Given a metric spaceX,p> (a) If the sequence (2n)neN C X is convergent, show that it is bounded.
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- Consider the space Z+ with the finite complement topology. Consider the sequence (xn) of points in Z+ given by xn = n+7. To what point or points does the sequence converge?Are the following statements true or false? If true give a proof, and if false give a counter-example: (a)Consider a continuous function f : (0, 1) → R and a Cauchy sequence Xn ∈ (0, 1).Then f(Xn) is also Cauchy. (b)If Xn <a and limn→∞: Xn =l, then l<a. (c) For an, bn ∈ R, consider a sequence of open intervals In = (an, bn).Prove that if the sequence (xn)n is convergent, then its limit is unique.
- 1. Consider the sequence Xn = √n + 1 − √n, n ≥ 1. Prove that (xn)n isconvergent. Find its limit.This is a real analysis question. Let (X,d) be a complete metric space with X not ∅. Suppose the function f : X → X has the property that there exists a constant C ∈ (0, 1) such that d(f(x), f(y)) ≤ Cd(x, y) for all x,y ∈ X. The goal of this problem is to prove that there exists a unique x^∗ ∈ X (a) Let x0 ∈ X be arbitrary. If the sequence {xn, n ∈ N} is defined by setting xn = f(xn−1) for n ∈ N, prove that {xn, n ∈ N} is Cauchy. (b) Since the metric space (X, d) is assumed to be complete, define the limit of the sequence {xn, n ∈ N} from (c) to be x^∗. Prove that f(x^∗) = x^∗. (This establishes existence.)(a) Use the Bernoulli inequality to show that for all n ∈ N: 1 ≤ n1/n ≤ (1+√n)2/n ≤ (1 + 1/√n)2 b) Use part (a) to show that the sequence n1/n is convergent and find its limit
- a) Suppose (an) is Cauchy and that for every k ∈ N, the interval (−1/k, 1/k) contains at least one term of (an). Can we say that (an) converges to 0? Either show that it does or give a counter-example.1. a) Do there exist sequences (an) and (bn) such that lim(anbn) = 1 and (an) diverges?THEOREM 9.10 For a sequence (sn) of positive real numbers, we have lim sn = +∞ if and only if lim(1/sn ) = 0. THEOREM 9.9 Let (sn) and (tn) be sequences such that lim sn = +∞ and lim tn > 0 [lim tn can be finite or +∞]. Then lim sntn = +∞.
- True or false? If lim(xn) = x and lim(yn) = y and for all n, xn < yn, then x < y. If x and y are real numbers with x < y, then there is a rational number q in the interval [x, y]. If R ⊆ S, then S is uncountable. If (xn) converges, then (|xn|) converges. Every infinite subset of an uncountable set is uncountable.d((x1, x2, x3), (y1, y2, y3) = |x1 - y1| + |x2 - y2| + |x3 - y3|. Conclude that, with this metric, a subset of ℝ3 is sequentially compact if and only if it is closed and bounded.Find limits of the following sequences or prove that they are divergent.(a) an =√n(−1)^n