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arxiv: 1109.4382 · v3 · pith:DKJG6A5Snew · submitted 2011-09-20 · 🧮 math.AG

Numerical triviality and pullbacks

classification 🧮 math.AG
keywords divisorcomplexconnectedequivalentf-numericallyfibersmorphismnumerical
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Let f: X \to Z be a surjective morphism of smooth complex projective varieties with connected fibers. Suppose that L is a pseudo-effective divisor on X that is f-numerically trivial. We show that there is a divisor D on Z such that L is numerically equivalent to f^*D.

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