proposition: Lemma fuscj_odd n m: Fuscj (n.*2.+1) m = Fuscj n (m.*2.+1).
proof: Proof. by rewrite /Fuscj fusci_odd - doubleS fusc_even fusc_odd addnC. 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)