reserve n,k for Nat,
  X for non empty set,
  S for SigmaField of X;

theorem
  for M be sigma_Measure of S, F be SetSequence of S st F is convergent
  & M.(Union F) < +infty holds ex G be sequence of S st
  G = superior_setsequence F & M.(lim F) = inf rng(M*G) by Th4;
