A classification of pseudo-Anosov homeomorphisms I: the geometric type is a complete conjugacy invariant

2025/11/24 by Inti Cruz Diaz, Diaz, Inti Cruz · 1 citation
Mathematics · Computer Science · #Mathematical Dynamics and Fractals #Computability, Logic, AI Algorithms #Advanced Topology and Set Theory

paper · pdf · doi:10.48550/arxiv.2511.19774

Abstract

Every pseudo-Anosov homeomorphism f admits infinitely many Markov partitions. A geometric Markov partition is a Markov partition R in which each rectangle is equipped with a vertical orientation. To each pair (f, R), consisting of a pseudo-Anosov homeomorphism f and a geometric Markov partition R, there is a naturally associated combinatorial object called its geometric type T(f, R). We prove, using symbolic dynamics, that two pseudo-Anosov homeomorphisms are topologically conjugate via an orientation-preserving homeomorphism if and only if they admit geometric Markov partitions with the same geometric type. This result lays the groundwork for the algorithmic classification we will develop in subsequent work.

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• Primitive Geometric Markov Partitions for pseudo-Anosov Homeomorphisms

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