# MathSciDoc: An Archive for Mathematician ∫

#### Convex and Discrete Geometry mathscidoc:1912.43539

Comm. Anal. Geom, 2, (4), 627-640, 1994
Let (V, E) denote a graph with vertex set V= V (T) and edge set E= E (). Suppose a group TL acts on V such that:(i) for all g Ti,{gu, gv} GE if and only if {u, v} E,(ii) for any two vertices and v, there is a g T such that guv. Then we say is a homogeneous graph with the associated group Ti. In other words, is vertex-transitive under the action of Ti and We can identify V with the coset space Ti/X where X={g E Ti: gvv}, for a fixed vertex v, denotes the isotropy group. We note that the Cayley graph is a special case of homogeneous graphs with X trivial. The edge set of a homogeneous graph can be described by an (edge) generating set ii H such that each edge of is of the form {v, gv} for some v V, and g . In this paper we require the generating set to be symmetric, ie, g if and only if g^ 1 K. We say that a homogeneous graph is invariant if for every vertex a K, we have aKa-1= K.
```@inproceedings{fan1994a,
title={A Harnack inequality for homogeneous graphs and subgraphs},
author={Fan RK Chung, and Shing-Tung Yau},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224203917371774103},
booktitle={Comm. Anal. Geom},
volume={2},
number={4},
pages={627-640},
year={1994},
}
```
Fan RK Chung, and Shing-Tung Yau. A Harnack inequality for homogeneous graphs and subgraphs. 1994. Vol. 2. In Comm. Anal. Geom. pp.627-640. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224203917371774103.