theorem Th32:
  X |- p & X c= Y implies Y |- p
proof
  assume that
A1: X |- p and
A2: X c= Y;
  consider f being FinSequence of CQC-WFF(Al) such that
A3: rng f c= X and
A4: |- f^<*p*> by A1,HENMODEL:def 1;
  rng f c= Y by A2,A3;
  hence thesis by A4,HENMODEL:def 1;
end;
