proposition: Lemma fusci_vald n: Fusci n 1 1 = fusc n.*2.+1.
proof: Proof. by rewrite /Fusci fusc_odd !mul1n. 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)