MathGroup Archive 2005

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Re: Sum

"mjumbo" wrote

>x = Exp[-k]
>Sum[x, {k, 0, Infinity}]
>don't? What should I do to make it work?

Sum has the attribute HoldAll.
So you need to evaluate the expression x passed to it if yuo want it to see
what's inside it.

    Sum[Evaluate[x], {k, 0, Infinity}]


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