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

**Follow-Ups**:**Re: Re: Problem with the Derivative of a Arg-function***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>

**References**:**Re: Problem with the Derivative of a Arg-function***From:*klishko@mail.ru (Alex Klishko)