fact: Definition Build_multCAbMonoid: CAbMonoid := Build_CAbMonoid Build_multCMonoid (mult_commutes R).
imports: CoRN.tactics.CornTac CoRN.algebra.CSums CoRN.algebra.CAbMonoids Coq.Sorting.Permutation CoRN.util.SetoidPermutation Coq.Setoids.Setoid Coq.Classes.Morphisms Coq(Lia)