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I'm currently trying to familiarize myself with reducible Jacobians of hyperelliptic curves. A construction which I recently saw in a paper was the quotient $C/\tau$ of a curve $C$ of genus $2$ by a non-hyperelliptic involution $\tau$.

I can get the general idea, but the details of the construction and the following proofs escape me. Almost all of the literature seems to assume a familiarity with properties of such involutions and quotients, but they don't show up at all in the books I read on elliptic curves, abelian varieties and functions fields (there is, as far as I know, very few explicit introductory literature on hyperelliptic curves).

Can someone recommend a good review or some book source which devotes not only two lines to involutions of curves? The genus does not have to be $2$, in fact a more general exposition would be preferable.

Thank you in advance, I would appreciate any guidance and hints.

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up vote 2 down vote accepted

This book, this book, and these notes contain some exposition on hyperelliptic involutions.

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Thank you very much, that should get me started! Putting those three references together will probably enable me to read papers and work the rest out myself. –  Gregor Bruns Jun 23 '12 at 13:05

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