Let $f:X \to Y$ a morphism between schemes and $\mathcal{L}$ an ample sheaf on $Y$.
Why the pullback $f^*\mathcal{L}$ is also ample?
Let $f:X \to Y$ a morphism between schemes and $\mathcal{L}$ an ample sheaf on $Y$.
Why the pullback $f^*\mathcal{L}$ is also ample?
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