reserve Al for QC-alphabet;
reserve i,j,n,k,l for Nat;
reserve a for set;
reserve T,S,X,Y for Subset of CQC-WFF(Al);
reserve p,q,r,t,F,H,G for Element of CQC-WFF(Al);
reserve s for QC-formula of Al;
reserve x,y for bound_QC-variable of Al;
reserve f,g for FinSequence of [:CQC-WFF(Al),Proof_Step_Kinds:];

theorem Th34:
  T is being_a_theory implies TAUT(Al) c= T
proof
  assume
A1: T is being_a_theory;
 Cn({}(CQC-WFF(Al))) c= Cn(T) by Th14,XBOOLE_1:2;
  hence thesis by A1,Th16;
end;
