Unite series convergence

In summary, the conversation is discussing two series, An and Bn, and how Bn unites with An from some index. The goal is to prove that the limit of An_k is equal to the limit of Bn_m. Bn_m and An_m are sub series, and it is mentioned that the "united" sequence converges if and only if {an} and {bn} converge to the same thing.
  • #1
sedaw
62
0
thres two series An and Bn , Bn unite with An from some index.

need to prove that limAn_k = limBn_m

Bn_m and An_m are sub series .

TNX !
 
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  • #2
Hi there,
I don't really understand your question. Could you detail it a little more? What exactly is this limit? And what do you mean by "unite with"?
 
  • #3
Do you mean alternate sequences so we have [itex]a_n, b_n, a_{n+1}, b_{n+1}, ...[/itex] from some n? In any case, you can't prove what you say- {an} and {bn} could be two independent sequences with completely different limits.

What you can prove (assuming that is what you mean by "unite") is that the "united" sequence converges if and only if {an} and {bn} converge to the same thing.
 

1. What is the definition of convergence in the context of a unite series?

Convergence in the context of a unite series refers to the behavior of the series as the number of terms increases. If the terms of the series approach a finite limit as the number of terms increases, then the series is said to converge. Otherwise, it is said to diverge.

2. How do you determine if a unite series converges or diverges?

To determine if a unite series converges or diverges, you can use various tests such as the ratio test, the root test, or the integral test. These tests analyze the behavior of the series and provide a conclusive answer on convergence or divergence.

3. Can a unite series converge to more than one value?

No, a unite series can only converge to one value. This is because the limit of a series is defined as the limit of the sequence of partial sums, and a sequence can only have one limit.

4. Are there any special cases where a unite series may converge to multiple values?

Yes, there are special cases where a unite series may converge to multiple values. These cases include series with alternating signs or series with terms that decrease at a slower rate. In these cases, the series may converge to more than one value, known as a conditional convergence.

5. How does the rate of convergence affect the behavior of a unite series?

The rate of convergence is a measure of how fast the terms of a series approach the limit. A faster rate of convergence means the series approaches the limit quickly, while a slower rate of convergence means the series approaches the limit more slowly. In general, a series with a faster rate of convergence is considered to be more well-behaved and easier to work with.

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