let Y be non empty set ; :: thesis: for a being Element of Funcs Y,BOOLEAN
for G being Subset of (PARTITIONS Y)
for A, B being a_partition of Y st G is independent holds
Ex ('not' (All a,A,G)),B,G '<' Ex (Ex ('not' a),B,G),A,G
let a be Element of Funcs Y,BOOLEAN ; :: thesis: for G being Subset of (PARTITIONS Y)
for A, B being a_partition of Y st G is independent holds
Ex ('not' (All a,A,G)),B,G '<' Ex (Ex ('not' a),B,G),A,G
let G be Subset of (PARTITIONS Y); :: thesis: for A, B being a_partition of Y st G is independent holds
Ex ('not' (All a,A,G)),B,G '<' Ex (Ex ('not' a),B,G),A,G
let A, B be a_partition of Y; :: thesis: ( G is independent implies Ex ('not' (All a,A,G)),B,G '<' Ex (Ex ('not' a),B,G),A,G )
assume G is independent ; :: thesis: Ex ('not' (All a,A,G)),B,G '<' Ex (Ex ('not' a),B,G),A,G
then Ex (Ex ('not' a),B,G),A,G = Ex (Ex ('not' a),A,G),B,G by PARTIT_2:18;
hence Ex ('not' (All a,A,G)),B,G '<' Ex (Ex ('not' a),B,G),A,G by BVFUNC_2:20; :: thesis: verum