proposition: Lemma dvdz_eq d m : (d %| m)%Z = ((m %/ d)%Z * d == m).
proof: Proof. by rewrite (sameP dvdz_mod0P eqP) subr_eq0 eq_sym. 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)