My Math Forum complex differentiation

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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: 349 Thanks: 67 Math Focus: Calculus That's equivalent to asking where $f(x,y)=\sqrt{x^2+y^2}$ is not differentiable, if that helps. Thanks from topsquark and Nasim

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