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Question about Hold

• To: mathgroup at smc.vnet.net
• Subject: [mg48808] Question about Hold
• From: Daohua Song <ds2081 at columbia.edu>
• Date: Thu, 17 Jun 2004 04:07:19 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi,evryone,
    I define a commute relation for quantum operators,i fact i learn this 
from the forum.Here is the problem.
    Commute[A,B]=C.
    Commute[A^2,B], i try to use Hold[A*A] instead of A^2, then mathematica 
even won't evaluate it.!
    Any suggestion to work on the power commutation?
    Thanks
Daohua