Crosscap slides and the level 2 mapping class group of a nonorientable surface
Crosscap slides and the level 2 mapping class group of a nonorientable surface
Crosscap slide is a homeomorphism of a nonorientable surface of genus at least 2, which was introduced under the name Y-homeomorphism by Lickorish as an example of an element of the mapping class group which cannot be expressed as a product of Dehn twists. We prove that the subgroup of …