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Commit 2022-03-14 12:19 09ea7fb0

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feat(data/finset/noncomm_prod): finite pi lemmas (#12291) including a few helpers

Estimated changes

Modified src/algebra/group/pi.lean

added theorem pi.mul_single_apply_commute

added theorem pi.mul_single_commute

Modified src/data/finset/noncomm_prod.lean

added theorem finset.noncomm_prod_eq_pow_card

added theorem finset.noncomm_prod_map

added theorem finset.noncomm_prod_mul_single

added theorem monoid_hom.pi_ext

added theorem multiset.nocomm_prod_map_aux

added theorem multiset.noncomm_prod_eq_pow_card

added theorem multiset.noncomm_prod_map