proposition: Lemma ae_eq0 f g : measurable D -> mu D = 0 -> ae_eq f g.
proof: Proof. by move=> mD D0; exists D; split => // t/= /not_implyP[]. 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)