proposition: Lemma log2S_k n: (log2 n.+1) = (log2 n.+1).-1.+1.
proof: Proof. by move:(log2_eq0 n.+1); case: (log2 n.+1). 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)