(d) For each N > 0, there is ɛ > 0 such that an - a| < N-¹ when n > N +ɛ.
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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Question
Which of the following statements imply that {an} converges to α?
![(d) For each N > 0, there is ɛ >0 such that |an − a| < N−¹ when n > N +ɛ.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7a04a0c8-a6a9-473e-b4ed-0840bde177a1%2F0fe9211b-731c-42d0-ae8a-6270021a9301%2F6bew1u6_processed.png&w=3840&q=75)
Transcribed Image Text:(d) For each N > 0, there is ɛ >0 such that |an − a| < N−¹ when n > N +ɛ.
Expert Solution
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Step 1: Cauchy statement
Solution:
Since the subsequence {an} converges to a ∈ X, we know that for all ε > 0, there exists
N1 ∈ N such that if nk ≥ N1+ ε then
|an - a| < ε/2.
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