The Torsion Generating Set Of The Extended Mapping Class Groups In Low Genus Cases

Xiaoming Du

Published 2019-01-05Version 1

We prove that for genus $g=3,4$, the extended mapping class group $\text{Mod}^{\pm}(S_g)$ can be generated by two elements of finite orders. But for $g=1$, $\text{Mod}^{\pm}(S_1)$ cannot be generated by two elements of finite orders.