MathGroup Archive 2005

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Re: Sum

On Mar 16, 2005, at 5:35 AM, mjumbo wrote:

> Can sombody explain me why
> Sum[Exp[- k], {k, 0, Infinity}]
> gives the correct result, while the following (imho equivalent) 
> statements
> x = Exp[-k]
> Sum[x, {k, 0, Infinity}]
> don't? What should I do to make it work? It is rather vexing to 
> copy/paste long expressions instead of using short placeholders like 
> x.

Sum evaluates its arguments in a nonstandard way,





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