On crossing-families in planar point sets

被引：2

作者：

Aichholzer, Oswin ^{[1
]}

Kyncl, Jan ^{[2
]}

Scheucher, Manfred ^{[3
]}

Vogtenhuber, Birgit ^{[1
]}

Valtr, Pavel ^{[2
]}

机构：

[1] Graz Univ Technol, Inst Software Technol, Graz, Austria

[2] Charles Univ Prague, Fac Math & Phys, Dept Appl Math, Prague, Czech Republic

[3] Tech Univ Berlin, Inst Math, Berlin, Germany

来源：

COMPUTATIONAL GEOMETRY-THEORY AND APPLICATIONS | 2022年 / 107卷

基金：

奥地利科学基金会;

关键词：

Crossing family; Point set; Order type; Geometric thrackle;

D O I：

10.1016/j.comgeo.2022.101899

中图分类号：

O29 [应用数学];

学科分类号：

070104 ;

摘要：

A k-crossing family in a point set S in general position is a set of k segments spanned by points of S such that all k segments mutually cross. In this short note we present two statements on crossing families which are based on sets of small cardinality: (1) Any set of at least 15 points contains a crossing family of size 4. (2) There are sets of n points which do not contain a crossing family of size larger than 8 inverted right perpendicular pi/4inverted left perpendicular. Both results improve the previously best known bounds. (C) 2022 Elsevier B.V. All rights reserved.

引用

页数：8

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