proposition: Lemma Stern_bij_lt1K x : 0 < x -> Stern_bij (Sba_i x) = (Stern_bij x).*2.
proof: Proof. by move /Sba_i_pos /Stern_bij_lt1; rewrite Sba_iK. 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)