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where This summation converges for You can solve this my differentiating the following easy sum however, it is always convenient to know the short cut answer. BTW, I wonder why nobody makes equation search engine for the web. Searching equations with reordering and change of variables would be very helpful. I know mathworld supports a little bit of search but it is not enough. If I only had some time, I would start implementing for Wikipedia formulas with Prolog. Reference: http://www.jstor.org/view/07468342/di020761/02p0031j/0 |