proposition: Lemma succn_snum_subproof n : Signed.spec 0 !=0 >=0 n.+1.
proof: Proof. by []. Qed.
imports: HB(structures) Coq(ssreflect ssrfun ssrbool) mathcomp(ssrnat eqtype choice order ssralg ssrnum ssrint) mathcomp(mathcomp_extra)