Geometriae Dedicata

, Volume 191, Issue 1, pp 171–198 | Cite as

Structure of attractors for boundary maps associated to Fuchsian groups

  • Svetlana Katok
  • Ilie UgarcoviciEmail author
Original Paper


We study dynamical properties of generalized Bowen–Series boundary maps associated to cocompact torsion-free Fuchsian groups. These maps are defined on the unit circle (the boundary of the Poincaré disk) by the generators of the group and have a finite set of discontinuities. We study the two forward orbits of each discontinuity point and show that for a family of such maps the cycle property holds: the orbits coincide after finitely many steps. We also show that for an open set of discontinuity points the associated two-dimensional natural extension maps possess global attractors with finite rectangular structure. These two properties belong to the list of “good” reduction algorithms, equivalence or implications between which were suggested by Zagier.


Fuchsian groups Reduction theory Boundary maps Attractor 

Mathematics Subject Classification (2010)




We thank the anonymous referee for several useful comments and suggestions.

The second author was partially supported by the Simons Foundation (Grant No. 281407).


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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  1. 1.Department of MathematicsThe Pennsylvania State UniversityUniversity ParkUSA
  2. 2.Department of Mathematical SciencesDePaul UniversityChicagoUSA

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