L. You

activity

20132023

most citedThe expected values of Sombor indices in random hexagonal chains, phenylene chains and Sombor indices of some chemical graphs

36 citations · 67 across the 30 of their papers we have counts for

collaborators

30 papers

math.CO2023

The Turán number of path-star forests

Xiaona Fang, Yaojun Chen, Lihua You

The Turán number of a graph $H$ , denoted by $e x (n, H)$ , is the maximum number of edges in any graph on $n$ vertices containing no $H$ as a subgraph. A linear (star) forest is a fore…

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★ 2 cited

Extremal Kirchhoff index in polycyclic chains

Hechao Liu, Lihua You

The Kirchhoff index of graphs, introduced by Klein and Randić in 1993, has been known useful in the study of computer science, complex network and quantum chemistry. The Kirchhoff…

math.CO2022

Regular graphs with a complete bipartite graph as a star complement

Xiaona Fang, Lihua You, Rangwei Wu +1

Let $G$ be a graph of order $n$ and $μ$ be an adjacency eigenvalue of $G$ with multiplicity $k \geq 1$ . A star complement $H$ for $μ$ in $G$ is an induced subgraph of $G$ of order $…

math.CO2022★ 2 cited

The maximum spectral radius of graphs of given size with forbidden subgraph

Xiaona Fang, Lihua You

Let $G$ be a graph of size $m$ and $ρ (G)$ be the spectral radius of its adjacency matrix. A graph is said to be $F$ -free if it does not contain a subgraph isomorphic to $F$ . In thi…

math.CO2022

The Sombor index and coindex of two-trees

Zenan Du, Lihua You, Hechao Liu +1

The Sombor index of a graph $G$ , introduced by Ivan Gutman, is defined as the sum of the weights $d_{G} (u)^{2} + d_{G} (v)^{2}$ of all edges $uv$ of $G$ , where $d_{G} (u)$ denotes the deg…