The Quarterly Journal of Mathematics Advance Access published online on December 12, 2008
The Quarterly Journal of Mathematics, doi:10.1093/qmath/han034
A NOTE ON BELYI'S THEOREM FOR KLEIN SURFACES

School of Mathematics, University of Southampton, Southampton SO17 1BJ, UK
Fakultät für Mathematik, Universität Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany
Corresponding author. E-mail: B.Koeck{at}soton.ac.uk
Received 16 September 2008;
| Abstract |
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Singerman and the first named author have recently developed a real Belyi theory, leaving open a particular case in the proof of Belyi's theorem for Klein surfaces. We answer their question affirmatively by a descent argument which turns out to extend to a much more general context.

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