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Counting triangulations of fixed cardinal degrees
University of Notre Dame, United States.ORCID iD: 0000-0001-8333-3676
TU Eindhoven, Netherlands.ORCID iD: 0000-0002-9570-024X
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Algebra, Combinatorics and Topology.ORCID iD: 0000-0003-2546-5333
VU Amsterdam, Netherlands.ORCID iD: 0009-0001-3084-4314
2026 (English)In: Journal of Computational Geometry, E-ISSN 1920-180X, Vol. 17, no 1, p. 138-163Article in journal (Refereed) Published
Abstract [en]

A fixed set of vertices in the plane may have multiple planar straight-line triangulations in which the degree of each vertex is the same. As such, the degree information does not completely determine the triangulation. We show that even if we know, for each vertex, the number of neighbors in each of the four cardinal directions, the triangulation is not completely determined. In fact, we show that counting such triangulations is #P-hard via a reduction from #3-regular bipartite planar vertex cover.

Place, publisher, year, edition, pages
Carleton University , 2026. Vol. 17, no 1, p. 138-163
National Category
Discrete Mathematics Computer Sciences
Identifiers
URN: urn:nbn:se:kth:diva-384618DOI: 10.20382/jocg.v17i1a6ISI: 001786346200005Scopus ID: 2-s2.0-105042343802OAI: oai:DiVA.org:kth-384618DiVA, id: diva2:2083490
Note

QC 20260702

Available from: 2026-07-02 Created: 2026-07-02 Last updated: 2026-07-02Bibliographically approved

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Schenfisch, Anna

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