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Results tagged with ramification
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user 16082
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Elementary proof of the Hurwitz formula
So if $f:X \rightarrow Y$ is a non-constant map of degree $n$ between two projective non-singular curves, with genera $g_X$ and $g_Y$, then
$$
2(g_X-1) = 2n(g_Y-1) + \deg(R),
$$
where $R$ is the ramification …
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