Probabilistic Methods for Decomposition Dimension of Graphs |
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Authors: | Mariko?Hagita André?Kündgen Email author" target="_blank">Douglas B?WestEmail author |
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Institution: | (1) Faculty of Environmental Information, Keio University, 5322, Endoh, Fujisawa, Kanagawa, 252-8520, Japan;(2) Department of Mathematics, California State University San Marcos, CA 92096, USA;(3) Department of Mathematics, University of Illinois, Urbana, IL 61801, USA |
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Abstract: | In a graph G, the distance from an edge e to a set F E(G) is the vertex distance from e to F in the line graph L(G). For a decomposition of E(G) into k sets, the distance vector of e is the k-tuple of distances from e to these sets. The decomposition dimension dec(G) of G is the smallest k such that G has a decomposition into k sets so that the distance vectors of the edges are distinct. For the complete graph K
n
and the k-dimensional hypercube Q
k
, we prove that (2–o(1))lgn dec(K
n
) (3.2+o(1))lgn and k/lgk dec(Q
k
) (3.17+o(1))k/lgk. The upper bounds use probabilistic methods directly or indirectly. We also prove that random graphs with edge probability p such that p
n
1–![epsiv](/content/xw8r622welefvm21/xxlarge603.gif) ![rarr](/content/xw8r622welefvm21/xxlarge8594.gif) for some positive constant have decomposition dimension (lnn) with high probability.
Acknowledgments. The authors thank Noga Alon for clarifying and strengthening the results in Sections 3 and 4. Thanks also go to a referee for repeated careful readings and suggestions.AMS classifications: 05C12, 05C35, 05D05, 05D40 |
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Keywords: | Union-free family Probabilistic method Complete graph Hypercube Random graph Cartesian product |
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