Prime Order Automorphisms of Riemann Surfaces

Details Prime Order Automorphisms of Riemann Surfaces Prime Order Automorphisms of Riemann Surfaces

2007-01-10

arxiv.org/abs/math/0701286v1

Mathematics

Geometric Topology

21 pages

Scientific paper

Recently there has been renewed interest in the mapping-class group of a compact surface of genus $g \ge 2$ and also in its finite order elements. A finite order element of the mapping-class group will be a conformal automorphisms on some Riemann surface of genus $g$. Here we give the details of the proof that there is an {\sl adapted basis} for any conformal automorphism of prime order on a surface of genus $g$ and extend the original result to apply to fixed point free automorphisms. An adapted basis is one that reflects the action of the automorphism in the optimal manner described below. The proof uses the Schreier-Reidemeister rewriting process. We find some new consequences of the existence of an adapted basis. We also construct an explicit example of such a basis and compute its intersection matrix.

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