According to Wikipedia, Aut(P(V)) = PGL(V). Apparently this is proved by using sheaves generated by global sections but I'm not familiar with this notion. I would appreciate it if anyone could provide a reference where this is proved.
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8$\begingroup$ It's in Hartshorne, 7.1.1: books.google.com/… $\endgroup$– Ben Webster ♦Commented Dec 4, 2010 at 1:58
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1$\begingroup$ The question has been closed: a reference was provided in the comments, which was accepted by the OP. $\endgroup$– Pete L. ClarkCommented Dec 4, 2010 at 16:40
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