Erd\H{o}s - Szekeres Theorem for Lines
Metric Geometry
2015-04-20 v2 Combinatorics
Abstract
According to the Erd\H{o}s-Szekeres theorem, for every , a sufficiently large set of points in general position in the plane contains in convex position. In this note we investigate the line version of this result, that is, we want to find lines in convex position in a sufficiently large set of lines that are in general position. We prove almost matching upper and lower bounds for the minimum size of the set of lines in general position that always contains in convex position. This is quite unexpected, since in the case of points, the best known bounds are very far from each other. We also establish the dual versions of many variants and generalizations of the Erd\H os-Szekeres theorem.
Cite
@article{arxiv.1307.5666,
title = {Erd\H{o}s - Szekeres Theorem for Lines},
author = {Imre Bárány and Edgardo Roldán-Pensado and Géza Tóth},
journal= {arXiv preprint arXiv:1307.5666},
year = {2015}
}