Another thing to notice here is that,if we put :y = ,since we want |y|<δ, that substitution will lead us to the inequality: δ(δ-2)<0

Αnd since δ>0 we must have δ>2 ,thus imposing a restriction on δ>0

But we must show that for all δ>0 and not just for those greater than 2 the inequalities : |x|<δ ,|y|<δ must hold ,for a certain ε>0