proposition: Lemma realrMn x n : (n != 0)%N -> (x *+ n \is real) = (x \is real).
proof: Proof. by move=> n_neq0; rewrite -mulr_natl realMr ?realn ?pnatr_eq0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)