Ze-Hui Shao

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math.CO2026

Sharp planar Turán bounds for quasi-double stars

Zehui Shao, Enqiang Zhu, Shaohui Wang

We study $W$ -free planar graphs for $W \in {W_{2, 4}, W_{2, 5}, W_{3, 4}}$ , where the quasi-double star $W_{h, k}$ is obtained from a three-vertex path by attaching $h$ leaves to one end…

math.CO2026

Hamilton-connected cores and five cycle--wheel Ramsey numbers

Zehui Shao, Hanxin Jiang

Let $W_{s} = K_{1} + C_{s - 1}$ denote the wheel on $s$ vertices. We give structural proofs that $R (C_{14}, W_{11}) = 27$ and $R (C_{15}, W_{11}) = 29$ . Together with the theorem of Chen et al. for…