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Let $D = B(0; 1)$ be the unit open ball in $\mathbb{C}$. Let $u: D \rightarrow \mathbb{R}$ be a continuous function such that $u$ is subharmonic in $D \setminus \{ 0 \}$. How to prove that $u$ is subharmonic in $D$?

Thank you!

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    I notice that there's no question here ... $\:$2012-10-30
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    Why? It is nontrivial that u is subharmonic in the origin.2012-10-30

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