proposition: Lemma intEsg m : m = (sgz m * `|m|%:Z)%R.
proof: Proof. by rewrite -sgrz -numEsg. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)