The triangular inequality in a metric space (E, d) is

1
d(x, y) ≠ d(x, z) + d(z, y)
2
d(x, y) ≥ d(x, z) + d(z, y)
3
d(x, y) ≤ d(x, z) + d(z, y)
4
none of these

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