proposition: Lemma size_sg_tab_neq0 n : size (sg_tab n) != 0%N.
proof: Proof. by rewrite size_sg_tab exp3n. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice path fintype) mathcomp(div bigop order ssralg poly polydiv ssrnum perm zmodp ssrint) mathcomp(polyorder polyrcf interval matrix mxtens)