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Jensen's formula

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hbghlyj posted 2022-11-21 18:02 |Read mode
$f$ 为半径为 $R$ 的闭圆盘上的解析函数,假设$f(0)≠0$。令 $f$ 在开圆盘中的根按模长递增排序,重根按重数计入。则$$|f(0)| \leqq \frac{\|f\|_{R}}{R^{N}}\left|z_{1} z_{2} \cdots z_{N}\right|$$

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