English

Tree-like resolution complexity of two planar problems

Computational Complexity 2014-12-04 v1

Abstract

We consider two CSP problems: the first CSP encodes 2D Sperner's lemma for the standard triangulation of the right triangle on n2n^2 small triangles; the second CSP encodes the fact that it is impossible to match cells of n×nn \times n square to arrows (two horizontal, two vertical and four diagonal) such that arrows in two cells with a common edge differ by at most 4545^\circ, 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 2Θ(n)2^{\Theta(n)}. For Sperner's lemma our result implies Ω(n)\Omega(n) 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 PPAD\rm PPAD-complete problem. We show that CSP corresponding to arrows is also related with a PPAD\rm PPAD-complete problem.

Keywords

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}
}
R2 v1 2026-06-22T07:18:35.842Z