A Note on Log-Convexity of q-Catalan Numbers

A Note on Log-Convexity of q-Catalan Numbers
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DOI:
10.1007/s00026-007-0324-z
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发表时间:
2007-01
影响因子:
0.5
通讯作者:
L. M. Butler;W. P. Flanigan
L. M. Butler;W. P. Flanigan
中科院分区:
数学3区
文献类型:
--
作者:
L. M. Butler;W. P. Flanigan

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Carlitz和Riordan研究的q- catalan数是具有非负系数的多项式。它们求值atq= 1,到加泰罗尼亚数:1,1,2,5,14,…,一个对数凸序列。我们使用这些多项式的组合解释来证明一个-对数凸性结果。在其他作者使用的狭义上,q-加泰罗尼亚数序列不是q-log-凸,因此我们的工作建议采用更灵活的q-log凸定义。
Theq-Catalan numbers studied by Carlitz and Riordan are polynomials inqwith nonnegative coefficients. They evaluate, atq= 1, to the Catalan numbers: 1, 1, 2, 5, 14,…, a log-convex sequence. We use a combinatorial interpretation of these polynomials to prove aq-log-convexity result. The sequence ofq-Catalan numbers is notq-log-convex in the narrow sense used by other authors, so our work suggests a more flexible definition ofq-log convex be adopted.