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Abs function

• To: mathgroup at smc.vnet.net
• Subject: [mg47238] Abs function
• From: nikmatz <nikmatz at math.ntua.gr>
• Date: Wed, 31 Mar 2004 02:59:39 -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[x]
and i have this

In: D[Abs[x],x]

Out: Abs`[x]

i don't know the mean of `

please help

Thanks