Assume that En=1 an is convergent, and denote by b = a3k-2 + a3k-1 + a3k for k > 1. (a) Prove that E, bk is also convergent and E=1 bk = En=1 an- (b) Does the convergence of =1bk imply the convergence of En=1 an in general?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Real Analysis, Convergent sequences

Exercise 0.2.
Assume that =1 an is convergent, and denote by b
= a3k-2 + a3k–1+a3k for k > 1.
=D1
(a) Prove that E, bk is also convergent and E-1 bk = 2n=1 an.
(b) Does the convergence of =1 b% imply the convergence of En-1 an in general?
Transcribed Image Text:Exercise 0.2. Assume that =1 an is convergent, and denote by b = a3k-2 + a3k–1+a3k for k > 1. =D1 (a) Prove that E, bk is also convergent and E-1 bk = 2n=1 an. (b) Does the convergence of =1 b% imply the convergence of En-1 an in general?
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