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Section 8.3: The Integral and Comparison Tests; Estimating Sums

Section 8.3: The Integral and Comparison Tests; Estimating Sums. Practice HW from Stewart Textbook (not to hand in) p. 585 # 3, 6-12, 13-25 odd. In this section, we want to determine other methods for determining whether a series converges or diverges. The Integral Test.

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Section 8.3: The Integral and Comparison Tests; Estimating Sums

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  1. Section 8.3: The Integral and Comparison Tests; Estimating Sums Practice HW from Stewart Textbook (not to hand in) p. 585 # 3, 6-12, 13-25 odd

  2. In this section, we want to determine other methods for determining whether a series converges or diverges.

  3. The Integral Test For a function f, if f (x) > 0, is continuous and decreasing for and , then either both converge or both diverge.

  4. Note The integral test is only a test for convergence or divergence. In the case of convergence, it does not find a value for the sum of the series.

  5. Example 1: Determine the convergence or divergence of the series Solution:

  6. Example 2: Determine the convergence or divergence of the series Solution: (In typewritten notes)

  7. Example 3: Show why the integral test cannot be used to analyze the convergence or divergence of the series Solution:

  8. p-Series and Harmonic Series A p-series series is given by If p = 1, then is called a harmonic series.

  9. Convergence of p – series A p-series 1. Converges if p > 1. 2. Diverges if .

  10. Example 4: Determine whether the p-series is convergent or divergent. Solution:

  11. Example 5: Determine whether the p-series is convergent or divergent. Solution:

  12. Example 6: Determine whether the p-series is convergent or divergent. Solution:

  13. Making Comparisons between Series that are Similar Many times we can determine the convergence or divergence of a series by comparing it with the known convergence or divergence of a related series. For example, is close to the p-series , is close to the geometric series .

  14. Under the proper conditions, we can use a series where it is easy to determine the convergence or divergence and use it to determine convergence or divergence of a similar series using types of comparison tests. We will examine two of these tests – the directcomparison test and the limit comparison test.

  15. Direct Comparison Test Suppose that and are series only with positive terms ( and ). 1. If is convergent and for all terms n, is convergent. 2. If is divergent and for all terms n, is divergent.

  16. Example 7: Determine whether the series is convergent or divergent. Solution:

  17. Example 8: Determine whether the series is convergent or divergent. Solution:

  18. Example 9: Demonstrate why the direct comparison test cannot be used to analyze the convergence or divergence of the series Solution:

  19. Limit Comparison Test Suppose that and are series only with positive terms ( and ) and where L is a finite number and L > 0. Then either and either both converge or and both diverge.

  20. Note: This test is useful when comparing with a p-series. To get the p-series to compare with take the highest power of the numerator and simplify.

  21. Example 10: Determine whether the series is convergent or divergent. Solution:

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