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Re: Derivative of a sum.

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  • Subject: [mg101651] Re: Derivative of a sum.
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at>
  • Date: Sun, 12 Jul 2009 06:57:12 -0400 (EDT)
  • References: <h390no$jri$>

I seem to have some difficulties interpreting your question.
Your summing over i but there's now i in the summand, or this (in i)
must mean something. And the derivative is with respect to which

Cheers -- Sjoerd

On Jul 11, 5:25 am, "Muntoni Giampaolo" <muntoni.gia... at>
> In order to resolve a problem I have found the question of derivating  =
> expression e^(-x)*Sum(in i)(x^n/n!, (i,0,n));the solution is easy and is
> e^(-x)(x^n/n!).
> But using language of Mathematica I have obteined a different result with=
> ricorse of Gamma function...also recurring to the option of manipulate,
> changing the value of  integer n.
> I would want to obtain the exact result with language of Mathematica and
> Manipulate respect to n and also plotting the original function and its
> derivative.(with manipulate)
> Thanks for aids
> Giampaolo

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