theorem Th21: :: BVFUNC14:21

for Y being non empty set
for G being Subset of (PARTITIONS Y)
for A, B, C, D, E being a_partition of Y st G = {A,B,C,D,E} & A <> B & A <> C & A <> D & A <> E holds
CompF (A,G) = ((B '/\' C) '/\' D) '/\' E