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]

**Follow-Ups**:**Re: Abs[x] function***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>