Mapping class group of a non-orientable surface and moduli space of Klein surfaces
[Groupe modulaire d'une surface non-orientable et l'espace des modules des surfaces de Klein]
Comptes Rendus. Mathématique, Tome 335 (2002) no. 12, pp. 1053-1056.

Comme pour les surfaces de Riemann, l'espace des modules des surfaces de Klein fermées, non-orientable et de genre g peut être défini comme l'espace des orbites de l'espace de Teichmüller 𝒯 g sous l'action du groupe modulaire Modg d'une surface fermée, non-orientable. Utilisant l'ensemble de générateurs donné par Birman et Chillingworth nous prouvons que le dernier groupe est engendré par des involutions. On en déduit, utilisant le résultat d'Armstrong, que l'espace des modules est simplement-connexe.

As for Riemann surfaces, the moduli space of closed non-orientable Klein surfaces of genus g can be defined as the orbit space of the Teichmüller space 𝒯 g by the mapping class group Modg of a closed non-orientable surface. Using the set of generators given by Birman and Chillingworth, we prove that the latter group is generated by involutions. We conclude, using the Armstrong's result, that the moduli space is simply-connected.

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DOI : 10.1016/S1631-073X(02)02617-1
Szepietowski, Błażej 1

1 Institute of Mathematics, Gdańsk University, Wita Stwosza 57, 80-952 Gdańsk, Poland
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Szepietowski, Błażej. Mapping class group of a non-orientable surface and moduli space of Klein surfaces. Comptes Rendus. Mathématique, Tome 335 (2002) no. 12, pp. 1053-1056. doi : 10.1016/S1631-073X(02)02617-1. http://www.numdam.org/articles/10.1016/S1631-073X(02)02617-1/

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[2] Armstrong, M.A. The fundamental group of the orbit space of a discontinous group, Proc. Cambridge Philos. Soc., Volume 64 (1968), pp. 299-301

[3] Birman, J.S.; Chillingworth, D.R. On the homeotopy group of a non-orientable surface, Proc. Cambridge Philos. Soc., Volume 71 (1972), pp. 437-448

[4] Lickorish, W.B.R. Homeomorphisms of non-orientable two-manifolds, Proc. Cambridge Philos. Soc., Volume 59 (1963), pp. 307-317

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[6] Maclachlan, C. Modulus space is simply-connected, Proc. Amer. Math. Soc., Volume 29 (1971), pp. 185-186

[7] McCarthy, J.; Papadopoulus, A. Involutions in surface mapping class groups, Enseign. Math., Volume 33 (1987), pp. 275-290

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