proposition: Lemma Gauss_dvdzr m n p : coprimez m n -> (m %| n * p)%Z = (m %| p)%Z.
proof: Proof. by rewrite dvdzE abszM => /Gauss_dvdr->. 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)