Need help on simplifying formula
- To: mathgroup at smc.vnet.net
- Subject: [mg6769] Need help on simplifying formula
- From: j-levy at nwu.edu (Joseph Levy)
- Date: Wed, 16 Apr 1997 02:15:04 -0400 (EDT)
- Organization: Northwestern University
- Sender: owner-wri-mathgroup at wolfram.com
Hello
I hope that anyone can help me with this:
I defined pij,
In[1]:= pij=ai bj Exp[tj(1-ti)]
(1 - ti) tj
Out[1]= ai bj E
and then I computed the derivative of pij by tj, and I got the correct answer
(off course):
In[2]:= D[pij,tj]
(1 - ti) tj
Out[2]= ai bj E (1 - ti)
But when looking carefully, D[pij,tj]==pij (1-ti).
How do I get Mathematica to get this? I tried to work with commands like Rules
and replace.
Any help will be apriciated.
Joseph ("Yossi") Levy Phone : (847) 467-4095
Department of Marketing Fax : (847) 491-2498
Kellogg Graduate School E-mail: j-levy at nwu.edu
Northwestern University