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Michael Albanese
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A function $f : M \to \mathbb{C}$ satisfying $\partial\bar{\partial}f = 0$ is called pluriharmonic. In any complex coordinates, a pluriharmonic function is harmonic so it satisfies the maximum principle. It follows that such a function must be locally constant if $M$ is compact (i.e. constant on each connected component of $M$).

Michael Albanese
  • 19.4k
  • 9
  • 87
  • 161