fact: Record CRing : Type := {cr_crr : CAbGroup; cr_one : cr_crr; cr_mult : CSetoid_bin_op cr_crr; cr_proof : is_CRing cr_crr cr_one cr_mult}.
imports: CoRN.tactics.CornTac CoRN.algebra.CSums CoRN.algebra.CAbMonoids Coq.Sorting.Permutation CoRN.util.SetoidPermutation Coq.Setoids.Setoid Coq.Classes.Morphisms Coq(Lia)