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Nov 15, 2010 at 4:05 vote accept schur
Oct 21, 2010 at 9:23 comment added Idoneal "This sounds tricky. Maybe Serre even conjectured once that this never happened if $p$ was sufficiently large. Let's say he did. Are you going to contradict Serre?" - I liked your style of persuasion.
Oct 21, 2010 at 6:44 comment added Kevin Buzzard This is a nice answer. I think the bottom line is that the main thing it indicates is that the question needs to be made precise in an even stronger way. One needs to assume that $\alpha$ is a totally real algebraic integer such that every conjugate has absolute value strictly less than $2\sqrt{p}$. I don't think $\alpha=0$ is a problem because one can use forms of level $p^2$ to get this. I don't buy the Shimura curves argument because, even though one Shimura curve is unlikely to contain a point, we're allowed to change level so we have infinitely many to play with.
Oct 21, 2010 at 6:11 history answered user631 CC BY-SA 2.5