proposition: Fact Z_of_nat_is_multiplicative : multiplicative Z.of_nat.
proof: Proof. by split => // m n; rewrite /GRing.mul /=; lia. Qed.
imports: Coq(ZArith) HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(div choice fintype tuple finfun bigop finset prime) mathcomp(order binomial ssralg countalg ssrnum ssrint) mathcomp(zify_ssreflect)