Why is Mathematica assuming k==l and how do I make it not to?
- To: mathgroup at smc.vnet.net
- Subject: [mg92588] Why is Mathematica assuming k==l and how do I make it not to?
- From: Aaron Fude <aaronfude at gmail.com>
- Date: Tue, 7 Oct 2008 07:04:51 -0400 (EDT)
As in
Assuming[Element[{k, l}, Integers] ,
Integrate[Cos[k alpha] Cos[l alpha], {alpha, -Pi, Pi}]]
I get 0 whereas the answer is Pi if k=l;
Thanks!
Aaron