Let Xn=nn for n EN * Show that Xn+₁

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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Let \( X_n := n^{1/n} \) for \( n \in \mathbb{N} \).

- Show that \( X_{n+1} < X_n \) if and only if \( \left(1 + \frac{1}{n}\right)^n < n \).

- Show that the inequality is valid for \( n \geq 3 \).

- Conclude that \( X_n \) is ultimately decreasing.

- Show that the limit \( x := \lim(X_n) \) exists.

- Use the fact that the subsequence \( (X_{2n}) \) also converges to \( x \) to show that \( x = 1 \).
Transcribed Image Text:Let \( X_n := n^{1/n} \) for \( n \in \mathbb{N} \). - Show that \( X_{n+1} < X_n \) if and only if \( \left(1 + \frac{1}{n}\right)^n < n \). - Show that the inequality is valid for \( n \geq 3 \). - Conclude that \( X_n \) is ultimately decreasing. - Show that the limit \( x := \lim(X_n) \) exists. - Use the fact that the subsequence \( (X_{2n}) \) also converges to \( x \) to show that \( x = 1 \).
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