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A Polynomial Time Algorithm to Compute Geodesics in CAT(0) Cubical Complexes

Author Koyo Hayashi

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Author Details

Koyo Hayashi
  • Department of Mathematical Informatics, University of Tokyo, Tokyo 113-8656, Japan

Funding

The work was supported by JSPS KAKENHI Grant Number 17K00029, and by JST ERATO Grant Number JPMJER1201, Japan.

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Koyo Hayashi. A Polynomial Time Algorithm to Compute Geodesics in CAT(0) Cubical Complexes. In 45th International Colloquium on Automata, Languages, and Programming (ICALP 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 107, pp. 78:1-78:14, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)
https://doi.org/10.4230/LIPIcs.ICALP.2018.78

Abstract

This paper presents the first polynomial time algorithm to compute geodesics in a CAT(0) cubical complex in general dimension. The algorithm is a simple iterative method to update breakpoints of a path joining two points using Miller, Owen and Provan's algorithm (Adv. in Appl. Math, 2015) as a subroutine. Our algorithm is applicable to any CAT(0) space in which geodesics between two close points can be computed, not limited to CAT(0) cubical complexes.

Subject Classification

ACM Subject Classification
  • Theory of computation → Computational geometry
Keywords
  • Geodesic
  • CAT(0) Space
  • Cubical Complex

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