Dein Wong

activity

20232026

collaborators

Showing 2026Show all

3 papers · 1 filter

math.SP2026

Graphs with maximal Laplacian eigenvalue multiplicity

Songnian Xu, Xiaoya Li, Dein Wong +1

In this paper, $ G $ is a simple connected graph, and $ m_G(λ) $ denotes the multiplicity of $ λ$ as an eigenvalue of the Laplacian matrix $ L(G) $. Let $ p(G) $ denote t…

math.SP2026

The multiplicity of the laplacian eigenvalue 1 of a tree

Songnian Xu, Dein Wong, Wenhao Zhen

Let $G$ be a connected, undirected simple graph. Denote by $L (G)$ the Laplacian matrix of $G$ , and let $m_{G} (λ)$ be the multiplicity of an eigenvalue $λ$ of $L (G)$ . When $G$ is a…

math.GR2026

On automorphism group of the reduced finitary power monoid of the additive group of integers

Dein Wong, Songnian Xu, Chi Zhang +1

Let $Z$ be the additive group of all integers and $N$ the sub-monoid of $Z$ of all non-negative integers. For a finite subset $X$ of $Z$ , we den…