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Francesco Polizzi
Francesco Polizzi
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Nefness of h$h-ee$ in the blowup of P^n$\mathbb{P}^n$

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!

Nefness of h-e in the blowup of P^n

Let 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!

Nefness of $h-e$ in the blowup of $\mathbb{P}^n$

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

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Fulvio
Fulvio
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Nefness of h-e in the blowup of P^n

Let 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!