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Infinite Series 9 Copyright © Cengage Learning. All rights reserved.

The Integral Test and p-Series Copyright © Cengage Learning. All rights reserved.

3 Use the Integral Test to determine whether an infinite series converges or diverges. Use properties of p-series and harmonic series. Objectives

4 The Integral Test

5

6 Example 1 – Using the Integral Test Apply the Integral Test to the series Solution: The function is positive and continuous for To determine whether f is decreasing, find the derivative.

7 Example 1 – Solution So, f'(x) 1 and it follows that f satisfies the conditions for the Integral Test. You can integrate to obtain So, the series diverges. cont'd

8 p-Series and Harmonic Series

9 A second type of series has a simple arithmetic test for convergence or divergence. A series of the form is a p-series, where p is a positive constant. For p = 1, the series is the harmonic series. p-Series and Harmonic Series

10 A general harmonic series of the form In music, strings of the same material, diameter, and tension, whose lengths form a harmonic series, produce harmonic tones. p-Series and Harmonic Series

11 Example 3 – Convergent and Divergent p-Series Discuss the convergence or divergence of (a) the harmonic series and (b) the p-series with p = 2. Solution: a.From Theorem 9.11, it follows that the harmonic series diverges. b. From Theorem 9.11, it follows that the p-series converges.