fact: Definition group_algebra {G: gr} := make_algebra_simple_single_sorted' group_signature G [( op ; unel G; grinv G )].
imports: UniMath.MoreFoundations.Notations UniMath.Combinatorics.StandardFiniteSets UniMath.Combinatorics.MoreLists UniMath.Algebra.Groups UniMath.Algebra.Universal.EqAlgebras