theorem Th29: :: BVFUNC11:29

for Y being non empty set
for a being Function of Y,BOOLEAN
for G being Subset of (PARTITIONS Y)
for A, B being a_partition of Y st G is independent holds
All ((Ex (('not' a),A,G)),B,G) '<' 'not' (All ((All (a,B,G)),A,G))