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Xinmin Hou

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Preprint Oct 2026

Tur\'an Numbers of Linear Stars and Expanded Trees

For an $r$-uniform hypergraph $\mathcal H$, let $\ex_r(n,\mathcal H)$ denote the maximum number of edges in an $n$-vertex $r$-uniform hypergraph containing no copy of $\mathcal H$. The $r$-uniform expansion $T^{(r)}$ of a tree $T$ is obtained by adding $r-2$ new vertices to each edge, with the added sets pairwise disjo...

Xin-Min Hou, An-Yao Wang · 0 citations
Preprint Jul 2026

Tight lower bound for the spectral radius of connected graphs with given matching number

Let $\mathscr{G}_{n,k}$ denote the family of all connected graphs of order $n$ with matching number $k$. Liu, Lou, and Trevisan~(Linear Algebra Appl., 2026) posed the following problem: Determine the spectrally minimal graphs in $\mathscr{G}_{n,k}$. In this paper we prove that for every graph $G \in \mathscr{G}_{n,k}$,...

Xinmin Hou, Linquan Tan · 0 citations

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