The Komlos Conjecture Holds for Vector Colorings
Abstract
The Komlos conjecture in discrepancy theory states that for some constant K and for any m by n matrix A whose columns lie in the unit ball there exists a +/- 1 vector x such that the infinity norm of Ax is bounded above by K. This conjecture also implies the Beck-Fiala conjecture on the discrepancy of bounded degree hypergraphs. Here we prove a natural relaxation of the Komlos conjecture: if the columns of A are assigned unit real vectors rather than +/- 1 then the Komlos conjecture holds with K=1. Our result rules out the possibility of a counterexample to the conjecture based on semidefinite programming. It also opens the way to proving tighter efficient (polynomial-time computable) upper bounds for the conjecture using semidefinite programming techniques.
Cite
@article{arxiv.1301.4039,
title = {The Komlos Conjecture Holds for Vector Colorings},
author = {Aleksandar Nikolov},
journal= {arXiv preprint arXiv:1301.4039},
year = {2013}
}