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MathGroup Archive 2004

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Re: Abs function & question about version 5

  • To: mathgroup at
  • Subject: [mg47275] Re: Abs function & question about version 5
  • From: "Peter Pein" <no at>
  • Date: Fri, 2 Apr 2004 03:30:18 -0500 (EST)
  • References: <c4gf1i$276$>
  • Sender: owner-wri-mathgroup at

"nikmatz" <nikmatz at> schrieb im Newsbeitrag
news:c4gf1i$276$1 at
> 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

f'[x] is an abbreviation of Derivative[f][1][x]

b.t.w.: what happened to Mathematica's creativity regarding

In[1]:= $Version
        FullSimplify[Abs'[x], x \[Element] Reals]
Out[1]= "4.0 for Microsoft Windows (July 16, 1999)"
Out[2]= Sign[x]

in version 5?

Peter Pein, Berlin
StringReplace["petsie at",

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