Which of the following sets is not finite? 

1
{(x, y) : x2 + y2 ≤ 1 ≤ x + y, x, y ∈ R}
2
{(x, y) : x2 + y2 ≤ 1 ≤ x + y, x, y ∈ Z}
3
{(x, y) : x2  y ≤ |x|, x, y ∈ Z}
4
{(x, y) : x2 + y2 = 1, x, y ∈ Z}

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