Commit 2021-02-13 07:17 43bfd903

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_homs 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.