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On birational morphisms between pencils of Del Pezzo surfaces
Authors:Vitaly Vologodsky
Institution:Department of Mathematics, University of Georgia, Athens, Georgia 30602
Abstract:

Let $X/S$ and $X'/S'$ be two Del Pezzo fibrations of degrees $d$, $d'$ respectively. Assume that $X$ and $X'$ differ by a flop. Then we prove that $d=d'$ and give a short list of values of other basic numerical invariants of $X$ and $X'$.

Keywords:
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