Theorem mem_fixingSubgroup_iff_subset_fixedBy

Modification history

2024-02-12 10:30
Mathlib/GroupTheory/GroupAction/FixingSubgroup.lean
feat(GroupTheory/GroupAction): new `FixedPoints` module with a few basic properties of `fixedBy` (#9477) …
Added mem_fixingSubgroup_iff_subset_fixedByView on Github →