Hao Liang

activity

20122026

most citedEquations in nilpotent groups

2 citations · 3 across the 11 of their papers we have counts for

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Showing 2012Show all

3 papers · 1 filter

math.CO2012

On the minimal feedback arc set of m-free Digraphs

Hao Liang, Jun-Ming Xu

For a simple digraph $G$ , let $β (G)$ be the size of the smallest subset $X \subseteq E (G)$ such that $G - X$ has no directed cycles, and let $γ (G)$ be the number of unordered pairs of…

math.CO2012

A note on directed 4-cycles in digraphs

Hao Liang, Jun-Ming Xu

Using some combinatorial techniques, in this note, it is proved that if $α \geq 0.28866$ , then any digraph on $n$ vertices with minimum outdegree at least $α n$ contains a directed c…

math.GR2012★ 1 cited

Centralizers of Finite Subgroups of the Mapping Class Group

Hao Liang

In this paper, we study the action of finite subgroups of the mapping class group of a surface on the curve complex. We prove that if the diameter of the almost fixed point set of…