Hi fellow mathematicians,

I'm just studying mumfords proof of the existence of a coarse modulispace for curves of genus $g$in his great GIT book. On page 102 (in the proof of proposition 5.2) he talks about two natural homomorphisms $h_1,h_2$. I thinking about this for quite a whole now, but I simply can't see, what exactly these morphisms do on the level of objects. Can those morphisms be written down exactly?

I would be very thankful for any hints & explanations.

Regards from Tuebingen

Wolfgang

`$F=O_{\mathbf{P}^n_S}(1)$`

). – user27056 Nov 8 '12 at 23:04