Secondly, we investigate the list coloring of planar graphs, and give a su? Cientcondition for a planar graph being 3-choosable.
其次，文章研究了平面图的列表着色问题，给出了平面图3 -可选的一个充分条件。
In this paper, we investigate star color criticality of graphs and its relationship with color criticality by providing two types of planar graphs which are star color critical but not color critical.
本文对图的星临界性及其与图的临界性之间的关系进行研究，给出了两类星临界但非临界的平面图。
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