Theorem Subgroup.relIindex_dvd_two_iff'

Modification history

2026-09-22 06:19
Mathlib/GroupTheory/Index.lean
chore: fix instance and to_additive declaration names (#44052) …
Deleted Subgroup.relIindex_dvd_two_iff'View on Github →
2025-10-22 18:34
Mathlib/GroupTheory/Index.lean
feat(GroupTheory/Index): criteria for subgroup to have index 2 (#30466) …
Added Subgroup.relIindex_dvd_two_iff'View on Github →