Modulus powers of holomorphic functions are subharmonic
ID: modulus-powers-of-holomorphic-functions-are-subharmonic
For every holomorphic function and , is subharmonic. Away from its zeros the displayed Laplacian calculation proves this. At the zeros, use the smooth approximations , whose Laplacians are nonnegative, and let in their mean inequalities. This permits Poisson integral comparison for fractional modulus powers even when a global analytic fractional power does not exist.
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