theorem :: BVFUNC14:25

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 <> E & B <> E & C <> E & D <> E holds
CompF (E,G) = ((A '/\' B) '/\' C) '/\' D