On Unimodality Problems in Pascal's Triangle

Author:

Su Xun-Tuan,Wang Yi

Abstract

Many sequences of binomial coefficients share various unimodality properties. In this paper we consider the unimodality problem of a sequence of binomial coefficients located in a ray or a transversal of the Pascal triangle. Our results give in particular an affirmative answer to a conjecture of Belbachir et al which asserts that such a sequence of binomial coefficients must be unimodal. We also propose two more general conjectures.

Publisher

The Electronic Journal of Combinatorics

Subject

Computational Theory and Mathematics,Geometry and Topology,Theoretical Computer Science,Applied Mathematics,Discrete Mathematics and Combinatorics

Cited by 11 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Refined ratio monotonicity of the coordinator polynomials of the root lattice of type B n ;Open Mathematics;2023-01-01

2. Some analytical properties of the matrix related to q-coloured Delannoy numbers;Proceedings of the Edinburgh Mathematical Society;2022-08

3. Total Positivity from the Exponential Riordan Arrays;SIAM Journal on Discrete Mathematics;2021-01

4. Analytic aspects of Delannoy numbers;Discrete Mathematics;2019-08

5. Total positivity of Riordan arrays;European Journal of Combinatorics;2015-05

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