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December 1st, 2016, 12:53 AM  #1 
Newbie Joined: Dec 2016 From: Tehran,Iran Posts: 1 Thanks: 0  complex differentiation
Hi, I dont know how to check if g(z)=z (z is a complex number =x+jy) is differentable or not

December 1st, 2016, 02:28 AM  #2 
Senior Member Joined: Sep 2007 From: USA Posts: 346 Thanks: 65 Math Focus: Calculus 
That's equivalent to asking where $f(x,y)=\sqrt{x^2+y^2}$ is not differentiable, if that helps.


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