The sequence looks Cauchy. But I do not know how to approach the proof.
2026-03-26 20:41:57.1774557717
${x_n}$ is a sequence such that $|x_{n+1} - x_n| \leq \frac{1}{2}|x_n - x_{n-1}|$. Prove $x_n$ is convergent.
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