(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?
Expert Solution
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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