proposition: Lemma real_complex_is_multiplicative : multiplicative (real_complex R).
proof: Proof. by split=> // a b /=; simpc; rewrite !mulr0 !mul0r addr0 subr0. Qed.
imports: HB(structures) mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice fintype) mathcomp(bigop order ssralg ssrint div ssrnum rat poly closed_field) mathcomp(polyrcf matrix mxalgebra tuple mxpoly zmodp binomial realalg) mathcomp(mxpoly)