Let S $S$ be the blow up of P^n $\mathbb{P}^n$ in a point P. $P$. Let h $h$ be the class of the pullback of an hyperplane of P^n $\mathbb{P}^n$ and e $e$ the class of the exceptional divisor. Why is the divisor l=h-e $l=h-e$ nef? Thank you very much!
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Nefness of h-e $h-e$ in the blowup of P^n$\mathbb{P}^n$ |
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Nefness of h-e in the blowup of P^nLet S be the blow up of P^n in a point P. Let h be the class of the pullback of an hyperplane of P^n and e the class of the exceptional divisor. Why is the divisor l=h-e nef? Thank you very much!
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