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Theorem subsemigroup.mul_mem

Modification history

2022-04-21 20:30
src/group_theory/subsemigroup/basic.lean
refactor(group_theory/{submonoid, subsemigroup}/basic): move `mul_mem_class` (#13559) …
Deleted subsemigroup.mul_memView on Github →
2022-03-16 10:05
src/group_theory/subsemigroup/basic.lean
feat(group_theory/subsemigroup/basic): subsemigroups (#12111) …
Added subsemigroup.mul_memView on Github →