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Abs function

• To: mathgroup at smc.vnet.net
• Subject: [mg47229] Abs function
• From: nikmatz <nikmatz at math.ntua.gr>
• Date: Wed, 31 Mar 2004 02:58:32 -0500 (EST)
• Organization: National Technical University of Athens, Greece
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

i try to find the derivative of abs function

D[Abs[x],x]

and Mathematica answer
Abs`[x]

what mean that

Thanks