theorem Th27: :: SUBSTUT1:27

for A being QC-alphabet
for S being Element of QC-Sub-WFF A holds
( not ( S is Sub_atomic & S is Sub_negative ) & not ( S is Sub_atomic & S is Sub_conjunctive ) & not ( S is Sub_atomic & S is Sub_universal ) & not ( S is Sub_negative & S is Sub_conjunctive ) & not ( S is Sub_negative & S is Sub_universal ) & not ( S is Sub_conjunctive & S is Sub_universal ) & not ( S is A -Sub_VERUM & S is Sub_atomic ) & not ( S is A -Sub_VERUM & S is Sub_negative ) & not ( S is A -Sub_VERUM & S is Sub_conjunctive ) & not ( S is A -Sub_VERUM & S is Sub_universal ) )