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MathGroup Archive 2008

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Abs[x] function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87816] Abs[x] function
  • From: Vladislav <kazimir04 at yahoo.co.uk>
  • Date: Fri, 18 Apr 2008 02:37:15 -0400 (EDT)

Who can explain the behavior. THe derivative Abs[x] at x=.5 is well
defined and is equal to 1.

In[1]:= D[Abs[x], x]

Out[1]=
\!\(\*SuperscriptBox["Abs", "\[Prime]",
MultilineFunction->None]\)[x]

In[2]:= % /. x -> .5

Out[2]=
\!\(\*SuperscriptBox["Abs", "\[Prime]",
MultilineFunction->None]\)[0.5]


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