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feat(group_theory/marking): Group markings #18256

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Define group markings, marked groups and show that a marked group is a normed group with the norm induced by its marking.


More material on branch geometric-group-theory

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@YaelDillies YaelDillies added awaiting-review The author would like community review of the PR t-algebra Algebra (groups, rings, fields etc) labels Jan 22, 2023
@sgouezel sgouezel added awaiting-author A reviewer has asked the author a question or requested changes and removed awaiting-review The author would like community review of the PR labels Jan 26, 2023
@github-actions github-actions bot added the modifies-synchronized-file This PR touches a files that has already been ported to mathlib4, and may need a synchronization PR. label Apr 20, 2023
@kim-em kim-em added the too-late This PR was ready too late for inclusion in mathlib3 label Jul 16, 2023
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Ported to LeanCamCombi

@YaelDillies YaelDillies deleted the group_marking branch November 18, 2023 11:36
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awaiting-author A reviewer has asked the author a question or requested changes modifies-synchronized-file This PR touches a files that has already been ported to mathlib4, and may need a synchronization PR. t-algebra Algebra (groups, rings, fields etc) too-late This PR was ready too late for inclusion in mathlib3
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