Consider the sequence dened by Xn = 1 – 1/n. Make a sketch of this sequence on the real number line. Provide an open set U (an open interval for example) around the limit point of this sequence such that for N = 3 all Xn are in U for all n 2 N.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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**Sequence and Limit Point Analysis**

Consider the sequence defined by \( x_n = 1 - \frac{1}{n} \).

- **Graphical Representation:** 
  This sequence can be visualized on the real number line. As \( n \) increases, the value of \( x_n \) approaches 1. You would observe that for each successive term, the value gets closer to 1 but never actually equals 1.

- **Open Set around the Limit Point:**
  The limit point for this sequence is 1. To define an open set \( U \) around this limit point, we can choose an open interval (for example, \( U = (0.9, 1.1) \)). 

  For \( N = 3 \), all \( x_n \) for \( n \geq N \) are within this open interval \( U \). This implies that starting from \( n = 3 \) onwards, the terms are inside the interval \( (0.9, 1.1) \), indicating that the sequence eventually stays within any neighborhood around the limit point as \( n \) progresses.

This task involves understanding how sequences behave as they progress and how to describe their convergence using limit points and neighborhoods in the context of real analysis.
Transcribed Image Text:**Sequence and Limit Point Analysis** Consider the sequence defined by \( x_n = 1 - \frac{1}{n} \). - **Graphical Representation:** This sequence can be visualized on the real number line. As \( n \) increases, the value of \( x_n \) approaches 1. You would observe that for each successive term, the value gets closer to 1 but never actually equals 1. - **Open Set around the Limit Point:** The limit point for this sequence is 1. To define an open set \( U \) around this limit point, we can choose an open interval (for example, \( U = (0.9, 1.1) \)). For \( N = 3 \), all \( x_n \) for \( n \geq N \) are within this open interval \( U \). This implies that starting from \( n = 3 \) onwards, the terms are inside the interval \( (0.9, 1.1) \), indicating that the sequence eventually stays within any neighborhood around the limit point as \( n \) progresses. This task involves understanding how sequences behave as they progress and how to describe their convergence using limit points and neighborhoods in the context of real analysis.
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