proposition: Lemma divzz d : (d %/ d)%Z = (d != 0).
proof: Proof. by have [-> // | d_nz] := eqVneq; rewrite -{1}[d]mul1r mulzK. 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)