proposition: Lemma Tnk2_nn n: Tnk2 n n = 1.
proof: Proof. by rewrite /Tnk2 subnn bin0 mul1n addnn addn1 divnn //. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype) mathcomp(ssrnat seq path div) mathcomp(fintype tuple finfun bigop finset binomial)