Tree-like resolution complexity of two planar problems
Abstract
We consider two CSP problems: the first CSP encodes 2D Sperner's lemma for the standard triangulation of the right triangle on small triangles; the second CSP encodes the fact that it is impossible to match cells of square to arrows (two horizontal, two vertical and four diagonal) such that arrows in two cells with a common edge differ by at most , and all arrows on the boundary of the square do not look outside (this fact is a corollary of the Brower's fixed point theorem). We prove that the tree-like resolution complexities of these CSPs are . For Sperner's lemma our result implies lower bound on the number of request to colors of vertices that is enough to make in order to find a trichromatic triangle; this lower bound was originally proved by Crescenzi and Silvestri. CSP based on Sperner's lemma is related with the -complete problem. We show that CSP corresponding to arrows is also related with a -complete problem.
Cite
@article{arxiv.1412.1124,
title = {Tree-like resolution complexity of two planar problems},
author = {Dmitry Itsykson and Anna Malova and Vsevolod Oparin and Dmitry Sokolov},
journal= {arXiv preprint arXiv:1412.1124},
year = {2014}
}