Geodesic
Abelian subgroups generated by Dehn twists in homeomorphism group
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2013), pp. 26-32 
D. A. Permyakov. Abelian subgroups generated by Dehn twists in homeomorphism group. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2013), pp. 26-32. http://geodesic.mathdoc.fr/item/VMUMM_2013_1_a4/
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     title = {Abelian subgroups generated by {Dehn} twists in homeomorphism group},
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Voir la notice de l'article provenant de la source Math-Net.Ru

The subgroup of mapping class group generated by Dehn twists along the set of simple closed pairwise nonhomotopic curves with some conditions is studied. It is proved that this group is isomorphic to a free Abelian group of rank $k$, where $k$ is the number of curves in the set. In the case of an oriented surface, this result is classic.

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