theorem Th26: :: CALCUL_2:26

for Al being QC-alphabet
for p, q being Element of CQC-WFF Al
for f being FinSequence of CQC-WFF Al st |- (f ^ <*p*>) ^ <*q*> & |- (f ^ <*('not' p)*>) ^ <*q*> holds
|- f ^ <*q*>