Counting Reciprocal Hyperbolic Elements in Hecke Groups

Fuente: arXiv
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Main Authors: Basmajian, Ara, Marmolejo, Blanca, Valli, Robert Suzzi
Format: Preprint
Published: 2025
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_version_ 1866912398216003584
author Basmajian, Ara
Marmolejo, Blanca
Valli, Robert Suzzi
author_facet Basmajian, Ara
Marmolejo, Blanca
Valli, Robert Suzzi
contents A reciprocal geodesic on a (2,k, $\infty$) Hecke surface is a geodesic loop based at an even order cone point p traversing its path an even number of times. Associated to each reciprocal geodesic is the conjugacy class of a hyperbolic element in the (2,k,$\infty$) Hecke group whose axis passes through a cone point that projects to p. Such an element is called a reciprocal hyperbolic element based at p. In this paper, we determine the asymptotic growth rate and limiting constant (in terms of word length) of the number of primitive conjugacy classes of reciprocal hyperbolic elements in a Hecke group.
format Preprint
id arxiv_https___arxiv_org_abs_2505_21365
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Counting Reciprocal Hyperbolic Elements in Hecke Groups
Basmajian, Ara
Marmolejo, Blanca
Valli, Robert Suzzi
Geometric Topology
Combinatorics
Group Theory
20F69, 32G15, 57K20
A reciprocal geodesic on a (2,k, $\infty$) Hecke surface is a geodesic loop based at an even order cone point p traversing its path an even number of times. Associated to each reciprocal geodesic is the conjugacy class of a hyperbolic element in the (2,k,$\infty$) Hecke group whose axis passes through a cone point that projects to p. Such an element is called a reciprocal hyperbolic element based at p. In this paper, we determine the asymptotic growth rate and limiting constant (in terms of word length) of the number of primitive conjugacy classes of reciprocal hyperbolic elements in a Hecke group.
title Counting Reciprocal Hyperbolic Elements in Hecke Groups
topic Geometric Topology
Combinatorics
Group Theory
20F69, 32G15, 57K20
url https://arxiv.org/abs/2505.21365