On L(2,1)-Labelings of Oriented Graphs
DISCUSSIONES MATHEMATICAE GRAPH THEORY（2022）
摘要
We extend a result of Griggs and Yeh about the maximum possible value of the L(2, 1)-labeling number of a graph in terms of its maximum degree to oriented graphs. We consider the problem both in the usual definition of the oriented L(2, 1)-labeling number and in some variants we introduce.
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关键词
L(2, 1)-labeling, directed graphs
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