On 2012-05-09 22:35, Kjetil brinchmann Halvorsen wrote:
> sage: k = var('k')
> sage: (1/k**4).sum(k,1,00)
> 0
>
> sage: sum(1/k**4,k,1,00)
>
>
> Kjetil
>
Are you confusing 00 with oo for infinity:
sage: var('k')
k
sage: sum(1/k**4,k,1,oo)
1/90*pi^4
sage: sum(1/k**4,k,1,Infinity)
1/90*pi^4
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