Theorem Subsemigroup.map_comap_eq_self

Modification history

2024-07-31 06:44
Mathlib/Algebra/Group/Subsemigroup/Operations.lean
feat: add `comap_map` for sub(semi)ring, subalgebra, subfield and intermediate fields (#15193) …
Added Subsemigroup.map_comap_eq_selfView on Github →