Theorem Subgroup.relindex_comap_ne_zero

Modification history

2025-09-13 17:16
Mathlib/GroupTheory/Index.lean
chore(GroupTheory/Index): rename `relindex` to `relIndex` (#19872) …
Deleted Subgroup.relindex_comap_ne_zeroView on Github →
2025-05-24 20:33
Mathlib/GroupTheory/Index.lean
feat(NumberTheory/ModularForms): Conjugation by GL(2, Q) preserves congruence subgroups (#24740) …
Added Subgroup.relindex_comap_ne_zeroView on Github →