Title
A counterexample to a conjecture of Schwartz.
Abstract
In 1990, motivated by applications in the social sciences, Thomas Schwartz made a conjecture about tournaments which would have had numerous attractive consequences. In particular, it implied that there is no tournament with a partition A, B of its vertex set, such that every transitive subset of A is in the out-neighbour set of some vertex in B, and vice versa. But in fact there is such a tournament, as we show in this article, and so Schwartz’ conjecture is false. Our proof is non-constructive and uses the probabilistic method.
Year
DOI
Venue
2013
10.1007/s00355-011-0638-y
Social Choice and Welfare
Keywords
Field
DocType
Econ Theory, Tournament Solution, Sophisticated Vote, Random Tournament, Transitive Subset
Discrete mathematics,Mathematical economics,Tournament,Combinatorics,Vertex (geometry),Probabilistic method,Counterexample,Partition (number theory),Conjecture,Mathematics,Transitive relation
Journal
Volume
Issue
ISSN
40
3
1432-217X
Citations 
PageRank 
References 
5
0.72
3
Authors
8
Name
Order
Citations
PageRank
Felix Brandt166664.71
Maria Chudnovsky239046.13
Ilhee Kim391.87
Gaku Liu471.23
Sergey Norin54710.86
Alex Scott625140.93
Paul D. Seymour72786314.49
Stéphan Thomassé865166.03