Classification of smooth Mori fibrations birational to the double cone variety

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Let UU be the Fano variety of index 22 and degree 55 described in the surrounding text, and let Vl→UV_l\to U be the contraction associated with a curve ll on UU. A smooth Mori fibration is a Mori fibration whose total space is smooth; two varieties are in the same class of birational equivalency when they are birational.

Classification conjecture. Any smooth Mori fibration birational to UU is biregular to either UU or VlV_l for some curve ll.

The conjecture is motivated by the failure of the maximal singularities method to handle all cases, including when ll has a double point. The supplied text gives no resolution status.

References

Primary source

Mikhail Grinenko, “Birational properties of pencils of del Pezzo surfaces of degree 1 and 2”, arXiv:math/0002252 (2000).

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