mathlib

43bfd903 - chore(group_theory/free_group): clean up unnecessary lemmas (#6200)

chore(group_theory/free_group): clean up unnecessary lemmas (#6200) This removes: * `free_abelian_group.lift.{add,sub,neg,zero}` as these exist already as `(free_abelian_group.lift _).map_{add,sub,neg,zero}` * `free_group.to_group.{mul,one,inv}` as these exist already as `(free_group.to_group _).map_{mul,one,inv}` * `free_group.map.{mul,one,inv}` as these exist already as `(free_group.map _).map_{mul,one,inv}` * `free_group.prod.{mul,one,inv}` as these exist already as `free_group.prod.map_{mul,one,inv}` * `to_group.is_group_hom` as this is provided automatically for `monoid_hom`s and renames * `free_group.sum.{mul,one,inv}` to `free_group.sum.map_{mul,one,inv}` These lemmas are already simp lemmas thanks to the functions they relate to being bundled homs. While the new spelling is slightly longer, it makes it clear that the entire set of `monoid_hom` lemmas apply, not just the three that were copied across. This also wraps some lines to make the linter happier about these files.