Xingzhi Zhan

activity

20152022

most citedProof of a conjecture on hamiltonian-connected graphs

1 citations · 3 across the 17 of their papers we have counts for

collaborators

Showing 2020Show all

3 papers · 1 filter

math.CO2020

The Turán number of book graphs

Jingru Yan, Xingzhi Zhan

Given a graph $H$ and a positive integer $n,$ the Turán number of $H$ for the order $n,$ denoted $ex (n, H),$ is the maximum size of a simple graph of order $n$ not containing…

math.CO2020

Possible cardinalities of the center of a graph

Yanan Hu, Xingzhi Zhan

A central vertex of a graph is a vertex whose eccentricity equals the radius. The center of a graph is the set of all central vertices. The central ratio of a graph is the ratio of…

math.CO2020

On a problem of Erdős about graphs whose size is the Turán number plus one

Pu Qiao, Xingzhi Zhan

We consider finite simple graphs. Given a graph $H$ and a positive integer $n,$ the Turán number of $H$ for the order $n,$ denoted $ex (n, H),$ is the maximum size of a graph o…