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Wajnryb proved that the mapping class group of an orientable surface isgenerated by two elements. We prove that one of these generators can be takenas a Dehn twist. We also prove that the extended mapping class group isgenerated by two elements, again one of which is a Dehn twist. Another resultwe prove is that the mapping class groups are also generated by two elements offinite order.

Generating the surface mapping class group by two elements