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  1. Home > Articles & Issues >
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  3. Many neighborly insc ...
Conference paper

Many neighborly inscribed polytopes and Delaunay triangulations

Bernd Gonska (1), Arnau Padrol ORCID (1)
(1) Institut für Mathematik
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Imported on
November 21, 2016
Published on
December 31, 2013
Last modified on
March 31, 2025
Volume
DMTCS Proceedings vol. AT, 26th International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2014)
Proceedings
DOI
10.46298/dmtcs.2389
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https://about.hal.science/hal-authorisation-v1
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Many neighborly inscribed polytopes and Delaunay triangulations

Bernd Gonska (1), Arnau Padrol ORCID (1)
(1) Institut für Mathematik
Abstract
English
We present a very simple explicit technique to generate a large family of point configurations with neighborly Delaunay triangulations. This proves that there are superexponentially many combinatorially distinct neighborly $d$-polytopes with $n$ vertices that admit realizations inscribed on the sphere. These are the first examples of inscribable neighborly polytopes that are not cyclic polytopes, and provide the current best lower bound for the number of combinatorial types of inscribable polytopes (and thus also of Delaunay triangulations). It coincides with the current best lower bound for the number of combinatorial types of polytopes.
French
Nous présentons une technique explicite simple pour générer une large famille de configurations de points dont les triangulations de Delaunay sontneighborly. Cela prouve que le nombre de $d$-polytopes combinatoirement distincts avec $n$ sommets et admettant une réalisation inscrite sur la sphère est surexponentiel. Ce sont les premiers exemples de polytopes inscriptibles neighborly qui ne sont pas des polytopes cycliques et ils donnent la meilleure borne inférieure actuelle pour le nombre de types combinatoires de polytopes inscriptibles (et donc aussi de triangulations de Delaunay). Cette borne coïncide avec la meilleure borne inférieure actuelle pour le nombre de types combinatoires de polytopes.
Keywords
  • [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM]
  • [MATH.MATH-CO]Mathematics [math]/Combinatorics [math.CO]
  • neighborly polytope
  • inscribable polytope
  • Delaunay triangulation
  • number of combinatorial types
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