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Jul 4, 2010 at 12:07 comment added user6960 Can we also argue inductively using the diagram Unknown control sequence $\mathbf{P}^n \leftarrow \mathrm{Bl}_x{\mathbf{P}^n} \to \mathbf{P}^{n-1}$?
Jul 4, 2010 at 11:59 vote accept user6960
Jul 4, 2010 at 11:00 history answered Boyarsky CC BY-SA 2.5