I was reading a book of neural networks in Spanish and I do not understand the inequalities on page 26
the book: http://disi.unal.edu.co/~lctorress/RedNeu/LiRna004.pdf
I have a table of XOR and inequality restrictions
if there are no contradictions in the previous inequalities, the problem is linearly separable, as observed from the inequalities 2, 3, 4 is impossible
and that its sum is less than zero
my question is how that result of contradiction(inequalities 2,3,4)