From discrete to dense: explorations in the moduli space of triangles

Fuente: arXiv
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Auteurs principaux: Aggarwal, Aahana, Gupta, Subhojoy, Nair, Ajay K.
Format: Preprint
Publié: 2026
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author Aggarwal, Aahana
Gupta, Subhojoy
Nair, Ajay K.
author_facet Aggarwal, Aahana
Gupta, Subhojoy
Nair, Ajay K.
contents The moduli space of triangles is a two-dimensional space that records triangle shapes in the plane, considered up to similarity. We study the subset corresponding to \textit{lattice triangles}, which are triangles whose vertices have integer coordinates. We prove that this subset is \textit{dense}, that is, every triangle shape can be approximated arbitrarily well by lattice triangles. However, when one restricts to lattice triangles in the square $[-N,N]^2$, their shapes do \textit{not} become uniformly distributed in the moduli space as $N$ grows. Along the way, we encounter connections with geometry, number theory, analysis, and probability.
format Preprint
id arxiv_https___arxiv_org_abs_2604_00373
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle From discrete to dense: explorations in the moduli space of triangles
Aggarwal, Aahana
Gupta, Subhojoy
Nair, Ajay K.
Metric Geometry
Probability
51M04, 60D05, 28A33
The moduli space of triangles is a two-dimensional space that records triangle shapes in the plane, considered up to similarity. We study the subset corresponding to \textit{lattice triangles}, which are triangles whose vertices have integer coordinates. We prove that this subset is \textit{dense}, that is, every triangle shape can be approximated arbitrarily well by lattice triangles. However, when one restricts to lattice triangles in the square $[-N,N]^2$, their shapes do \textit{not} become uniformly distributed in the moduli space as $N$ grows. Along the way, we encounter connections with geometry, number theory, analysis, and probability.
title From discrete to dense: explorations in the moduli space of triangles
topic Metric Geometry
Probability
51M04, 60D05, 28A33
url https://arxiv.org/abs/2604.00373