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Let $G$ be a group of automorphisms acting on a curve $X/\C$ of genus at least $2$, let $g_0$ be the genus of the quotient $Y:=X/G$, let $B$ be the set of branch points of the projection $\phi\colon X\to Y$, and let $m_1 \leq m_2 \leq \ldots \leq m_r$ be the orders of the standard generators for $\pi_1(Y-B,y_0)$ corresponding to the elements of $B=\{y_1,\ldots,y_r\}$.

The sequence of integers $[g_0; m_1, \ldots, m_r]$ is the signature of the group action.

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  • Review status: reviewed
  • Last edited by Andrew Sutherland on 2018-06-29 20:50:17
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