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Commit 2022-03-12 04:22 1eaf4999

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feat(group_theory/subgroup/basic): {multiset_,}noncomm_prod_mem (#12523) and same for submonoids.

Estimated changes

Modified src/group_theory/subgroup/basic.lean

added theorem subgroup.multiset_noncomm_prod_mem

added theorem subgroup.noncomm_prod_mem

Modified src/group_theory/submonoid/membership.lean

added theorem submonoid.multiset_noncomm_prod_mem

added theorem submonoid.noncomm_prod_mem