proposition: Fact sgp x : sgr p.[x] = sp'c * sgr q.[x].
proof: Proof. by rewrite hornerZ sgr_smul mulrA -expr2 sqr_sg derp_neq0 ?mul1r. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice fintype) mathcomp(bigop order ssralg poly polydiv ssrnum zmodp) mathcomp(polyorder path interval ssrint)