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Re: Abs function & question about version 5


"nikmatz" <nikmatz at math.ntua.gr> schrieb im Newsbeitrag
news:c4gf1i$276$1 at smc.vnet.net...
> 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 arcand.de",
 Rule@@(ToLowerCase@ToString@Head@#&)/@{William&&S,2b||!2b}]



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