D. Consider R³ with the metric i. Verify that d is really a metric. ii. State and prove the Bolzano-Weierstrass Theorem for R³ with this metric. Hint: Examine the proof for the complex numbers! d((x1, x2, x3), (V1, V2, y3) = |x1-y₁| + x2 - y2 + x3 - y3|.

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