proposition: Lemma irreflexive_llen: irreflexive llen.
proof: Proof. by move => x /=; rewrite ltnNge leqnSn. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path fintype div bigop binomial) mathcomp(prime finset ssralg ssrnum ssrint)