Ruixue Zhang

activity

20162026

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Showing math.COShow all

4 papers · 1 filter

math.CO2026

A Recursive Characterization of Laplacian Spectral Radii of Trees with Bounded Maximum Degree

Fengming Dong, Ruixue Zhang

For a positive integer $r$ and a real number $α \geq 2$ , let $L_{r} (α)$ be the set of positive real numbers containing $α - 1$ and closed under the following operation: if $q_1,…

math.CO2023

On the colorability of bi-hypergraphs

Meiqiao Zhang, Fengming Dong, Ruixue Zhang

A {\it mixed hypergraph} $H = (V, C, D)$ consists of the vertex set $V$ and two families of subsets of $2^{V}$ : the family $C$ of co-edge…

math.CO2018

Zero-free intervals of chromatic polynomials of mixed hypergraphs

Ruixue Zhang, Fengming Dong

In this paper, we prove that $(- \infty, 0)$ is a zero-free interval for chromatic polynomials of a family $L_{0}$ of hypergraphs and $(0, 1)$ is a zero-free interval for chrom…

math.CO2016

Properties of chromatic polynomials of hypergraphs not held for chromatic polynomials of graphs

Ruixue Zhang, Fengming Dong

In this paper, we present some properties on chromatic polynomials of hypergraphs which do not hold for chromatic polynomials of graphs. We first show that chromatic polynomials of…