Ratio Monotonicity of Polynomials Derived from Nondecreasing Sequences
Ratio Monotonicity of Polynomials Derived from Nondecreasing Sequences
复制标题
非减序列导出多项式的比率单调性
DOI:
10.37236/486
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发表时间:
2010-07
期刊:
影响因子:
--
通讯作者:
Zhou, Elaine L. F.
中科院分区:
文献类型:
--
作者:
Chen, William Y. C.;Yang, Arthur L.B.;Zhou, Elaine L. F.
The ratio monotonicity of a polynomial is a stronger property than log-concavity. Let $P(x)$ be a polynomial with nonnegative and nondecreasing coefficients. We prove the ratio monotone property of $P(x+1)$, which leads to the log-concavity of $P(x+c)$ for any $c\geq 1$ due to Llamas and Martinez-Bernal. As a consequence, we obtain the ratio monotonicity of the Boros-Moll polynomials obtained by Chen and Xia without resorting to the recurrence relations of the coefficients.
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