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
中科院分区:
文献类型:
--
作者:
L. M. Butler;W. P. Flanigan
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.