[Merged by Bors] - chore: get rid of erws in Mathlib.Algebra.Group.InjSurj

[Vierkantor]

Almost all of the erws work just fine as rws. Only two places need additional rewriting: this is because the pow_succ' field of DivInvMonoids mentions Int.ofNat, which is not reducibly defeq to the actual cast we use in our lemmas.

This suggests we should redefine pow_succ' to use the actual cast instead: #17573.

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[github-actions]

PR summary 600253b2f0

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

No declarations were harmed in the making of this PR! 🐙

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

[jcommelin]

!bench

[jcommelin]

Thanks 🎉

If CI passes, please remove the label awaiting-CI and merge this yourself, by adding a comment bors r+.

bors d+

[mathlib-bors]

✌️ Vierkantor can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.

[leanprover-bot]

Here are the benchmark results for commit 600253b.
The entire run failed.
Found no significant differences.

[Vierkantor]

Not sure why the linter is failing on the benchmark machine but the GitHub actions are passing. Are you happy to merge or do we want to debug this further first?

[jcommelin]

Thanks 🎉

bors merge

[mathlib-bors]

Pull request successfully merged into master.

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