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Re: Problem with the Derivative of a Arg-function


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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