reserve n,m,k for Nat,
  x,X for set,
  A for Subset of X,
  A1,A2 for SetSequence of X;

theorem Th85:
  A \+\ lim_sup A1 c= lim_sup (A (\+\) A1)
proof
  (A (\+\) A1).n = A \+\ A1.n by Def9;
  hence thesis by KURATO_0:17;
end;
