Yuzhenni Wang

collaborators

2 papers

math.CO2026

The Sharp Upper Bounds for the Median Eigenvalues of Graphs

Zhengbo Chen, Yuzhenni Wang, Xiao-Dong Zhang

Let $λ_{1} \geq λ_{2} \geq \dots \geq λ_{n}$ be the eigenvalues of a simple graph $G$ of order $n$ . The HL-index of $G$ is defined by $R (G) = max ∥ λ_{h} ∣, ∣ λ_{ℓ} ∣}$ with $h=\lfloor(n+1)/2\rfloo…

math.CO2024

A class of trees determined by their chromatic symmetric functions

Yuzhenni Wang, Xingxing Yu, Xiao-Dong Zhang

Stanley introduced the concept of chromatic symmetric functions of graphs which extends and refines the notion of chromatic polynomials of graphs, and asked whether trees are deter…