Ratio Monotonicity of Polynomials Derived from Nondecreasing Sequences

Details Ratio Monotonicity of Polynomials Derived from Nondecreasing Sequences Ratio Monotonicity of Polynomials Derived from Nondecreasing Sequences

2010-07-28

arxiv.org/abs/1007.5017v1

Mathematics

Combinatorics

9 pages

Scientific paper

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 Mart\'{\i}nez-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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