On covering graphs by complete bipartite subgraphs

We prove that, if a graph with e edges contains m vertex-disjoint edges, then m 2 / e complete bipartite subgraphs are necessary to cover all its edges. Similar lower bounds are also proved for fractional covers. For sparse graphs, this improves the well-known fooling set lower bound in communicatio...

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Published in:Discrete mathematics Vol. 309; no. 10; pp. 3399 - 3403
Main Authors: Jukna, S., Kulikov, A.S.
Format: Journal Article
Language:English
Published: Elsevier B.V 28.05.2009
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ISSN:0012-365X, 1872-681X
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Abstract We prove that, if a graph with e edges contains m vertex-disjoint edges, then m 2 / e complete bipartite subgraphs are necessary to cover all its edges. Similar lower bounds are also proved for fractional covers. For sparse graphs, this improves the well-known fooling set lower bound in communication complexity. We also formulate several open problems about covering problems for graphs whose solution would have important consequences in the complexity theory of boolean functions.
AbstractList We prove that, if a graph with e edges contains m vertex-disjoint edges, then m 2 / e complete bipartite subgraphs are necessary to cover all its edges. Similar lower bounds are also proved for fractional covers. For sparse graphs, this improves the well-known fooling set lower bound in communication complexity. We also formulate several open problems about covering problems for graphs whose solution would have important consequences in the complexity theory of boolean functions.
Author Jukna, S.
Kulikov, A.S.
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Issue 10
Keywords Boolean functions
Communication complexity
Edge clique covering number
Fractional covers
Biclique
Language English
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Snippet We prove that, if a graph with e edges contains m vertex-disjoint edges, then m 2 / e complete bipartite subgraphs are necessary to cover all its edges....
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SubjectTerms Biclique
Boolean functions
Communication complexity
Edge clique covering number
Fractional covers
Title On covering graphs by complete bipartite subgraphs
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