Does the sequence decrease and converge to zero?
That is the alternating series test.
Now does the series converge?
If not then the convergence is not absolute.
I understand all that. What I am trying to figure out is since I have shown that does indeed converge. Does it converge conditionally because of the ? This was a question on a test that I had this morning. It was a two part question. The first part I had to show what test I would use to figure out if it converged or not. I used the Alternating Series test and found that , , and that it was alternating, which proves that the series converges. For part b, it asked me to show if it converged conditionally or absolutely. I said it converged conditionally. It converged because it met the criteria for an alternating series. However, with I said that by having this as part of the series, it would affect its convergence because it caused the values to bounce around and not hone in on a specific value. Is that right or no?
Thanks for the response!
Wow, ok, sorry. I guess I may have left something out of the question, it is just from memory. I do understand this concept, I just wanted some clarification on the process of conditionally vs. absolute. I'll see if I can clarify the actual problem with my professor and re post.
Ok, so I got a response back from my professor. It is true that the series diverges. But with the it converges conditionally. I was confused, because I just thought that if a series is divergent, it's divergent. Period. I think I just assumed that for a series to be conditionally convergent, it began as convergent and due to making a change to it i.e. made it be conditionally convergent. Anyway, looks like I solved it correctly on my test, but didn't look at the series long enough to realize that it was actually divergent.