Ping Li

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20232026

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math.CO2025

Planar Turán numbers of three configurations

Xuqing Bai, Zhipeng Gao, Ping Li

The planar Tuán number of $H$ , denoted by $e x_{P} (n, H)$ , is defined as the maximum number of edges in an $n$ -vertex $H$ -free planar graph. The exact value of $ex_{\mathca…

math.CO2025

Dense $2$ -connected planar graphs and the planar Turán number of $2 C_{k}$

Ping Li

Shi, Walsh and Yu demonstrated that any dense planar graph with certain property (known as circuit graph) contains a large near-triangulation. We extend the result to $2$ -connected…

Planar Turán numbers of three configurations

Dense 2-connected planar graphs and the planar Turán number of 2Ck​

Dense $2$ -connected planar graphs and the planar Turán number of $2 C_{k}$