proposition: Lemma negligibleS A B : B `<=` A -> mu.-negligible A -> mu.-negligible B.
proof: Proof. by move=> BA [N [mN N0 AN]]; exists N; split => //; exact: subset_trans AN. Qed.
imports: mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality fsbigop ) reals ereal signed topology normedtype sequences esum numfun HB(structures)