Abstract

We show that the normal closure of any periodic element of the mapping class group of a nonorientable surface whose order is greater than 2 contains the commutator subgroup , which for g ≥ 7 is equal to the twist subgroup, and provide necessary and sufficient conditions for the normal closures of involutions to contain the twist subgroup. Finally, we provide a criterion for a periodic element to normally generate M ( N g ) and give examples.

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