"A Group Theoretical Approach to Tilings of Regular Hyperbolic Lattices" by Felipe Jarrín Acosta

Abstract

In this Independent Study, we explore finite tilings of hyperbolic space as defined on a regular lattice. We adapt a group theoretical invariant developed for this type of problems in Z2 by John Conway and Jeffrey Lagarias. For this, we first present the properties of hyperbolic geometry in the Poincaré Disc Model, its groups of isometries, and Fuchsian groups. Following this, we summarize Conway and Lagarias’ argument in Euclidean space along with their characterization of tilings via boundary words derived from F2 . We then translate their constructions to hyperbolic space through the use of the Poincaré Polygon Theorem together with the resulting regular tesselations of hyperbolic space and their respective Fuchsian groups. Finally, we generalize the Conway-Lagarias invariant while also defining our own tiling problem in the hyperbolic lattice generated by 8 hyperbolic octagons.

Advisor

Kelvey, Robert

Department

Mathematics

Disciplines

Algebra | Discrete Mathematics and Combinatorics | Geometry and Topology

Keywords

Hyperbolic geometry, polyomino, tiling, tesselation, boundary word, Fuchsian group, lattice.

Publication Date

2024

Degree Granted

Bachelor of Arts

Document Type

Senior Independent Study Thesis

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© Copyright 2024 Felipe Jarrín Acosta