proposition: Lemma modzDml m n d : ((m %% d)%Z + n = m + n %[mod d])%Z.
proof: Proof. by rewrite {2}(divz_eq m d) -[_ * d + _ + n]addrA modzMDl. 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)