lsum?

• Subject: lsum?
• From: John Lapeyre
• Date: Mon, 3 May 2010 09:57:36 +0200

On Monday 03 May 2010 04:51:53 Raymond Toy wrote:

> gg : x^3+t*x^2-3*x-2*t$
> lsum(gg*t,t,rootsof(t^2+1));
> ->
> ?%lsum(gg*t,t,rootsof(t^2+1))$
> Shouldn't gg be substituted?  How can I do this?

  I think your problem is in the list:

(%i1) gg : x^3+t*x^2-3*x-2*t$
(%i2) rts : [-%i,%i]$
(%i3) lsum(gg*t,t,rts);
(%o3)                                  0

regards,
John

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