Yaojun Chen

activity

20232026

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math.CO2024

Disproofs of four Gallai-Ramsey-type conjectures

Yanbo Zhang, Yaojun Chen

As a significant variation of Ramsey numbers, the Gallai-Ramsey number $G R_{k} (H)$ refers to the smallest positive integer $r$ such that, by coloring the edges of $K_{r}$ with at most…

math.CO2024

Generalized Turán problem for a path and a clique

Xiaona Fang, Xiutao Zhu, Yaojun Chen

Let $H$ be a family of graphs. The generalized Turán number $e x (n, K_{r}, H)$ is the maximum number of copies of the clique $K_{r}$ in any $n$ -vertex $H$ -…