Abstract
The degree \( d(x) \) of a vertex or face \( x \) in a graph \( G \) on the plane or other orientable surface is the number of incident edges. A face \( f=v_{1}\ldots v_{d(f)} \) is of type \( (k_{1},k_{2},\dots) \) if \( d(v_{i})\leq k_{i} \) whenever \( 1\leq i\leq d(f) \). We denote the minimum vertex-degree of \( G \) by \( \delta \). The purpose of our paper is to prove that every triangulation with \( \delta\geq 4 \) of the torus, as well as of large enough such a triangulation of any fixed orientable surface of higher genus has a face of one of the types \( (4,4,\infty) \), \( (4,6,12) \), \( (4,8,8) \), \( (5,5,8) \), \( (5,6,7) \), or \( (6,6,6) \), where all parameters are best possible.
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Funding
Borodin was supported by the Ministry of Science and Higher Education of the Russian Federation (Grant FWNF–2022–0017). Ivanova was supported by the Ministry of Science and Higher Education of the Russian Federation (Grant FSRG–2020–0006).
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Translated from Sibirskii Matematicheskii Zhurnal, 2022, Vol. 63, No. 4, pp. 796–804. https://doi.org/10.33048/smzh.2022.63.406
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Borodin, O.V., Ivanova, A.O. Combinatorial Structure of Faces in Triangulations on Surfaces. Sib Math J 63, 662–669 (2022). https://doi.org/10.1134/S0037446622040061
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DOI: https://doi.org/10.1134/S0037446622040061