The most efficient origami torus.

Schwartz, Richard Evan · Proc Natl Acad Sci U S A · 2026

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Abstract

A paper torus, also called an origami torus, is a torus in three-dimensional space that is made from finitely many triangles which fit together in such a way that the sum of the angles around each vertex is 2<i>π</i>. This article announces the result that there does not exist an origami torus with 7 vertices and there does exist an origami torus with 8 vertices. These results settle the question about the most efficient way, in terms of the number of vertices, to construct an origami torus.