theorem Th29: :: CQC_THE1:33

for Al being QC-alphabet
for X being Subset of (CQC-WFF Al) holds X c= { F where F is Element of CQC-WFF Al : ex f being FinSequence of [:(CQC-WFF Al),Proof_Step_Kinds:] st
( f is_a_proof_wrt X & Effect f = F ) }