let Y be 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
'not' (Ex ((All (a,A,G)),B,G)) '<' 'not' (All ((All (a,B,G)),A,G))
let a be Function of Y,BOOLEAN; for G being Subset of (PARTITIONS Y)
for A, B being a_partition of Y st G is independent holds
'not' (Ex ((All (a,A,G)),B,G)) '<' 'not' (All ((All (a,B,G)),A,G))
let G be Subset of (PARTITIONS Y); for A, B being a_partition of Y st G is independent holds
'not' (Ex ((All (a,A,G)),B,G)) '<' 'not' (All ((All (a,B,G)),A,G))
let A, B be a_partition of Y; ( G is independent implies 'not' (Ex ((All (a,A,G)),B,G)) '<' 'not' (All ((All (a,B,G)),A,G)) )
assume
G is independent
; 'not' (Ex ((All (a,A,G)),B,G)) '<' 'not' (All ((All (a,B,G)),A,G))
then
All (('not' (All (a,A,G))),B,G) '<' 'not' (All ((All (a,B,G)),A,G))
by Th26;
hence
'not' (Ex ((All (a,A,G)),B,G)) '<' 'not' (All ((All (a,B,G)),A,G))
by BVFUNC_2:19; verum