reserve Y for non empty set,
  a for Function of Y,BOOLEAN,
  G for Subset of PARTITIONS(Y),
  P,Q for a_partition of Y;

theorem Th14:
  G is independent implies for P,Q being Subset of PARTITIONS Y st
  P c= G & Q c= G holds ERl('/\'P)*ERl('/\'Q) = ERl('/\'Q)*ERl('/\'P)
by Lm1;
