proposition: Lemma mD : setDI_closed measurable.
proof: Proof. move=> A B mA mB; rewrite setDE -[A]setCK -setCU. by do ?[apply: measurableU | apply: measurableC]. 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)