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Re: Abs function

• To: mathgroup at smc.vnet.net
• Subject: [mg47267] Re: Abs function
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Fri, 2 Apr 2004 03:30:10 -0500 (EST)
• Organization: Universitaet Leipzig
• References: <c4ge4p$5a$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

tha mean that the derivative of Abs[] can be different for
real and complex arguments. For real arguments you have

D[Abs[x], x] // FullSimplify[#, Element[x, Reals]] &

Sign[x]

Regards
  Jens


nikmatz wrote:
> 
> Hi,
> 
> i try to find the derivative of abs function
> 
> D[Abs[x],x]
> 
> and Mathematica answer
> Abs`[x]
> 
> what mean that
> 
> Thanks