Let S be a subset of the metric space M = (X, d), with point p E X. Question 4. Prove that p is a cluster point of S if and only if p is the limit of a Cauchy sequence in Sn{p}".
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- Show that An has index 2 in Sn, and thereby conclude that An is always a normal subgroup of Sn.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?If ∞ is a cluster point of S ⊂ R if for every M ∈ R, there exists an x ∈ S such that x ≥ M. Similarly −∞ is a cluster point of S ⊂ R if for every M ∈ R, there exists an x ∈ S such that x ≤ M. Prove the limit at ∞ or −∞ is unique if it exists.
- We know that the set S = {1/n : n ∈ N} is not compact because 0 is a limit point of S that is not in S. To see the non-compactness of S in another way, find an open cover of S that does not have a finite subcover!Find the limit of the sequence bn = (cos n)/(n2 + 1).Find the limit of the sequencean= 3n−4/2n+3
- 1. Suppose E⊆X , where X is a metric space, p is a limit point of E , f and g are complex functions on E and fx=A and gx=B . Prove fgx=AB if B≠0Answer question 6. Write each of the following as compactly as possible using summation and "for all" indexed notation.Let an=n+1/n+3. Find the smallest number M such that: 1. |an−1|≤0.001| for n≥M 2.|an−1|≤0.00001 for n≥M 3. Now use the limit definition to prove that limn→∞ an=1. That is, find the smallest value of M (in terms of t) such that |an−1|<t for all n>M.
- Find and prove the limit or deteremine if the limit doesn't exist: n/(n2n-5)Find the maximal value of delta >0 such that, for every x, if 0<|x-2|<delta then |5x-10|<1.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.)