(Inn) 3. n' 3 n=1

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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This is a mathematical expression representing an infinite series. The series is presented as:

\[
3. \quad \sum_{n=1}^{\infty} \frac{(\ln n)^2}{n^3}
\]

### Explanation:

- **Summation Notation (\(\sum\)):** This symbol indicates that you are summing a sequence of terms. The index \(n\) starts at 1 and goes to infinity (\(\infty\)).

- **Expression (\(\frac{(\ln n)^2}{n^3}\)):** 
  - \(\ln n\) refers to the natural logarithm of \(n\).
  - \((\ln n)^2\) means that this logarithm is squared.
  - This squared logarithm term is divided by \(n^3\).

The series is asking you to sum all terms of this form starting from \(n = 1\) up to infinity. Each term becomes progressively smaller as \(n\) increases, due to the division by \(n^3\). This is a typical expression you'd encounter in advanced calculus or analysis when studying convergence of series.
Transcribed Image Text:This is a mathematical expression representing an infinite series. The series is presented as: \[ 3. \quad \sum_{n=1}^{\infty} \frac{(\ln n)^2}{n^3} \] ### Explanation: - **Summation Notation (\(\sum\)):** This symbol indicates that you are summing a sequence of terms. The index \(n\) starts at 1 and goes to infinity (\(\infty\)). - **Expression (\(\frac{(\ln n)^2}{n^3}\)):** - \(\ln n\) refers to the natural logarithm of \(n\). - \((\ln n)^2\) means that this logarithm is squared. - This squared logarithm term is divided by \(n^3\). The series is asking you to sum all terms of this form starting from \(n = 1\) up to infinity. Each term becomes progressively smaller as \(n\) increases, due to the division by \(n^3\). This is a typical expression you'd encounter in advanced calculus or analysis when studying convergence of series.
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