I don't even know where to start, so some starting points would be appreciated. Thanks!
(Greene and Krantz Function Theory of one complex variable, Chapter 7 ex. 13)
2026-04-07 07:52:24.1775548344
If $u$ is complex valued and harmonic on a connected open set, and if $u^2$ is harmonic, then either $u$ is holomorphic or $\bar{u}$ is
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