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Covering Points by Hyperplanes and Related Problems

Authors Zuzana Patáková , Micha Sharir

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Subject Classification

ACM Subject Classification
  • Theory of computation → Computational geometry
Keywords
  • Rich hyperplanes
  • Incidences
  • Covering points by hyperplanes

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Abstract

For a set P of n points in ℝ^d, for any d ≥ 2, a hyperplane h is called k-rich with respect to P if it contains at least k points of P. Answering and generalizing a question asked by Peyman Afshani, we show that if the number of k-rich hyperplanes in ℝ^d, d ≥ 3, is at least Ω(n^d/k^α + n/k), with a sufficiently large constant of proportionality and with d ≤ α < 2d-1, then there exists a (d-2)-flat that contains Ω(k^{(2d-1-α)/(d-1)}) points of P. We also present upper bound constructions that give instances in which the above lower bound is tight. An extension of our analysis yields similar lower bounds for k-rich spheres.

Cite As Get BibTex

Zuzana Patáková and Micha Sharir. Covering Points by Hyperplanes and Related Problems. In 38th International Symposium on Computational Geometry (SoCG 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 224, pp. 57:1-57:7, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022) https://doi.org/10.4230/LIPIcs.SoCG.2022.57

Author Details

Zuzana Patáková
  • Department of Algebra, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
Micha Sharir
  • School of Computer Science, Tel Aviv University, Tel Aviv, Israel

Funding

  • Patáková, Zuzana: Work partially supported by Charles University projects UNCE/SCI/022 and PRIMUS/21/SCI/014.
  • Sharir, Micha: Work partially supported by ISF Grant 260/18.

Acknowledgements

The authors thank Peyman Afshani for sharing his thoughts with us concerning this problem.

References

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