Title
Disproving the Neighborhood Conjecture
Abstract
We study the following Maker/Breaker game. Maker and Breaker take turns in choosing vertices from a given n-uniform hypergraph F, with Maker going first. Maker's goal is to com- pletely occupy a hyperedge and Breaker tries to avoid this. Beck conjectures that if the maximum neighborhood size of F is at most 2n 1 then Breaker has a winning strategy. We disprove this con- jecture by establishing an n-uniform hypergraph with maximum neighborhood size 3 � 2n 3 where Maker has a winning strategy. Moreover, we show how to construct an n-uniform hypergraph with maximum degree 2 n 1 n where Maker has a winning strategy. Finally we show that each n-uniform hypergraph with maximum degree at most 2 n 2 en has a proper halving 2-coloring, which solves another open problem posed by Beck related to the Neighbourhood Conjecture.
Year
Venue
Keywords
2008
Clinical Orthopaedics and Related Research
game theory,maximum degree,discrete mathematics
Field
DocType
Volume
Discrete mathematics,Combinatorics,Mathematical economics,Open problem,Vertex (geometry),Hypergraph,Degree (graph theory),Conjecture,Mathematics
Journal
abs/0810.1
Citations 
PageRank 
References 
0
0.34
2
Authors
1
Name
Order
Citations
PageRank
Heidi Gebauer18311.07