proposition: Lemma ge0_mrat s : forall x, 0 <= mrat s x.
proof: Proof. by move=> x; rewrite mulr_ge0 ?invr_ge0 // ler0n. Qed.
imports: mathcomp(all_ssreflect all_algebra) mathcomp.classical(boolp classical_sets mathcomp_extra) xfinmap ereal reals discrete topology realseq realsum