On the fixed-point set of automorphisms of non-orientable surfaces without boundary

Details On the fixed-point set of automorphisms of non-orientable surfaces without boundary On the fixed-point set of automorphisms of non-orientable surfaces without boundary

1998-10-27

arxiv.org/abs/math/9810193v1

Geom. Topol. Monogr. 1 (1998), 295-301

Mathematics

Geometric Topology

7 pages. Published copy, also available at http://www.maths.warwick.ac.uk/gt/GTMon1/paper13.abs.html

Scientific paper

Macbeath gave a formula for the number of fixed points for each non-identity element of a cyclic group of automorphisms of a compact Riemann surface in terms of the universal covering transformation group of the cyclic group. We observe that this formula generalizes to determine the fixed-point set of each non-identity element of a cyclic group of automorphisms acting on a closed non-orientable surface with one exception; namely, when this element has order 2. In this case the fixed-point set may have simple closed curves (called ovals) as well as fixed points. In this note we extend Macbeath's results to include the number of ovals and also determine whether they are twisted or not.

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