September 4th, 2024

A universal triangulation for flat tori (2022)

The paper "A Universal Triangulation for Flat Tori" presents a method for embedding flat tori into Euclidean space, introducing a universal triangulation of 2434 triangles for accurate metric representation.

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A universal triangulation for flat tori (2022)

The paper titled "A Universal Triangulation for Flat Tori" by Francis Lazarus and Florent Tallerie discusses advancements in the field of computational geometry, specifically regarding the isometric embedding of flat tori into Euclidean space. Building on the foundational work of Burago and Zalgaller, the authors adapt a previously non-constructive proof to create piecewise linear (PL) embeddings of flat tori, which are surfaces formed by identifying opposite sides of a Euclidean parallelogram. Their implementation results in embeddings characterized by a large number of vertices, unique to each flat torus. Furthermore, the authors present a universal triangulation consisting of 2434 triangles, which can be linearly embedded to accurately represent the metric of any flat torus. This work not only revises previous constructions to reduce the number of triangles but also contributes to the understanding of geometric topology and metric geometry.

- The paper presents a method for embedding flat tori into Euclidean space.

- It builds on earlier work by Burago and Zalgaller, adapting their proof for practical applications.

- A universal triangulation with 2434 triangles is introduced, allowing for accurate metric representation.

- The authors' approach results in unique embeddings for each flat torus.

- The research contributes to the fields of computational geometry and geometric topology.

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By @coley_moke - 8 months
A result due to Burago and Zalgaller (1960, 1995) states that every orientable polyhedral surface, one that is obtained by gluing Euclidean polygons, has an isometric piecewise linear (PL) embedding into Euclidean space E3. A flat torus, resulting from the identification of the opposite sides of a Euclidean parallelogram, is a simple example of polyhedral surface. In a first part, Lazarus and Tallerie adapt the proof of Burago and Zalgaller, which is partially non-constructive, to produce PL isometric embeddings of flat tori. Their implementation produces embeddings with a huge number of vertices, moreover distinct for every flat torus. In a second part, based on another construction of Zalgaller (2000) and on recent works by Arnoux et al. (2021), they exhibit a universal triangulation with 2434 triangles which can be embedded linearly on each triangle in order to realize the metric of any flat torus.