proposition: Lemma binSn n : 'C(n.+1, n) = n.+1.
proof: Proof. by rewrite -bin_sub ?leqnSn // subSnn bin1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(div fintype tuple finfun bigop prime finset)