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MathGroup Archive 2004

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Re: Problem with the Derivative of a Arg-function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg48627] Re: Problem with the Derivative of a Arg-function
  • From: klishko at mail.ru (Alex Klishko)
  • Date: Tue, 8 Jun 2004 00:48:19 -0400 (EDT)
  • References: <200406040849.EAA23630@smc.vnet.net> <c9sc8g$bst$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Andrzej Kozlowski <akoz at mimuw.edu.pl> wrote in message 

> I suppose you mean -Re[x]+2*Pi*n. But of course for complex  x  Re[x] 
Yes, of course.

> is not differentiable (as a function of the complex variable x !) so 
> Mathematica is quite right not to return -1.

Yes, but Mathematica is not right to return another definite number.  


Best wishes
Alex Klishko


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