[Merged by Bors] - feat(group_theory/subgroup/basic): weaken some TC assumptions #17698
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Co-authored-by: Anne Baanen <Vierkantor@users.noreply.github.com>
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* Add `to_additive` to `units.coe_to_hom_units`. * Assume that the codomain is a `mul_one_class` instead of a `group` in `monoid_hom.eq_iff`, `monoid_hom.ker_one`, `monoid_hom.ker_eq_bot_iff`, and `monoid_hom.normal_ker`. * Add `monoid_hom.ker_cod_restrict`, rename `monoid_hom.range_restrict_ker` to `monoid_hom.ker_range_restrict`. * Golf some proofs.
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* Add `to_additive` to `units.coe_to_hom_units`. * Assume that the codomain is a `mul_one_class` instead of a `group` in `monoid_hom.eq_iff`, `monoid_hom.ker_one`, `monoid_hom.ker_eq_bot_iff`, and `monoid_hom.normal_ker`. * Add `monoid_hom.ker_cod_restrict`, rename `monoid_hom.range_restrict_ker` to `monoid_hom.ker_range_restrict`. * Golf some proofs.
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to_additivetounits.coe_to_hom_units.mul_one_classinstead of agroupinmonoid_hom.eq_iff,monoid_hom.ker_one,monoid_hom.ker_eq_bot_iff, andmonoid_hom.normal_ker.monoid_hom.ker_cod_restrict, renamemonoid_hom.range_restrict_kertomonoid_hom.ker_range_restrict.