proposition: Lemma sigma_algebra_measurable : sigma_algebra setT (@measurable d T).
proof: Proof. by split=> // [A|]; [exact: measurableD|exact: bigcupT_measurable]. 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)