proposition: Lemma mU : setU_closed measurable.
proof: Proof. move=> A B mA mB; rewrite -bigcup2E. by apply: measurable_bigcup => -[//|[//|i]]; exact: measurable0. 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)