proposition: Fact subfx_scaler1r : left_id 1 subfx_scale.
proof: Proof. by move=> x; rewrite /subfx_scale rmorph1 mul1r. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq div) mathcomp(choice fintype tuple finfun bigop ssralg countalg) mathcomp(finalg zmodp matrix vector falgebra poly polydiv) mathcomp(mxpoly generic_quotient)