Displaying similar documents to “Small integral trees.”

Characterization Results for theL(2, 1, 1)-Labeling Problem on Trees

Xiaoling Zhang, Kecai Deng (2017)

Discussiones Mathematicae Graph Theory

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An L(2, 1, 1)-labeling of a graph G is an assignment of non-negative integers (labels) to the vertices of G such that adjacent vertices receive labels with difference at least 2, and vertices at distance 2 or 3 receive distinct labels. The span of such a labelling is the difference between the maximum and minimum labels used, and the minimum span over all L(2, 1, 1)-labelings of G is called the L(2, 1, 1)-labeling number of G, denoted by λ2,1,1(G). It was shown by King, Ras and Zhou...

Distances between rooted trees

Bohdan Zelinka (1991)

Mathematica Bohemica

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Two types of a distance between isomorphism classes of graphs are adapted for rooted trees.