proposition: Lemma divzN m d : (m %/ - d)%Z = - (m %/ d)%Z.
proof: Proof. by case: m => n; rewrite /divz /= sgzN abszN mulNr. 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)