let x, y, z be set ; :: thesis: for p being set holds GFA0AdderOutput (x,y,z) <> [p,and2]
let p be set ; :: thesis: GFA0AdderOutput (x,y,z) <> [p,and2]
set A1 = GFA0AdderOutput (x,y,z);

now :: thesis: not [p,and2] `2 = (GFA0AdderOutput (x,y,z)) `2

assume [p,and2] `2 = (GFA0AdderOutput (x,y,z)) `2 ; :: thesis: contradiction
then A1: [p,and2] `2 = xor2 by MCART_1:7;
thus contradiction by A1, TWOSCOMP:9, TWOSCOMP:11; :: thesis: verum

end;

hence GFA0AdderOutput (x,y,z) <> [p,and2] ; :: thesis: verum