proposition: Lemma Stern_prev n: Stern_prev_fct (Stern n.+1) = Stern n.
proof: Proof. by move:(Stern_succ_fctK (Stern n)); rewrite Stern_next. 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)