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feat(linear_algebra/invariant_submodule): invariant submodules #18289

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defining and proving some lemmas on invariant submodules


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Thanks!
maintainer merge

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🚀 Pull request has been placed on the maintainer queue by alreadydone.

@eric-wieser eric-wieser self-requested a review January 26, 2023 21:45
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@themathqueen themathqueen removed the awaiting-review The author would like community review of the PR label Feb 3, 2023
@eric-wieser eric-wieser removed the undergrad Relates to undergrad.yaml label Feb 8, 2023
@eric-wieser eric-wieser added the awaiting-review The author would like community review of the PR label Feb 8, 2023
@semorrison semorrison added the modifies-synchronized-file This PR touches a files that has already been ported to mathlib4, and may need a synchronization PR. label Mar 28, 2023
@eric-wieser eric-wieser added the not-too-late This PR was ready at the point mathlib3 was frozen: we will try to merge it and port it to mathlib4 label Jul 15, 2023
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I've created a zulip thread about this PR.

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awaiting-review The author would like community review of the PR modifies-synchronized-file This PR touches a files that has already been ported to mathlib4, and may need a synchronization PR. not-too-late This PR was ready at the point mathlib3 was frozen: we will try to merge it and port it to mathlib4 t-algebra Algebra (groups, rings, fields etc)
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