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On birational morphisms between pencils of Del Pezzo surfaces |
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| Authors: | Vitaly Vologodsky |
| Institution: | Department of Mathematics, University of Georgia, Athens, Georgia 30602 |
| Abstract: | Let |
| Keywords: | |
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and 
be two Del Pezzo fibrations of degrees 
, 
respectively. Assume that 
and 
differ by a flop. Then we prove that 
and give a short list of values of other basic numerical invariants of 
and 
.