Theorem Subgroup.index_ker

Modification history

2024-11-18 10:08
Mathlib/GroupTheory/Index.lean
refactor(GroupTheory/Index): Remove unnecessary coercions to `Set` in `index_ker` and `relindex_ker` (#19105) …
Modified Subgroup.index_kerView on Github →
2024-07-15 20:56
Mathlib/GroupTheory/Index.lean
refactor(GroupTheory/Index): Replace `Fintype.card` with `Nat.card` (#13630) …
Modified Subgroup.index_kerView on Github →
2023-02-14 07:17
Mathlib/GroupTheory/Index.lean
feat: port GroupTheory.Index (#2222)
Added Subgroup.index_kerView on Github →