Computational Geometry ( IF 0.4 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.comgeo.2020.101625 Thao Do
Erdős-Beck's theorem states that n points in the plane with at most points collinear define at least cxn lines for some positive constant c. It implies n points in the plane define lines unless most of the points (i.e. points) are collinear.
In this paper, we will present two ways to extend this result to higher dimensions. Given a set S of n points in , we want to estimate a lower bound of the number of hyperplanes they define (a hyperplane is defined or spanned by S if it contains points of S in general position). Our first result says the number of spanned hyperplanes is at least if there exists some hyperplane that contains points of S and is saturated (as defined in Definition 1.3). Our second result says n points in define hyperplanes unless most of the points belong to the union of a collection of flats whose dimension sum to less than d.
Our result has an application to point-hyperplane incidences and a potential application to the point covering problem.
中文翻译:
将Erdős–Beck定理扩展到更高的维度
埃尔德斯-贝克定理指出,平面上n个点最多共线的点至少为某个正常数c定义cxn条线。这意味着平面中的n个点定义 线,除非大多数要点(即 点)是共线的。
在本文中,我们将提出两种方法将此结果扩展到更高的维度。给定S的n点中,我们要估计的下限它们限定超平面的数目(一个超平面由下式定义或跨区的小号如果它包含的点小号一般位置)。我们的第一个结果说,跨接超平面的数量至少为 如果存在一些包含 S点和S点饱和(定义1.3中定义)。我们的第二个结果说ñ在点 定义 除非大多数点都属于平面集合的并集,这些集合的总和小于d。
我们的结果适用于点超平面入射,并且可能适用于点覆盖问题。