proposition: Lemma sigma_algebraC (A : set T) : <<s G >> A -> <<s G >> (~` A).
proof: Proof. by move=> sGA; rewrite -setTD; exact: sigma_algebraCD. 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)