reserve n for Nat;

theorem Th24:
  for X,Y be non empty compact Subset of TOP-REAL 2 st E-bound X
  <= E-bound Y holds E-bound (X\/Y) = E-bound Y
proof
  let X,Y be non empty compact Subset of TOP-REAL 2;
  assume E-bound X <= E-bound Y;
  then max(E-bound X,E-bound Y) = E-bound Y by XXREAL_0:def 10;
  hence thesis by SPRECT_1:50;
end;
