## Abstract

In this paper, we consider variants of the Geometric Subset General Position problem. In defining this problem, a geometric subsystem is specified, like a subsystem of lines, hyperplanes or spheres. The input of the problem is a set of n points in Rd and a positive integer k. The objective is to find a subset of at least k input points such that this subset is in general position with respect to the specified subsystem. For example, a set of points is in general position with respect to a subsystem of hyperplanes in Rd if no d + 1 points lie on the same hyperplane. In this paper, we study the Hyperplane Subset General Position problem under two parameterizations. When parameterized by k then we exhibit a polynomial kernelization for the problem. When parameterized by h = n - k, or the dual parameter, then we exhibit polynomial kernels which are also tight, under standard complexity theoretic assumptions. We can also exhibit similar kernelization results for d-Polynomial Subset General Position, where a vector space of polynomials of degree at most d are specified as the underlying subsystem such that the size of the basis for this vector space is b. The objective is to find a set of at least k input points, or in the dual delete at most h = n-k points, such that no b+1 points lie on the same polynomial. Notice that this is a generalization of many well-studied geometric variants of the Set Cover problem, such as Circle Subset General Position. We also study general projective variants of these problems. These problems are also related to other geometric problems like Subset Delaunay Triangulation problem.

Original language | English |
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Title of host publication | 42nd International Symposium on Mathematical Foundations of Computer Science, MFCS 2017 |

Editors | Kim G. Larsen, Hans L. Bodlaender, Jean-Francois Raskin |

Place of Publication | Dagstuhl |

Publisher | Schloss Dagstuhl - Leibniz-Zentrum für Informatik |

ISBN (Electronic) | 978-3-95977-046-0 |

DOIs | |

Publication status | Published - 1 Nov 2017 |

Event | 42nd International Symposium on Mathematical Foundations of Computer Science (MFCS 2017) - Aalborg, Denmark Duration: 21 Aug 2017 → 25 Aug 2017 Conference number: 42 http://mfcs2017.cs.aau.dk/ |

### Publication series

Name | Leibniz International Proceedings in Informatics (LIPIcs) |
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Volume | 83 |

### Conference

Conference | 42nd International Symposium on Mathematical Foundations of Computer Science (MFCS 2017) |
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Abbreviated title | MFCS 2017 |

Country/Territory | Denmark |

City | Aalborg |

Period | 21/08/17 → 25/08/17 |

Internet address |

## Keywords

- Bounded degree polynomials
- Hyperplanes
- Incidence Geometry
- Kernel Lower bounds