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[函数] 多项式$P(x)$的正实根数≤$e^{ax}P(x)$级数的系数的变号数

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hbghlyj Posted at 2023-5-4 23:49:31 |Read mode
Last edited by hbghlyj at 2024-12-9 11:06:00Wikipedia看到的:
实系数多项式 $P$ 有 $k$ 个正实根,则 $∀a > 0$,函数 $e^{ax}P(x)$ 的Taylor级数的系数的变号数 $≥k$
如何证明呢

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 Author| hbghlyj Posted at 2023-8-29 09:21:52

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2025-4-20 22:11 GMT+8

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