reserve A,O for non empty set,
  R for Order of A,
  Ol for Equivalence_Relation of O,
  f for Function of O,A*,
  g for Function of O,A;
reserve S for OverloadedRSSign;

theorem Th4:
  for S being non empty non void OverloadedMSSign holds S is
  op-discrete implies S is discernable
by Th3;
