Problem 1E Determining Convergence or Divergence In Exercise, determine if the alternating series converges or diverges. Some of the series do not satisfy the conditions of the Alternating Series Test.
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Textbook Solutions for Thomas' Calculus: Early Transcendentals
Question
Problem 61E
Theory and Examples
The sign of the remainder of an alternating series that satisfies the conditions of Theorem 14 Prove the assertion in Theorem 15 that whenever an alternating series satisfying the conditions of Theorem 14 is approximated with one of its partial sums, then the remainder (sum of the unused terms) has the same sign as the first unused term. (Hint: Group the remainder’s terms in consecutive pairs.)
Reference:
THEOREM 15— The Alternating Series Estimation Theorem If the alternating seriessatisfies the three conditions of Theorem 14, then for n ≥ N
approximates the sum L of the series with an error whose absolute value is less than un+1 the absolute value of the first unused term. Furthermore, the sum L lies between any two successive partial sums sn and sn+1 and the remainder, L - sn , has the same sign as the first unused term.
THEOREM 14— The Alternating Series Test (Leibniz’s Test) The series
converges if all three of the following conditions are satisfied:
1. The un’s are all positive.
2. The positive un’s are (eventually) non-increasing: for some integer N.
3.
Solution
The first step in solving 10.6 problem number 61 trying to solve the problem we have to refer to the textbook question: Problem 61ETheory and ExamplesThe sign of the remainder of an alternating series that satisfies the conditions of Theorem 14 Prove the assertion in Theorem 15 that whenever an alternating series satisfying the conditions of Theorem 14 is approximated with one of its partial sums, then the remainder (sum of the unused terms) has the same sign as the first unused term. (Hint: Group the remainder’s terms in consecutive pairs.)Reference:THEOREM 15— The Alternating Series Estimation Theorem If the alternating seriessatisfies the three conditions of Theorem 14, then for n ≥ Napproximates the sum L of the series with an error whose absolute value is less than un+1 the absolute value of the first unused term. Furthermore, the sum L lies between any two successive partial sums sn and sn+1 and the remainder, L - sn , has the same sign as the first unused term.THEOREM 14— The Alternating Series Test (Leibniz’s Test) The seriesconverges if all three of the following conditions are satisfied:1. The un’s are all positive.2. The positive un’s are (eventually) non-increasing: for some integer N.3.
From the textbook chapter Alternating Series and Conditional Convergence you will find a few key concepts needed to solve this.
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