proposition: Lemma mulr_gcdr a b c : a * gcdr b c %= gcdr (a * b) (a * c).
proof: Proof. by rewrite eqd_sym gcdr_mul2l. Qed.
imports: HB(structures) Coq(ssreflect ssrfun ssrbool Arith.Wf_nat) mathcomp(eqtype ssrnat div seq path) mathcomp(ssralg fintype perm tuple choice generic_quotient) mathcomp(matrix bigop zmodp mxalgebra poly) stronglydiscrete