Re: Mathematica 8 does not like Sum[1/k,{k,n,10}]
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- Subject: [mg130773] Re: Mathematica 8 does not like Sum[1/k,{k,n,10}]
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Mon, 13 May 2013 03:49:23 -0400 (EDT)
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Perhaps you want:
Sum[1/k, {k, n, 8, -1}]
On May 12, 2013, at 3:29 AM, valvola <g.resta at iit.cnr.it> wrote:
> Apparently, Mathematica 8 does not like the simple expression:
>
> Clear[k,n]; Sum[1/k,{k,n,8}]
>
> The result is two errors:
> Power::infy: "Infinite expression 1/0 encountered."
>
> and a large expression
> DifferenceRoot[
> Function[{\[FormalY], \[FormalN]}, {\[FormalN] \
> \[FormalY][\[FormalN]] + .... etc.etc.
>
> By the way, the similar Sum[1/k, {k, 8, n}] works fine.
>
> ????
> g.
---
Murray Eisenberg murray at math.umass.edu
Mathematics & Statistics Dept.
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University of Massachusetts 413 545-2838 (W)
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Amherst, MA 01003-9305
- References:
- Mathematica 8 does not like Sum[1/k,{k,n,10}]
- From: valvola <g.resta@iit.cnr.it>
- Mathematica 8 does not like Sum[1/k,{k,n,10}]