Xiying Yuan

activity

20142023

most citedMaxima of the Q-index: forbidden even cycles

2 citations · 2 across the 6 of their papers we have counts for

collaborators

6 papers

math.CO2023

Turán problem for $K_{4}^{-}$ -free signed graphs

Fan Chen, Xiying Yuan

Suppose that $G ˙$ is an unbalanced signed graph of order $n$ with $e (G ˙)$ edges. Let $ρ (G ˙)$ be the spectral radius of $G ˙$ , and $K_{4}^{-}$ be the set of…

math.CO2023

Spectral extrema of ${K_{k + 1}, L_{s}}$ -free graphs

Yanni Zhai, Xiying Yuan

For a set of graphs $F$ , a graph is said to be $F$ -free if it does not contain any graph in $F$ as a subgraph. Let Ex $_{s p} (n, F)$ denote the…

math.CO2023

Spectral extrema of graphs: Forbidden star-path forests

Yanni Zhai, Xiying Yuan, Lihua You

A path of order $n$ is denoted by $P_{n}$ , and a star of order $n$ is denoted by $S_{n - 1}$ . A star-path forest is a forest whose connected components are paths and stars. In this pap…

math.CO2022

An upper bound on the nullity of signed graphs

Keming Liu, Xiying Yuan

In this paper, an upper bound on the nullity of signed graphs in terms of the cyclomatic number and the number of pendant vertices is proved, and the corresponding extremal signed…

math.CO2016

The first few unicyclic and bicyclic hypergraphs with larger spectral radii

Chen Ouyang, Liqun Qi, Xiying Yuan

A connected $k$ -uniform hypergraph with $n$ vertices and $m$ edges is called $r$ -cyclic if $n = m (k - 1) - r + 1$ . For $r = 1$ or $2$ , the hypergraph is simply called unicyclic or bicyclic.…

math.CO2014★ 2 cited

Maxima of the Q-index: forbidden even cycles

Vladimir Nikiforov, Xiying Yuan

Let $G$ be a graph of order $n$ and let $q (G)$ be the largest eigenvalue of the signless Laplacian of $G$ . Let $S_{n, k}$ be the graph obtained by joining each vertex o…

Turán problem for K4−​-free signed graphs

Spectral extrema of {Kk+1​,Ls​}-free graphs

Spectral extrema of graphs: Forbidden star-path forests

An upper bound on the nullity of signed graphs

The first few unicyclic and bicyclic hypergraphs with larger spectral radii

Maxima of the Q-index: forbidden even cycles

Turán problem for $K_{4}^{-}$ -free signed graphs

Spectral extrema of ${K_{k + 1}, L_{s}}$ -free graphs