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Maximum matchings in geometric intersection graphs [Elektronski vir]Bonnet, Édouard ; Cabello, Sergio ; Mulzer, WolfgangLet ▫$G$▫ be an intersection graph of ▫$n$▫ geometric objects in the plane. We show that a maximum matching in ▫$G$▫ can be found in ▫$O(\rho^{3\omega/2}n^{\omega/2})$▫ time with high probability, ... where ▫$\rho$▫ is the density of the geometric objects and ▫$\omega>2$▫ is a constant such that ▫$n \times n$▫ matrices can be multiplied in ▫$O(n^\omega)$▫ time. The same result holds for any subgraph of ▫$G$▫, as long as a geometric representation is at hand. For this, we combine algebraic methods, namely computing the rank of a matrix via Gaussian elimination, with the fact that geometric intersection graphs have small separators. We also show that in many interesting cases, the maximum matching problem in a general geometric intersection graph can be reduced to the case of bounded density. In particular, a maximum matching in the intersection graph of any family of translates of a convex object in the plane can be found in ▫$O(n^{\omega/2})$▫ time with high probability, and a maximum matching in the intersection graph of a family of planar disks with radii in ▫$[1, \Psi]$▫ can be found in ▫$O(\Psi^6\log^{11} n + \Psi^{12 \omega} n^{\omega/2})$▫ time with high probability.Source: 37th Symposium on Theoretical Aspects of Computer Science [Elektronski vir] : STACS 2020, March 10-13, 2020, Montpellier, France (1 spletni vir (1 datoteka PDF (17 str.)))Type of material - conference contributionPublish date - 2020Language - englishCOBISS.SI-ID - 12836611
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Bonnet, Édouard | ![]() |
Cabello, Sergio | 25993 |
Mulzer, Wolfgang | ![]() |
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