Consider the series E an, and denote by b. = a4k-3+a4k-2+a4k-1+ a4k for k > 1. Assume that an >0 for all n, and E bk is convergent. Prove that E. and E an =Ex=1 bk• An is convergent
Consider the series E an, and denote by b. = a4k-3+a4k-2+a4k-1+ a4k for k > 1. Assume that an >0 for all n, and E bk is convergent. Prove that E. and E an =Ex=1 bk• An is convergent
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:Consider the series E, an, and denote by br
= a4k–3+a4k–2+a4k-1+a4k for
n=1
k > 1. Assume that an >0 for all n, and E br is convergent. Prove that E, am is convergent
n=1
and En-1 an
Σ α Σ bμ
n=1
k=1
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