Let X = R² with metric d((x₁, y₁), (x2, y2)) := √(x2 − X1₁)² + (Y2 — Y1)². - Prove that the sequences (2) converges. Is it a Cauchy sequences?

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A: 3.

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Q: Show that a, converges to A iff {a, - A) converges to 0.

A: Answer