proposition: Lemma FM_dE n: FMd (n.+1) = (FMc n) + (FMd n).
proof: Proof. by rewrite /= (surjective_pairing (Fib_fusc_rec n)). 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)