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Jan 26, 2011 at 8:45 history edited Francesco Polizzi
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Jan 25, 2011 at 21:48 comment added Francesco Polizzi @Andy: your comment appeared exactly when I finished to type my answer...
Jan 25, 2011 at 21:46 history edited skupers CC BY-SA 2.5
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Jan 25, 2011 at 21:43 vote accept skupers
Jan 25, 2011 at 21:40 answer added Francesco Polizzi timeline score: 13
Jan 25, 2011 at 21:37 comment added Andy Putman @skupers : The answer is ``all of them''. Indeed, any compact Riemann surface has a nonconstant meromorphic map (this follows eg from Riemann Roch, though often it is proven along the way to proving Riemann Roch), and thus is a branched cover of the sphere, and thus can be expressed via your construction. See any book on compact Riemann surfaces for the details (I recommend the books of Forester, Gunning, and Narasimhan).
Jan 25, 2011 at 21:32 history asked skupers CC BY-SA 2.5