Chunyang Dou

activity

20242026

collaborators

4 papers

math.CO2026

Spectral TurÃ¡n problems for suspensions of balanced trees

Yaoxiang Di, Chunyang Dou

A central problem in spectral TurÃ¡n theory is to understand the relationship between the spectral extremal family $SPEX (n, F)$ and the ordinary extremal family ${\rm EX}(n,F)…

math.CO2026

Counting triangles in graphs with no wheels of order at least five

Chunyang Dou, Bo Ning, Xing Peng

For a family of graphs $F$ , a graph $G$ is said to be $F$ -free if it contains no member of $F$ as a subgraph. A wheel graph $W_{k}$ is a graph on $k + 1$ ver…

math.CO2025

The Ramsey number of the 4-cycle versus a book graph

Chunyang Dou, Tianyu Li, Qizhong Lin +1

Given positive integers $n$ and $k$ , the book graph $B_{n}^{(k)}$ consists of $n$ copies of $K_{k + 1}$ sharing a common $K_{k}$ . The book graph is a common generalization of a star and…

math.CO2024

TurÃ¡n numbers of cycles plus a general graph

Chunyang Dou, Fu-tao Hu, Xing Peng

For a family of graphs $F$ , a graph $G$ is $F$ -free if it does not contain a member of $F$ as a subgraph. The TurÃ¡n number $ex (n, F)$ is the maximum…