Maximum orders of cyclic and abelian extendable actions on surfaces
Tom 154 / 2018
Colloquium Mathematicum 154 (2018), 183-204
MSC: Primary 57M60, 57S17, 57S25.
DOI: 10.4064/cm7077-11-2017
Opublikowany online: 24 August 2018
Streszczenie
A faithful action of a group $G$ on the genus $g \gt 1$ orientable closed surface $\varSigma _g$ is extendable (over the three-dimensional sphere $S^3$), with respect to an embedding $e: \varSigma _g \hookrightarrow S^3$, if there is an action of $G$ on $S^3$ such that $h\circ e=e\circ h$ for any $h \in G$. We show that the maximum order of extendable cyclic group actions on $\varSigma _g$ is $4g+4$ when $g$ is even, and $4g-4$ when $g$ is odd; the maximum order of extendable abelian group actions on $\varSigma _g$ is $4g+4$. We also give the maximum orders of cyclic and abelian group actions on handlebodies.
