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More on the Bipartite Decomposition of Random Graphs
Authors:Noga Alon  Tom Bohman  Hao Huang
Institution:1. SACKLER SCHOOL OF MATHEMATICS AND BLAVATNIK SCHOOL OF COMPUTER SCIENCE, TEL AVIV UNIVERSITY, TEL AVIV, ISRAEL;2. SCHOOL OF MATHEMATICS, INSTITUTE FOR ADVANCED STUDY, PRINCETON, NJContract grant number: USA‐Israeli BSF grant;3. contract grant sponsor: ISF grant;4. contract grant sponsor: Israeli I‐Core program and by the Oswald Veblen Fund.;5. DEPARTMENT OF MATHEMATICAL SCIENCES, CARNEGIE MELLON UNIVERSITY, PITTSBURGH, PAContract grant sponsor: NSF;6. contract grant number: DMS‐1362785;7. DEPARTMENT OF MATHEMATICS AND COMPUTER SCIENCE, EMORY UNIVERSITY, ATLANTA, GA
Abstract:For a graph urn:x-wiley:03649024:media:jgt22010:jgt22010-math-0001, let urn:x-wiley:03649024:media:jgt22010:jgt22010-math-0002 denote the minimum number of pairwise edge disjoint complete bipartite subgraphs of G so that each edge of G belongs to exactly one of them. It is easy to see that for every graph G , urn:x-wiley:03649024:media:jgt22010:jgt22010-math-0003, where urn:x-wiley:03649024:media:jgt22010:jgt22010-math-0004 is the maximum size of an independent set of G . Erd?s conjectured in the 80s that for almost every graph G equality holds, that is that for the random graph urn:x-wiley:03649024:media:jgt22010:jgt22010-math-0005, urn:x-wiley:03649024:media:jgt22010:jgt22010-math-0006 with high probability, that is with probability that tends to 1 as n tends to infinity. The first author showed that this is slightly false, proving that for most values of n tending to infinity and for urn:x-wiley:03649024:media:jgt22010:jgt22010-math-0007, urn:x-wiley:03649024:media:jgt22010:jgt22010-math-0008 with high probability. We prove a stronger bound: there exists an absolute constant urn:x-wiley:03649024:media:jgt22010:jgt22010-math-0009 so that urn:x-wiley:03649024:media:jgt22010:jgt22010-math-0010 with high probability.
Keywords:bipartite decomposition  random graph
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