Classification of smooth Mori fibrations birational to the double cone variety

Let UU be the Fano variety of index 22 and degree 55 described in the surrounding text, and let VlUV_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.

Sources & referencesView supporting material

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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