Theorem Subgroup.index_map_dvd

Modification history

2026-09-22 12:37
Mathlib/GroupTheory/Index.lean
feat(GroupTheory/Index): add Lagrange's theorem for monoid homomorphisms (#43845)
Modified Subgroup.index_map_dvdView on Github →
2024-07-15 20:56
Mathlib/GroupTheory/Index.lean
refactor(GroupTheory/Index): Replace `Fintype.card` with `Nat.card` (#13630) …
Modified Subgroup.index_map_dvdView on Github →
2023-08-10 19:52
Mathlib/GroupTheory/Index.lean
chore: banish `Type _` and `Sort _` (#6499) …
Modified Subgroup.index_map_dvdView on Github →
2023-02-14 07:17
Mathlib/GroupTheory/Index.lean
feat: port GroupTheory.Index (#2222)
Added Subgroup.index_map_dvdView on Github →