proposition: Lemma lcmr_mul2l a b c : lcmr (c * a) (c * b) %= c * lcmr a b.
proof: Proof. by rewrite ![c * _]mulrC lcmr_mul2r. 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