.Topology.Category.Profinite.Projective`