Textbook Question
Explain why or why not Determine whether the following statements are true and give an explanation or counterexample.
a. The sum ∑ (k = 1 to ∞) 1 / 3ᵏ is a p-series.
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14. Sequences & Series
Series
2:55 minutesProblem 10.4.41a
Textbook Question
41–44. {Use of Tech} Remainders and estimates Consider the following convergent series.
a. Find an upper bound for the remainder in terms of n.
41. ∑ (k = 1 to ∞) 1 / k⁶
Verified step by step guidance1
Recognize that the series \( \sum_{k=1}^{\infty} \frac{1}{k^6} \) is a convergent p-series with \( p = 6 > 1 \), which ensures convergence.
To find an upper bound for the remainder \( R_n = \sum_{k=n+1}^{\infty} \frac{1}{k^6} \), use the integral test remainder estimate, which states that \( R_n \leq \int_{n}^{\infty} \frac{1}{x^6} \, dx \).
Set up the improper integral \( \int_{n}^{\infty} x^{-6} \, dx \) to estimate the remainder.
Evaluate the integral: \( \int_{n}^{\infty} x^{-6} \, dx = \lim_{t \to \infty} \int_{n}^{t} x^{-6} \, dx \).
Compute the antiderivative of \( x^{-6} \), which is \( \frac{x^{-5}}{-5} \), then apply the limits from \( n \) to \( \infty \) to express the upper bound for the remainder \( R_n \).
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Video duration:
2mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Convergence of Infinite Series
An infinite series converges if the sum of its terms approaches a finite limit as the number of terms increases. For series like ∑ 1/k⁶, which is a p-series with p > 1, convergence is guaranteed. Understanding convergence is essential to discuss remainders and error bounds.
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Remainder (Error) in Partial Sums
The remainder after n terms of a convergent series is the difference between the infinite sum and the partial sum up to n. Estimating this remainder helps determine how close the partial sum is to the actual sum, which is crucial for approximations and error analysis.
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Integral Test and Remainder Estimation
The integral test can be used to estimate the remainder of a decreasing positive term series by comparing the tail of the series to an improper integral. This provides an upper bound for the remainder, making it a practical tool for bounding errors in series approximations.
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