A combinatorial proof of Postnikov's identity and a generalized enumeration of labeled trees.
Seo, Seunghyun (2005)
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Displaying similar documents to “Combinatorial interpretation of generalized Stirling numbers.”
A combinatorial proof of Postnikov's identity and a generalized enumeration of labeled trees.
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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...
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