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Commit 2022-03-15 11:51 48ffeb79

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feat(group_theory/finiteness): quotient of fg is fg (#12652)

Estimated changes

Modified src/group_theory/coset.lean

added theorem quotient_group.mk_surjective

Modified src/group_theory/finiteness.lean

added theorem group.fg_of_surjective

Modified src/group_theory/quotient_group.lean

added theorem quotient_group.mk'_surjective

deleted theorem quotient_group.subgroup_eq_top_of_subsingleton

Modified src/group_theory/submonoid/operations.lean

added theorem monoid_hom.mrange_restrict_surjective

modified theorem submonoid.bot_or_exists_ne_one

modified theorem submonoid.bot_or_nontrivial