theorem
  p is universal implies ex x,q st p = All(x,q)
proof
  assume p is universal;
  then consider x being bound_QC-variable of A,
       q being Element of QC-WFF(A) such that
A1: p = All(x,q) by QC_LANG1:def 21;
  q is Element of CQC-WFF(A) by A1,CQC_LANG:13;
  hence thesis by A1;
end;
