proposition: Lemma bin1 n : 'C(n, 1) = n.
proof: Proof. by elim: n => //= n IHn; rewrite binS bin0 IHn addn1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(div fintype tuple finfun bigop prime finset)