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Poor ideal three-edge triangulations are minimal
E. A. Fominykhab, E. V. Shumakovaac a St. Petersburg State University, St. Petersburg, Russia
b St. Petersburg Department of the
Steklov Mathematical Institute of the Russian Academy of Sciences,
St. Petersburg, Russia
c Chelyabinsk State University, Chelyabinsk, Russia
Abstract:
An ideal triangulation of a compact 3-manifold with nonempty boundary is known to be minimal if and only if the triangulation contains the minimum number of edges among all ideal triangulations of the manifold. Therefore, every ideal one-edge triangulation (i.e., an ideal singular triangulation with exactly one edge) is minimal. Vesnin, Turaev, and Fominykh showed that an ideal two-edge triangulation is minimal if no 3–2 Pachner move can be applied. In this paper we show that each of the so-called poor ideal three-edge triangulations is minimal. We exploit this property to construct minimal ideal triangulations for an infinite family of hyperbolic 3-manifolds with totally geodesic boundary.
Keywords:
3-manifold, ideal triangulation, triangulation complexity of the 3-manifold, minimal triangulation.
Received: 16.03.2021 Revised: 12.05.2021 Accepted: 11.06.2021
Citation:
E. A. Fominykh, E. V. Shumakova, “Poor ideal three-edge triangulations are minimal”, Sibirsk. Mat. Zh., 62:5 (2021), 1163–1172; Siberian Math. J., 62:5 (2021), 943–950
Linking options:
https://www.mathnet.ru/eng/smj7621 https://www.mathnet.ru/eng/smj/v62/i5/p1163
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