Newbie question: equations with sums.

*To*: mathgroup at smc.vnet.net*Subject*: [mg92856] Newbie question: equations with sums.*From*: Vend <vend82 at virgilio.it>*Date*: Wed, 15 Oct 2008 05:38:04 -0400 (EDT)

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?