proposition: Lemma mulz_divCA_gcd n m : n * (m %/ gcdz n m)%Z = m * (n %/ gcdz n m)%Z.
proof: Proof. by rewrite mulz_divCA ?dvdz_gcdl ?dvdz_gcdr. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq path) mathcomp(div choice fintype tuple finfun bigop prime order) mathcomp(ssralg poly ssrnum ssrint archimedean rat matrix) mathcomp(polydiv perm zmodp mxalgebra vector)