3. Let (X, d) be a metric space. Assume that (Xn) is a sequence in X with a subsequence (Xn;) converging to a E X; that
Posted: Sat Feb 26, 2022 10:58 am
3. Let (X, d) be a metric space. Assume that (Xn) is a sequence in X with a subsequence (Xn;) converging to a E X; that is, there is a strictly increasing sequence of natural numbers ni < n2 < n3 < such that xn; + a as i +0. Show that if (xn) is Cauchy, then xn + a as n + 0. [Marks: 5]