 reserve R for 1-sorted;
 reserve X,Y for Subset of R;
 reserve R for finite 1-sorted;
 reserve X,Y for Subset of R;
 reserve R for finite Approximation_Space;
 reserve X,Y,Z,W for Subset of R;

theorem :: Proposition 2 f)
  Z misses Y & Z c= W implies
    kappa (Y \ Z, W) <= kappa (Y, W) <= kappa (Y \/ Z,W) by Test1AAA,Test2AAA;
