Re: Abs function & question about version 5
- To: mathgroup at smc.vnet.net
- Subject: [mg47275] Re: Abs function & question about version 5
- From: "Peter Pein" <no at spam.no>
- Date: Fri, 2 Apr 2004 03:30:18 -0500 (EST)
- References: <c4gf1i$276$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
"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}]