proposition: Lemma last_sternD u v n: last 0 (sternD u v n) = v.
proof: Proof. by elim:n => // n /= {2} <-; elim:(sternD u v n) => // c; case => // d; case. 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)