proposition: Lemma fusci_0 a b: Fusci 0 a b = b.
proof: Proof. by rewrite /Fusci muln0 muln1 //. 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)