proposition: Lemma divz_nat (n d : nat) : (n %/ d)%Z = n %/ d.
proof: Proof. by case: d => // d; rewrite /divz /= mul1r. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq choice fintype order bigop ssralg) mathcomp(div ssrnum ssrint rat prime path binomial) mathcomp(tuple finset) gaia(fibm)