Harmonic Liouville theorem
= Harmonic Liouville theorem
= Liouville theorem for harmonic functions
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A bounded <harmonic function> on the <complex plane> is constant. More generally, an entire harmonic function bounded on either side is constant: write it as $\operatorname{Re}f$ by <harmonic function as the real part of a holomorphic function>, then apply the <Liouville theorem> to $e^f$ or $e^{-f}$.