The concept of square-free coloring was introduced in graph theory by Alon in 2002.
无正方形着色的概念由阿龙在2002年引入图论。
2
The coloring theory of graphs is one important branch of graph theory.
图的染色理论是图论中的一个重要分支。
3
In this paper, four types ofgraphcoloring are discussed: dynamic coloring, incidence coloring, entire coloring and edge - face coloring of planar graphs.