proposition: Lemma Zeckv_rev l: Zeck_val (rev l) = Zeck_val l.
proof: Proof. by rewrite /Zeck_val sum_rev. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path fintype div bigop binomial) mathcomp(prime finset ssralg ssrnum ssrint)