topology.algebra.star | 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

4c19a16e

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

50832dae

bump to nightly-2023-09-24-06

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

5655435f

Diff

@@ -3,10 +3,10 @@ Copyright (c) 2022 Eric Wieser. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Eric Wieser
 -/
-import Mathbin.Algebra.Star.Pi
-import Mathbin.Algebra.Star.Prod
-import Mathbin.Topology.Algebra.Constructions
-import Mathbin.Topology.ContinuousFunction.Basic
+import Algebra.Star.Pi
+import Algebra.Star.Prod
+import Topology.Algebra.Constructions
+import Topology.ContinuousFunction.Basic
 
 #align_import topology.algebra.star from "leanprover-community/mathlib"@"50832daea47b195a48b5b33b1c8b2162c48c3afc"

50832dae

bump to nightly-2023-09-02-06

mathlib commit https://github.com/leanprover-community/mathlib/commit/442a83d738cb208d3600056c489be16900ba701d

a4ca67cb

Diff

@@ -124,7 +124,7 @@ instance {C : ι → Type _} [∀ i, TopologicalSpace (C i)] [∀ i, Star (C i)]
 instance [Star R] [TopologicalSpace R] [ContinuousStar R] : ContinuousStar Rᵐᵒᵖ :=
   ⟨MulOpposite.continuous_op.comp <| MulOpposite.continuous_unop.unit⟩
 
-instance [Monoid R] [StarSemigroup R] [TopologicalSpace R] [ContinuousStar R] : ContinuousStar Rˣ :=
+instance [Monoid R] [StarMul R] [TopologicalSpace R] [ContinuousStar R] : ContinuousStar Rˣ :=
   ⟨continuous_induced_rng.2 Units.continuous_embedProduct.unit⟩
 
 end Instances

50832dae

bump to nightly-2023-07-20-09

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

9c56d0dd

Diff

@@ -2,17 +2,14 @@
 Copyright (c) 2022 Eric Wieser. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Eric Wieser
-
-! This file was ported from Lean 3 source module topology.algebra.star
-! leanprover-community/mathlib commit 50832daea47b195a48b5b33b1c8b2162c48c3afc
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.Algebra.Star.Pi
 import Mathbin.Algebra.Star.Prod
 import Mathbin.Topology.Algebra.Constructions
 import Mathbin.Topology.ContinuousFunction.Basic
 
+#align_import topology.algebra.star from "leanprover-community/mathlib"@"50832daea47b195a48b5b33b1c8b2162c48c3afc"
+
 /-!
 # Continuity of `star`

50832dae

bump to nightly-2023-06-13-21

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

829520ac

Diff

@@ -69,30 +69,40 @@ theorem tendsto_star (a : R) : Tendsto star (𝓝 a) (𝓝 (star a)) :=
 #align tendsto_star tendsto_star
 -/
 
+#print Filter.Tendsto.star /-
 theorem Filter.Tendsto.star {f : α → R} {l : Filter α} {y : R} (h : Tendsto f l (𝓝 y)) :
     Tendsto (fun x => star (f x)) l (𝓝 (star y)) :=
   (continuous_star.Tendsto y).comp h
 #align filter.tendsto.star Filter.Tendsto.star
+-/
 
 variable [TopologicalSpace α] {f : α → R} {s : Set α} {x : α}
 
+#print Continuous.star /-
 @[continuity]
 theorem Continuous.star (hf : Continuous f) : Continuous fun x => star (f x) :=
   continuous_star.comp hf
 #align continuous.star Continuous.star
+-/
 
+#print ContinuousAt.star /-
 theorem ContinuousAt.star (hf : ContinuousAt f x) : ContinuousAt (fun x => star (f x)) x :=
   continuousAt_star.comp hf
 #align continuous_at.star ContinuousAt.star
+-/
 
+#print ContinuousOn.star /-
 theorem ContinuousOn.star (hf : ContinuousOn f s) : ContinuousOn (fun x => star (f x)) s :=
   continuous_star.comp_continuousOn hf
 #align continuous_on.star ContinuousOn.star
+-/
 
+#print ContinuousWithinAt.star /-
 theorem ContinuousWithinAt.star (hf : ContinuousWithinAt f s x) :
     ContinuousWithinAt (fun x => star (f x)) s x :=
   hf.unit
 #align continuous_within_at.star ContinuousWithinAt.star
+-/
 
 #print starContinuousMap /-
 /-- The star operation bundled as a continuous map. -/

50832dae

bump to nightly-2023-05-28-18

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

8d353152

Diff

@@ -24,7 +24,7 @@ This file defines the `has_continuous_star` typeclass, along with instances on `
 -/
 
 
-open Filter Topology
+open scoped Filter Topology
 
 open Filter

50832dae

bump to nightly-2023-05-28-06

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

ba5d8b97

Diff

@@ -69,12 +69,6 @@ theorem tendsto_star (a : R) : Tendsto star (𝓝 a) (𝓝 (star a)) :=
 #align tendsto_star tendsto_star
 -/
 
-/- warning: filter.tendsto.star -> Filter.Tendsto.star is a dubious translation:
-lean 3 declaration is
-  forall {α : Type.{u1}} {R : Type.{u2}} [_inst_1 : TopologicalSpace.{u2} R] [_inst_2 : Star.{u2} R] [_inst_3 : ContinuousStar.{u2} R _inst_1 _inst_2] {f : α -> R} {l : Filter.{u1} α} {y : R}, (Filter.Tendsto.{u1, u2} α R f l (nhds.{u2} R _inst_1 y)) -> (Filter.Tendsto.{u1, u2} α R (fun (x : α) => Star.star.{u2} R _inst_2 (f x)) l (nhds.{u2} R _inst_1 (Star.star.{u2} R _inst_2 y)))
-but is expected to have type
-  forall {α : Type.{u1}} [R : TopologicalSpace.{u1} α] [_inst_1 : Star.{u1} α] [_inst_2 : ContinuousStar.{u1} α R _inst_1] {_inst_3 : Type.{u2}} {f : _inst_3 -> α} {l : Filter.{u2} _inst_3} {y : α}, (Filter.Tendsto.{u2, u1} _inst_3 α f l (nhds.{u1} α R y)) -> (Filter.Tendsto.{u2, u1} _inst_3 α (fun (x : _inst_3) => Star.star.{u1} α _inst_1 (f x)) l (nhds.{u1} α R (Star.star.{u1} α _inst_1 y)))
-Case conversion may be inaccurate. Consider using '#align filter.tendsto.star Filter.Tendsto.starₓ'. -/
 theorem Filter.Tendsto.star {f : α → R} {l : Filter α} {y : R} (h : Tendsto f l (𝓝 y)) :
     Tendsto (fun x => star (f x)) l (𝓝 (star y)) :=
   (continuous_star.Tendsto y).comp h
@@ -82,43 +76,19 @@ theorem Filter.Tendsto.star {f : α → R} {l : Filter α} {y : R} (h : Tendsto
 
 variable [TopologicalSpace α] {f : α → R} {s : Set α} {x : α}
 
-/- warning: continuous.star -> Continuous.star is a dubious translation:
-lean 3 declaration is
-  forall {α : Type.{u1}} {R : Type.{u2}} [_inst_1 : TopologicalSpace.{u2} R] [_inst_2 : Star.{u2} R] [_inst_3 : ContinuousStar.{u2} R _inst_1 _inst_2] [_inst_4 : TopologicalSpace.{u1} α] {f : α -> R}, (Continuous.{u1, u2} α R _inst_4 _inst_1 f) -> (Continuous.{u1, u2} α R _inst_4 _inst_1 (fun (x : α) => Star.star.{u2} R _inst_2 (f x)))
-but is expected to have type
-  forall {α : Type.{u1}} {R : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} α] [_inst_2 : Star.{u1} α] [_inst_3 : ContinuousStar.{u1} α _inst_1 _inst_2] [_inst_4 : TopologicalSpace.{u2} R] {f : R -> α}, (Continuous.{u2, u1} R α _inst_4 _inst_1 f) -> (Continuous.{u2, u1} R α _inst_4 _inst_1 (fun (x : R) => Star.star.{u1} α _inst_2 (f x)))
-Case conversion may be inaccurate. Consider using '#align continuous.star Continuous.starₓ'. -/
 @[continuity]
 theorem Continuous.star (hf : Continuous f) : Continuous fun x => star (f x) :=
   continuous_star.comp hf
 #align continuous.star Continuous.star
 
-/- warning: continuous_at.star -> ContinuousAt.star is a dubious translation:
-lean 3 declaration is
-  forall {α : Type.{u1}} {R : Type.{u2}} [_inst_1 : TopologicalSpace.{u2} R] [_inst_2 : Star.{u2} R] [_inst_3 : ContinuousStar.{u2} R _inst_1 _inst_2] [_inst_4 : TopologicalSpace.{u1} α] {f : α -> R} {x : α}, (ContinuousAt.{u1, u2} α R _inst_4 _inst_1 f x) -> (ContinuousAt.{u1, u2} α R _inst_4 _inst_1 (fun (x : α) => Star.star.{u2} R _inst_2 (f x)) x)
-but is expected to have type
-  forall {α : Type.{u1}} {R : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} α] [_inst_2 : Star.{u1} α] [_inst_3 : ContinuousStar.{u1} α _inst_1 _inst_2] [_inst_4 : TopologicalSpace.{u2} R] {f : R -> α} {x : R}, (ContinuousAt.{u2, u1} R α _inst_4 _inst_1 f x) -> (ContinuousAt.{u2, u1} R α _inst_4 _inst_1 (fun (x : R) => Star.star.{u1} α _inst_2 (f x)) x)
-Case conversion may be inaccurate. Consider using '#align continuous_at.star ContinuousAt.starₓ'. -/
 theorem ContinuousAt.star (hf : ContinuousAt f x) : ContinuousAt (fun x => star (f x)) x :=
   continuousAt_star.comp hf
 #align continuous_at.star ContinuousAt.star
 
-/- warning: continuous_on.star -> ContinuousOn.star is a dubious translation:
-lean 3 declaration is
-  forall {α : Type.{u1}} {R : Type.{u2}} [_inst_1 : TopologicalSpace.{u2} R] [_inst_2 : Star.{u2} R] [_inst_3 : ContinuousStar.{u2} R _inst_1 _inst_2] [_inst_4 : TopologicalSpace.{u1} α] {f : α -> R} {s : Set.{u1} α}, (ContinuousOn.{u1, u2} α R _inst_4 _inst_1 f s) -> (ContinuousOn.{u1, u2} α R _inst_4 _inst_1 (fun (x : α) => Star.star.{u2} R _inst_2 (f x)) s)
-but is expected to have type
-  forall {α : Type.{u1}} {R : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} α] [_inst_2 : Star.{u1} α] [_inst_3 : ContinuousStar.{u1} α _inst_1 _inst_2] [_inst_4 : TopologicalSpace.{u2} R] {f : R -> α} {s : Set.{u2} R}, (ContinuousOn.{u2, u1} R α _inst_4 _inst_1 f s) -> (ContinuousOn.{u2, u1} R α _inst_4 _inst_1 (fun (x : R) => Star.star.{u1} α _inst_2 (f x)) s)
-Case conversion may be inaccurate. Consider using '#align continuous_on.star ContinuousOn.starₓ'. -/
 theorem ContinuousOn.star (hf : ContinuousOn f s) : ContinuousOn (fun x => star (f x)) s :=
   continuous_star.comp_continuousOn hf
 #align continuous_on.star ContinuousOn.star
 
-/- warning: continuous_within_at.star -> ContinuousWithinAt.star is a dubious translation:
-lean 3 declaration is
-  forall {α : Type.{u1}} {R : Type.{u2}} [_inst_1 : TopologicalSpace.{u2} R] [_inst_2 : Star.{u2} R] [_inst_3 : ContinuousStar.{u2} R _inst_1 _inst_2] [_inst_4 : TopologicalSpace.{u1} α] {f : α -> R} {s : Set.{u1} α} {x : α}, (ContinuousWithinAt.{u1, u2} α R _inst_4 _inst_1 f s x) -> (ContinuousWithinAt.{u1, u2} α R _inst_4 _inst_1 (fun (x : α) => Star.star.{u2} R _inst_2 (f x)) s x)
-but is expected to have type
-  forall {α : Type.{u1}} {R : Type.{u2}} [_inst_1 : TopologicalSpace.{u1} α] [_inst_2 : Star.{u1} α] [_inst_3 : ContinuousStar.{u1} α _inst_1 _inst_2] [_inst_4 : TopologicalSpace.{u2} R] {f : R -> α} {s : Set.{u2} R} {x : R}, (ContinuousWithinAt.{u2, u1} R α _inst_4 _inst_1 f s x) -> (ContinuousWithinAt.{u2, u1} R α _inst_4 _inst_1 (fun (x : R) => Star.star.{u1} α _inst_2 (f x)) s x)
-Case conversion may be inaccurate. Consider using '#align continuous_within_at.star ContinuousWithinAt.starₓ'. -/
 theorem ContinuousWithinAt.star (hf : ContinuousWithinAt f s x) :
     ContinuousWithinAt (fun x => star (f x)) s x :=
   hf.unit

50832dae

bump to nightly-2023-02-21-16

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

1107b979

Changes in mathlib4

mathlib3

mathlib4

4c19a16e

chore: redistribute tags for fun_prop regarding continuity across the library (#10494)

Co-authored-by: Yury G. Kudryashov <urkud@urkud.name>

98a6b538

Diff

@@ -54,15 +54,17 @@ theorem Filter.Tendsto.star {f : α → R} {l : Filter α} {y : R} (h : Tendsto
 
 variable [TopologicalSpace α] {f : α → R} {s : Set α} {x : α}
 
-@[continuity]
+@[continuity, fun_prop]
 theorem Continuous.star (hf : Continuous f) : Continuous fun x => star (f x) :=
   continuous_star.comp hf
 #align continuous.star Continuous.star
 
+@[fun_prop]
 theorem ContinuousAt.star (hf : ContinuousAt f x) : ContinuousAt (fun x => star (f x)) x :=
   continuousAt_star.comp hf
 #align continuous_at.star ContinuousAt.star
 
+@[fun_prop]
 theorem ContinuousOn.star (hf : ContinuousOn f s) : ContinuousOn (fun x => star (f x)) s :=
   continuous_star.comp_continuousOn hf
 #align continuous_on.star ContinuousOn.star

4c19a16e

chore(Topology): remove autoImplicit from most remaining files (#9865)

d1054e16

Diff

@@ -17,8 +17,6 @@ This file defines the `ContinuousStar` typeclass, along with instances on `Pi`,
 `MulOpposite`, and `Units`.
 -/
 
-set_option autoImplicit true
-
 open Filter Topology
 
 /-- Basic hypothesis to talk about a topological space with a continuous `star` operator. -/
@@ -31,7 +29,7 @@ export ContinuousStar (continuous_star)
 
 section Continuity
 
-variable [TopologicalSpace R] [Star R] [ContinuousStar R]
+variable {α R : Type*} [TopologicalSpace R] [Star R] [ContinuousStar R]
 
 theorem continuousOn_star {s : Set R} : ContinuousOn star s :=
   continuous_star.continuousOn
@@ -84,6 +82,8 @@ end Continuity
 
 section Instances
 
+variable {R S ι : Type*}
+
 instance [Star R] [Star S] [TopologicalSpace R] [TopologicalSpace S] [ContinuousStar R]
     [ContinuousStar S] : ContinuousStar (R × S) :=
   ⟨(continuous_star.comp continuous_fst).prod_mk (continuous_star.comp continuous_snd)⟩

4c19a16e

style: fix wrapping of where (#7149)

084cfb35

Diff

@@ -89,8 +89,8 @@ instance [Star R] [Star S] [TopologicalSpace R] [TopologicalSpace S] [Continuous
   ⟨(continuous_star.comp continuous_fst).prod_mk (continuous_star.comp continuous_snd)⟩
 
 instance {C : ι → Type*} [∀ i, TopologicalSpace (C i)] [∀ i, Star (C i)]
-    [∀ i, ContinuousStar (C i)] : ContinuousStar (∀ i, C i)
-    where continuous_star := continuous_pi fun i => Continuous.star (continuous_apply i)
+    [∀ i, ContinuousStar (C i)] : ContinuousStar (∀ i, C i) where
+  continuous_star := continuous_pi fun i => Continuous.star (continuous_apply i)
 
 instance [Star R] [TopologicalSpace R] [ContinuousStar R] : ContinuousStar Rᵐᵒᵖ :=
   ⟨MulOpposite.continuous_op.comp <| MulOpposite.continuous_unop.star⟩

4c19a16e

refactor(Algebra/Star/*): Allow for star operation on non-associative algebras (#6562)

Typically a * operation on a mathematical structure R equipped with a multiplication is an involutive anti-automorphism i.e.

∀ r s : R, star (r * s) = star s * star r

Currently mathlib defines a class StarSemigroup to be a semigroup satisfying this property. However, the requirement for the multiplication to be associative is unnecessarily restrictive. There are important classes of star-algebra which are not associative (e.g. JB*-algebras).

This PR removes the requirement for a StarSemigroup to be a semigroup, merely requiring it to have a multiplication.

I've changed the name from StarSemigroup to StarMul since it's no longer a semigroup.

Zulip discussion

Previously opened as a mathlib PR https://github.com/leanprover-community/mathlib/pull/17949

Co-authored-by: Christopher Hoskin <mans0954@users.noreply.github.com> Co-authored-by: Eric Wieser <wieser.eric@gmail.com>

85c04e73

Diff

@@ -95,7 +95,7 @@ instance {C : ι → Type*} [∀ i, TopologicalSpace (C i)] [∀ i, Star (C i)]
 instance [Star R] [TopologicalSpace R] [ContinuousStar R] : ContinuousStar Rᵐᵒᵖ :=
   ⟨MulOpposite.continuous_op.comp <| MulOpposite.continuous_unop.star⟩
 
-instance [Monoid R] [StarSemigroup R] [TopologicalSpace R] [ContinuousStar R] :
+instance [Monoid R] [StarMul R] [TopologicalSpace R] [ContinuousStar R] :
     ContinuousStar Rˣ :=
   ⟨continuous_induced_rng.2 Units.continuous_embedProduct.star⟩

4c19a16e

fix: disable autoImplicit globally (#6528)

Autoimplicits are highly controversial and also defeat the performance-improving work in #6474.

The intent of this PR is to make autoImplicit opt-in on a per-file basis, by disabling it in the lakefile and enabling it again with set_option autoImplicit true in the few files that rely on it.

That also keeps this PR small, as opposed to attempting to "fix" files to not need it any more.

I claim that many of the uses of autoImplicit in these files are accidental; situations such as:

Assuming variables are in scope, but pasting the lemma in the wrong section
Pasting in a lemma from a scratch file without checking to see if the variable names are consistent with the rest of the file
Making a copy-paste error between lemmas and forgetting to add an explicit arguments.

Having set_option autoImplicit false as the default prevents these types of mistake being made in the 90% of files where autoImplicits are not used at all, and causes them to be caught by CI during review.

I think there were various points during the port where we encouraged porters to delete the universes u v lines; I think having autoparams for universe variables only would cover a lot of the cases we actually use them, while avoiding any real shortcomings.

A Zulip poll (after combining overlapping votes accordingly) was in favor of this change with 5:5:18 as the no:dontcare:yes vote ratio.

While this PR was being reviewed, a handful of files gained some more likely-accidental autoImplicits. In these places, set_option autoImplicit true has been placed locally within a section, rather than at the top of the file.

0c24f831

Diff

@@ -17,6 +17,8 @@ This file defines the `ContinuousStar` typeclass, along with instances on `Pi`,
 `MulOpposite`, and `Units`.
 -/
 
+set_option autoImplicit true
+
 open Filter Topology
 
 /-- Basic hypothesis to talk about a topological space with a continuous `star` operator. -/

4c19a16e

chore: banish Type _ and Sort _ (#6499)

We remove all possible occurences of Type _ and Sort _ in favor of Type* and Sort*.

This has nice performance benefits.

32de3f67

Diff

@@ -20,7 +20,7 @@ This file defines the `ContinuousStar` typeclass, along with instances on `Pi`,
 open Filter Topology
 
 /-- Basic hypothesis to talk about a topological space with a continuous `star` operator. -/
-class ContinuousStar (R : Type _) [TopologicalSpace R] [Star R] : Prop where
+class ContinuousStar (R : Type*) [TopologicalSpace R] [Star R] : Prop where
   /-- The `star` operator is continuous. -/
   continuous_star : Continuous (star : R → R)
 #align has_continuous_star ContinuousStar
@@ -86,7 +86,7 @@ instance [Star R] [Star S] [TopologicalSpace R] [TopologicalSpace S] [Continuous
     [ContinuousStar S] : ContinuousStar (R × S) :=
   ⟨(continuous_star.comp continuous_fst).prod_mk (continuous_star.comp continuous_snd)⟩
 
-instance {C : ι → Type _} [∀ i, TopologicalSpace (C i)] [∀ i, Star (C i)]
+instance {C : ι → Type*} [∀ i, TopologicalSpace (C i)] [∀ i, Star (C i)]
     [∀ i, ContinuousStar (C i)] : ContinuousStar (∀ i, C i)
     where continuous_star := continuous_pi fun i => Continuous.star (continuous_apply i)

4c19a16e

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

@@ -2,17 +2,14 @@
 Copyright (c) 2022 Eric Wieser. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Eric Wieser
-
-! This file was ported from Lean 3 source module topology.algebra.star
-! leanprover-community/mathlib commit 4c19a16e4b705bf135cf9a80ac18fcc99c438514
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.Algebra.Star.Pi
 import Mathlib.Algebra.Star.Prod
 import Mathlib.Topology.Algebra.Constructions
 import Mathlib.Topology.ContinuousFunction.Basic
 
+#align_import topology.algebra.star from "leanprover-community/mathlib"@"4c19a16e4b705bf135cf9a80ac18fcc99c438514"
+
 /-!
 # Continuity of `star`

4c19a16e

feat: port continuity tactic (#2145)

We implement the continuity tactic using aesop, this makes it more robust and reduces the code to trivial macros.

4f818d25

Diff

@@ -57,7 +57,7 @@ theorem Filter.Tendsto.star {f : α → R} {l : Filter α} {y : R} (h : Tendsto
 
 variable [TopologicalSpace α] {f : α → R} {s : Set α} {x : α}
 
--- @[continuity] Porting note: restore attribute
+@[continuity]
 theorem Continuous.star (hf : Continuous f) : Continuous fun x => star (f x) :=
   continuous_star.comp hf
 #align continuous.star Continuous.star

4c19a16e

feat: port Topology.Algebra.Star (#2094)

Co-authored-by: Ruben Van de Velde <65514131+Ruben-VandeVelde@users.noreply.github.com> Co-authored-by: Kevin Buzzard <k.buzzard@imperial.ac.uk>

d75bf7bb

`topology.algebra.star` ⟷ `Mathlib.Topology.Algebra.Star`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 8 + 344

topology.algebra.star ⟷ Mathlib.Topology.Algebra.Star

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 8 + 344

`topology.algebra.star` ⟷ `Mathlib.Topology.Algebra.Star`