Holes in 2-convex point sets

Oswin Aichholzer, Martin Balko, Thomas Hackl, Alexander Pilz, Pedro Ramos, Pavel Valtr, Birgit Vogtenhuber

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Abstract

Let S be a set of n points in the plane in general position (no three points from S are collinear). For a positive integer k, a k-hole in S is a convex polygon with k vertices from S and no points of S in its interior. For a positive integer l, a simple polygon P is l-convex if no straight line intersects the interior of P in more than l connected components. A point set S is l-convex if there exists an l-convex polygonization of S. Considering a typical Erdős-Szekeres-type problem, we show that every 2-convex point set of size n contains an Ω(log n)-hole. In comparison, it is well known that there exist arbitrarily large point sets in general position with no 7-hole. Further, we show that our bound is tight by constructing 2-convex point sets with holes of size at most O(log n).

Original languageEnglish
Title of host publicationCombinatorial Algorithms - 28th International Workshop, IWOCA 2017, Revised Selected Papers
PublisherSpringer Verlag Heidelberg
Pages169-181
Number of pages13
Volume10765
ISBN (Print)9783319788241
DOIs
Publication statusPublished - 1 Jan 2018
Event28th International Workshop on Combinational Algorithms, IWOCA 2017 - Newcastle, NSW, Australia
Duration: 17 Jul 201721 Jul 2017

Publication series

NameLecture Notes in Computer Science
Volume10765
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference28th International Workshop on Combinational Algorithms, IWOCA 2017
CountryAustralia
CityNewcastle, NSW
Period17/07/1721/07/17

Fingerprint

Point Sets
Convex Sets
Interior
Simple Polygon
Integer
Convex polygon
Collinear
Intersect
Connected Components
Straight Line
Large Set

Keywords

  • 2-convex set
  • Convex position
  • Hole
  • Horton set
  • Point set

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)

Cite this

Aichholzer, O., Balko, M., Hackl, T., Pilz, A., Ramos, P., Valtr, P., & Vogtenhuber, B. (2018). Holes in 2-convex point sets. In Combinatorial Algorithms - 28th International Workshop, IWOCA 2017, Revised Selected Papers (Vol. 10765, pp. 169-181). (Lecture Notes in Computer Science ; Vol. 10765 ). Springer Verlag Heidelberg. https://doi.org/10.1007/978-3-319-78825-8_14

Holes in 2-convex point sets. / Aichholzer, Oswin; Balko, Martin; Hackl, Thomas; Pilz, Alexander; Ramos, Pedro; Valtr, Pavel; Vogtenhuber, Birgit.

Combinatorial Algorithms - 28th International Workshop, IWOCA 2017, Revised Selected Papers. Vol. 10765 Springer Verlag Heidelberg, 2018. p. 169-181 (Lecture Notes in Computer Science ; Vol. 10765 ).

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Aichholzer, O, Balko, M, Hackl, T, Pilz, A, Ramos, P, Valtr, P & Vogtenhuber, B 2018, Holes in 2-convex point sets. in Combinatorial Algorithms - 28th International Workshop, IWOCA 2017, Revised Selected Papers. vol. 10765, Lecture Notes in Computer Science , vol. 10765 , Springer Verlag Heidelberg, pp. 169-181, 28th International Workshop on Combinational Algorithms, IWOCA 2017, Newcastle, NSW, Australia, 17/07/17. https://doi.org/10.1007/978-3-319-78825-8_14
Aichholzer O, Balko M, Hackl T, Pilz A, Ramos P, Valtr P et al. Holes in 2-convex point sets. In Combinatorial Algorithms - 28th International Workshop, IWOCA 2017, Revised Selected Papers. Vol. 10765. Springer Verlag Heidelberg. 2018. p. 169-181. (Lecture Notes in Computer Science ). https://doi.org/10.1007/978-3-319-78825-8_14
Aichholzer, Oswin ; Balko, Martin ; Hackl, Thomas ; Pilz, Alexander ; Ramos, Pedro ; Valtr, Pavel ; Vogtenhuber, Birgit. / Holes in 2-convex point sets. Combinatorial Algorithms - 28th International Workshop, IWOCA 2017, Revised Selected Papers. Vol. 10765 Springer Verlag Heidelberg, 2018. pp. 169-181 (Lecture Notes in Computer Science ).
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