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Commit 2021-04-22 20:22 b401f074

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feat(src/group_theory/subgroup): add closure.submonoid.closure (#7328) subgroup.closure S equals submonoid.closure (S ∪ S⁻¹).

Estimated changes

Modified src/group_theory/subgroup.lean

added theorem subgroup.closure_induction''

added theorem subgroup.closure_inv

added theorem subgroup.closure_to_submonoid

added theorem subgroup.inv_subset_closure

added theorem subgroup.mem_to_submonoid

Modified src/group_theory/submonoid/membership.lean

added theorem submonoid.mem_closure_inv