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MulAction.set_mem_fixedBy_of_subset_fixedBy
Modification history
2024-02-12 10:30
Mathlib/GroupTheory/GroupAction/FixedPoints.lean
feat(GroupTheory/GroupAction): new `FixedPoints` module with a few basic properties of `fixedBy` (#9477) …
Added
MulAction.set_mem_fixedBy_of_subset_fixedBy
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