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Reduction theory for Fuchsian groups with cusps

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arxiv 2507.16958 v4 pith:ESA2QN23 submitted 2025-07-22 math.DS

Reduction theory for Fuchsian groups with cusps

classification math.DS
keywords groupboundaryfuchsianmapsreductionstructureassociatedattractor
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We study a family of Bowen-Series-like maps associated to any finitely generated Fuchsian group of the first kind with at least one cusp. These maps act on the boundary of the hyperbolic plane in a piecewise manner by generators of the group. We show that the two-dimensional natural extension (reduction map) of the boundary map has a domain of bijectivity and global attractor with a finite rectangular structure, confirming a conjecture of Don Zagier. Our work is based on the construction of a special fundamental polygon, related to the free product structure of the group, whose marking is preserved by "Teichm\"uller deformation."

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    Algebraic correspondences mate rational maps with Kleinian groups, and the modular Mandelbrot set is homeomorphic to the Mandelbrot set—this survey reports those results.