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Theorem subgroup.card_eq_card_quotient_mul_card_subgroup

Modification history

2021-09-08 06:17
src/group_theory/coset.lean
feat(group_theory/index): define the index of a subgroup (#8971) …
Modified subgroup.card_eq_card_quotient_mul_card_subgroupView on Github →
2021-04-06 05:50
src/group_theory/coset.lean
chore(group_theory/order_of_element): move some lemmas (#7031) …
Added subgroup.card_eq_card_quotient_mul_card_subgroupView on Github →