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- Let (fn) be a sequence of Lebesgue measurable functions on [a, b] such that fn → funiformly on [a, b]. Show thatZ baf = limn→∞ Z bafn.Let A be a non-empty and bounded subset of R, and let x_0=supA. Prove that x_0 ∈ A or that x_0 is an accumulation pt of A.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).
- (a) Prove that a bounded function f is integrable on [a, b] if and only if there exists a sequence of partitions (Pn)∞n=1 satisfyingFind limits of the following sequences or prove that they are divergent.(a) an =√n(−1)^na)Let A = {x ∈ R + : x 2 < 2} . Explain why A i bounded above and below and find sup(A) and inf(A). b) Prove and give an example that if A and B are two bounded non-empty subset of R, then A ∪ B is also bounded
- We denote by ∞ the space of all bounded sequences (an)∞n=1.For example,(1, −2, 1, −2, 1, −2,...) ∈ ∞ .Define addition and scalar multiplication by(an)∞n=1 + (bn)∞n=1 = (an + bn)∞n=1 andc(an)∞n=1 = (can)∞n=1 .a) Let ||(an)∞n=1|| = supn|an|. Show that || · || is a norm on ∞.b) Show that ∞ is complete with respect to this norm.In other words, prove ∞ is a Banach space.(a) Let A be nonempty and bounded below, and define B ={b ∈ R : b is a lower bound for A}. Show that supB = inf A. (b) Use (a) to explain why there is no need to assert that greatest lower bounds exist as part of the Axiom of Completeness.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.