reserve A for QC-alphabet;
reserve p, q, r, s for Element of CQC-WFF(A);

theorem
  'not' p 'or' p in TAUT(A)
proof
  ( p 'or' 'not' p ) => ( 'not' p 'or' p ) in TAUT(A) by Th8;
  hence thesis by Th2,CQC_THE1:46;
end;
