Exercise 17: Let (an) be a sequence. a) Assume an> 0 for all n E N...
Let (an) be a sequence such that lim an = 0. Define the sequence (AR) Exercise 21: by A =ļa, and An = zou-a + ax=a + zam for k21. Prove that an converges to some S if and only if Ax converges to S. N=0 k=0 Exercise 22: (Cauchy condensation test) Let (an) be a sequence such that 0 < antı san a) Show n=0 n=1 Hint: Recall the proof of convergence of for p > 1. Ren for...
3.) Let ak E R with ak > 0 for all k E N. Suppose Σ㎞iak converges. Show that Σί1bk (By definition, for a sequence (ck), we say liCkoo if, for all M ER with Hint: Show that there exists (Ni))ไ1 with N > Nj for all j E N, such that bk there exists a sequence (bk)k of real numbers such that lim converges = oo and M >0, there exists N E N such that ck > M...
(b) Suppose that en is a sequence such that 0 <In < 2011 for all n e N. Does lim an exist? If it exists, prove it. If not, give a counterexample. (c) Suppose that in is a sequence such that 0 < < 21 for all n E N.Does lim exist? If it exists, prove it. If not, give a counterexample. 20
(c) A sequence {2n} satisfying 0 < In < 1/n where E(-1)"In diverges.
Suppose that an >0 and bn >0 for all n2N (N an integer). If lim = , what can you conclude about the convergence of an? A. a, diverges if by diverges, and an converges if bn converges. an diverges if by diverges. c. a, converges if be converges. OD. The convergence of an cannot be determined.
Exercise 17.10 Let x = V2 and for n > 1 let In+1 = 2 + In Use Banach's fixed point theorem to show that (en) converges to a root of the equation r' - 4x2 - + 4 = 0 lying between 3 and 2.
Please prove this, thanks! 2. Let {xn n21 be a sequence in R such that all n > 0. If ( lim supra) . (lim supー) = 1 Tn (here we already assume both factors are finite), prove that converges.
i need help with questions17, 18, 19 and 20 please !! Provide an appropriate response. 17) Suppose that an >O and b>0 for all na N(N an integer). If lim , what can you conclude 17) about the convergence of Yan? A) Yan converges it on converges B) Yar divergesit n diverges, and an converges it or converges Yan diverges if on diverges D) The convergence of an cannot be determined. Use the Ratio Test to determine if the series...
7.10 please e) divergence at I = -5? Exercise 7.10. Show that if the sequence and is bounded then the power series > .7 n=0 converges absolutely for p<1. Exercise 7.11. Let A be a set of real numbers with the following property: For every real number Il i) if I, E A then I e A for every I such that I< 1:1), and ii) if I & A then I ¢ A for every I such that :|...
(4) Let(an}n=o be a sequence in C. Define R-i-lim suplanlì/n. Recall that R e [0,x] o0 is the radius of convergence of the power series Σ a (z 20)" Assume that R > 0 (a) Prove that if 0 < ρ < R, then the power series converges uniformly on the closed (b) Prove that the power series converges uniformly on any compact subset of the disk Ix - xo< R (4) Let(an}n=o be a sequence in C. Define R-i-lim...