proposition: Lemma caratheodory_measurable_setC A : M A -> M (~` A).
proof: Proof. by move=> MA X; rewrite setCK addeC -MA. 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)