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arXiv 0910.4673math.CAmath.CV
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关于正多项式的一个注记

A remark about positive polynomials

Olga M. Katkova, Anna M. Vishnyakova

摘要:

证明了以下定理。{ \bf定理。}令\it为具有正系数的多项式。如果不等式$\frac{a_{2k+1}^2}{a_{2k}a_{2k+ 2}} < \frac{1}{cos^2(\fracπ{n+2})} $对所有$ k=0, 1, ..., n-1, $成立,则$P(x)>0$对每个$x\in\mathbb{R} $成立。}我们证明了这个定理中的常数$\frac{1}{cos^2(\fracπ{n+2})}$不能增加。我们还提出了这个定理的一些推论。

英文摘要:

The following theorem is proved. {\bf Theorem.} {\it Let $P(x) = \sum_{k=0}^{2n} a_k x^k$ be a polynomial with positive coefficients. If the inequalities $\frac{a_{2k+1}^2}{a_{2k}a_{2k+ 2}} < \frac{1}{cos^2(\fracπ{n+2})} $ hold for all $ k=0, 1, ..., n-1, $ then $P(x)>0$ for every $x\in\mathbb{R} $ .} We show that the constant $\frac{1}{cos^2(\fracπ{n+2})}$ in this theorem could not be increased. We also present some corollaries of this theorem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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