Re: Newbie question: equations with sums.
- To: mathgroup at smc.vnet.net
- Subject: [mg92879] Re: [mg92856] Newbie question: equations with sums.
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Thu, 16 Oct 2008 05:06:53 -0400 (EDT)
- Reply-to: hanlonr at cox.net
(Sum[i*f[i], {i, 0, -1 + n}] /. i -> k) ==
Sum[k*f[k], {k, 0, -1 + n}]
True
Bob Hanlon
---- Vend <vend82 at virgilio.it> wrote:
=============
Hello.
FullSimplify[\!\(
\*UnderoverscriptBox[\(\[Sum]\), \(i = 0\), \(\(-1\) + n\)]i\ f[
i]\) == \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(k = 0\), \(\(-1\) + n\)]k\ f[k]\)]
Evaluates to:
\!\(
\*UnderoverscriptBox[\(\[Sum]\), \(i = 0\), \(\(-1\) + n\)]i\ f[
i]\) == \!\(
\*UnderoverscriptBox[\(\[Sum]\), \(k = 0\), \(\(-1\) + n\)]k\ f[k]\)
Why doesn't it evaluate to true? Is there a way to make the system
solve this kind of equations?
--
Bob Hanlon