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[Merged by Bors] - refactor: Remove leftCoset/rightCoset #8877

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@YaelDillies YaelDillies commented Dec 7, 2023

Those two definitions are completely obsolete now that we have the pointwise API. This PR removes them but not the corresponding API. A much more tedious subsequent PR will be needed to merge the two API.

Note that I need to tweak simp lemmas to keep confluence since I'm merging two pairs of head keys together.


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Those two definitions are completely obsolete now that we have the pointwise API. This PR removes them but not the corresponding API. A much more tedious subsequent PR will be needed to merge the two API.
@YaelDillies YaelDillies added awaiting-review The author would like community review of the PR awaiting-CI t-algebra Algebra (groups, rings, fields etc) labels Dec 7, 2023
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@eric-wieser eric-wieser left a comment

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This looks great, but it's probably worth a second opinion.

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Let's ask @semorrison since they authored this file... five years ago? 🧓

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I am in favour of merging this PR. But I think we should also make serious work of implementing notation for right actions that keeps the action visibly on the right. The version using op will eventually lead to extremely confusing expressions, I'm quite sure.

Mathlib/GroupTheory/Coset.lean Outdated Show resolved Hide resolved
Co-authored-by: Eric Wieser <wieser.eric@gmail.com>
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I agree although this is mostly orthogonal to this PR since the op a • s notation is already vastly used and the rightCoset a s notation is very much not.

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Thanks 🎉

bors merge

@github-actions github-actions bot added ready-to-merge This PR has been sent to bors. and removed awaiting-review The author would like community review of the PR labels Dec 9, 2023
mathlib-bors bot pushed a commit that referenced this pull request Dec 9, 2023
Those two definitions are completely obsolete now that we have the pointwise API. This PR removes them but not the corresponding API. A much more tedious subsequent PR will be needed to merge the two API.

Note that I need to tweak simp lemmas to keep confluence since I'm merging two pairs of head keys together.
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mathlib-bors bot commented Dec 9, 2023

Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors bot changed the title refactor: Remove leftCoset/rightCoset [Merged by Bors] - refactor: Remove leftCoset/rightCoset Dec 9, 2023
@mathlib-bors mathlib-bors bot closed this Dec 9, 2023
@mathlib-bors mathlib-bors bot deleted the kill_coset branch December 9, 2023 10:10
awueth pushed a commit that referenced this pull request Dec 19, 2023
Those two definitions are completely obsolete now that we have the pointwise API. This PR removes them but not the corresponding API. A much more tedious subsequent PR will be needed to merge the two API.

Note that I need to tweak simp lemmas to keep confluence since I'm merging two pairs of head keys together.
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