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December 1st, 2016, 12:53 AM   #1
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Unhappy complex differentiation

Hi, I dont know how to check if g(z)=|z| (z is a complex number =x+jy) is differentable or not
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December 1st, 2016, 02:28 AM   #2
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That's equivalent to asking where $f(x,y)=\sqrt{x^2+y^2}$ is not differentiable, if that helps.
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