proposition: Lemma ler_wpM2r x : 0 <= x -> {homo *%R^~ x : y z / y <= z}.
proof: Proof. by move=> x_ge0 y z leyz; rewrite ![_ * x]mulrC ler_wpM2l. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)