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Quaternion problem

• To: mathgroup at smc.vnet.net
• Subject: [mg67387] Quaternion problem
• From: "Staffan Langin" <I_Hate_Spam at nowhere.com>
• Date: Wed, 21 Jun 2006 02:13:05 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hello,

I'm a total Mathematica newbee so please bear with me :-). I'm trying to let 
Mathematica analytically evaluate a second order derivative for me. The 
function has several parameters with some of them being of 
"Quaternion-type". I want to instruct Mathematica that the commutative rule 
doesn't apply when evaluation the function. Is that possible? Thanks in 
advance.

Staffan Langin