automorphism group of a graph

例句：

1. 1. The study of graphs and their automorphism groups has become a hot topic in computer science.
   研究图及其自同构群在计算机科学中已成为一个热门话题。
2. 2. In this paper, we introduce the concept of graph automorphism group and give its definition.
   在本文中，我们引入了图自同构群的概念并给出了其定义。
3. 3. The automorphism group of a graph is an important tool for studying the topological properties of graphs.
   图的自同构群是研究图拓扑性质的重要工具。