Algebraic & Geometric Topology

Bounds for fixed points and fixed subgroups on surfaces and graphs

Abstract

We consider selfmaps of hyperbolic surfaces and graphs, and give some bounds involving the rank and the index of fixed point classes. One consequence is a rank bound for fixed subgroups of surface group endomorphisms, similar to the Bestvina–Handel bound (originally known as the Scott conjecture) for free group automorphisms.

When the selfmap is homotopic to a homeomorphism, we rely on Thurston’s classification of surface automorphisms. When the surface has boundary, we work with its spine, and Bestvina–Handel’s theory of train track maps on graphs plays an essential role.

It turns out that the control of empty fixed point classes (for surface automorphisms) presents a special challenge. For this purpose, an alternative definition of fixed point class is introduced, which avoids covering spaces hence is more convenient for geometric discussions.

Article information

Source
Algebr. Geom. Topol., Volume 11, Number 4 (2011), 2297-2318.

Dates
Revised: 16 February 2011
Accepted: 21 February 2011
First available in Project Euclid: 19 December 2017

https://projecteuclid.org/euclid.agt/1513715270

Digital Object Identifier
doi:10.2140/agt.2011.11.2297

Mathematical Reviews number (MathSciNet)
MR2826940

Zentralblatt MATH identifier
1232.55006

Citation

Jiang, Boju; Wang, Shida; Zhang, Qiang. Bounds for fixed points and fixed subgroups on surfaces and graphs. Algebr. Geom. Topol. 11 (2011), no. 4, 2297--2318. doi:10.2140/agt.2011.11.2297. https://projecteuclid.org/euclid.agt/1513715270

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