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 Author Comment/Response Mike Willhide 03/08/99 06:24am Hi. Newbie here. I'm working on a mechanics problem that requires me to find the limit of a sum as the iterator goes to infinity. Let's see if I can type this... Summation from n=0 to n=infinity of: { e^(2n) * h } + { e^(2n+1) * h} This limit exists if e < 1. Otherwise, it diverges. Here is the meat of my question: How do I tell Mathematica that e will always be less than 1 such that it produces the limit as a function of e and h (analytical solution)? I can obtain numerical solutions by using: Limit[ theSummationPresentedAbove /. {e->NumberLessThanOne, h->AnyValue}, n->infinity ] Does an analytical solution exist, or will it be different with each value of e and h? Also, this doesn't work, can you tell me why? f[MyH_,MyE_] := Limit[ Sum[ {MyE^(2n) * MyH + MyE^(2n+1) * MyH} ], {n, 0, infinity}] It just returns f[ a, b]. Sorry about the length of this post, but it's hard to get these things across without the luxury of Mathematica's notation. Thanks a bundl URL: ,
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