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arXiv · 2509.18668

Vertex-minimal hyperbolic origami 2-torus

Zhengyu Zou
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Abstract

We show that there exists a geodesic triangulation $T$ of a hyperbolic genus 2 surface $\Sigma_2$ with 10 vertices and an isometric polyhedral embedding $S: \Sigma_2 \hookrightarrow \mathbb{H}^3$ that sends the triangles in $T$ to geodesic triangles in $\mathbb{H}^3$. We call this type of embedding a hyperbolic origami 2-torus. Since 10 is the combinatorially minimum number of vertices required to triangulate a genus 2 surface, this paper settles the question of minimum number of vertices required to obtain a hyperbolic origami 2-torus.

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Zhengyu Zou. 2025-09-23. Vertex-minimal hyperbolic origami 2-torus. https://arxiv.org/abs/2509.18668

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