Confirming Convergence: $\sum \frac{(-1)^{n+1}(n^2+4)^{1/3}}{(n^5+1)^{1/2}}$

In summary, the purpose of confirming convergence is to determine whether a given mathematical series will approach a definite limit or continue to increase indefinitely. This can be done using various tests such as the ratio test, comparison test, or the root test. The significance of alternating signs in the series is that it can affect its overall behavior and convergence or divergence. While the terms in a series may approach zero, it is still possible for the series to diverge if the rate of decrease is not fast enough. The power in the numerator and denominator can also impact the convergence of the series by altering the rate at which the terms approach zero.
  • #1
duki
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Homework Statement



[tex]\sum \frac{(-1)^{n+1}(n^2+4)^{1/3}}{(n^5+1)^{1/2}}[/tex]

Homework Equations



The Attempt at a Solution



I got that it converges, because the limit is 0
Is that right?
 
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  • #2
You apparently are using the alternating series test. Have you established all of the following?
The a_n's are all positive.
a_n >= a_(n+1) for all n.
lim a_n = 0, as n approaches infinity.
 

1. What is the purpose of confirming convergence?

The purpose of confirming convergence is to determine whether a given mathematical series will approach a definite limit or continue to increase indefinitely. This information is important in understanding the behavior and properties of the series.

2. How do you determine convergence using the given series?

To determine convergence, we can use various tests such as the ratio test, comparison test, or the root test. In this particular series, the ratio test can be used to confirm convergence by checking the limit of the absolute value of the ratio of consecutive terms.

3. What is the significance of the alternating signs in the series?

The alternating signs in the series indicate that the terms are alternately positive and negative. This is important because it affects the overall behavior of the series and can have an impact on its convergence or divergence.

4. Can the series diverge even if the terms approach zero?

Yes, it is possible for a series to have terms that approach zero, but still diverge. This is because the rate at which the terms approach zero may not be fast enough to overcome the increasing terms in the series.

5. How does the power in the numerator and denominator affect the convergence of the series?

The power in the numerator and denominator can affect the convergence of the series by altering the rate at which the terms approach zero. In this series, the power of 1/3 in the numerator and 1/2 in the denominator indicates that the terms will approach zero at a slower rate, making it more likely for the series to converge.

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