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On the Biclique cover of the complete graph

Combinatorics 2013-01-22 v1

Abstract

Let KK be a set of kk positive integers. A biclique cover of type KK of a graph GG is a collection of complete bipartite subgraphs of GG such that for every edge ee of GG, the number of bicliques need to cover ee is a member of KK. If K={1,2,...,k}K=\{1,2,..., k\} then the maximum number of the vertices of a complete graph that admits a biclique cover of type KK with dd bicliques, n(k,d)n(k,d), is the maximum possible cardinality of a kk-neighborly family of standard boxes in Rd\mathbb{R}^d. In this paper, we obtain an upper bound for n(k,d)n(k,d). Also, we show that the upper bound can be improved in some special cases. Moreover, we show that the existence of the biclique cover of type KK of the complete bipartite graph with a perfect matching removed is equivalent to the existence of a cross KK-intersection family.

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@article{arxiv.1301.4790,
  title  = {On the Biclique cover of the complete graph},
  author = {Farokhlagha Moazami and Nasrin Soltankhah},
  journal= {arXiv preprint arXiv:1301.4790},
  year   = {2013}
}

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