Automorphisms in Birational and Affine Geometry: Levico by Ivan Cheltsov, Ciro Ciliberto, Hubert Flenner, James

By Ivan Cheltsov, Ciro Ciliberto, Hubert Flenner, James McKernan, Yuri G. Prokhorov, Mikhail Zaidenberg

The major concentration of this quantity is at the challenge of describing the automorphism teams of affine and projective types, a classical topic in algebraic geometry the place, in either circumstances, the automorphism staff is frequently limitless dimensional. the gathering covers a variety of subject matters and is meant for researchers within the fields of classical algebraic geometry and birational geometry (Cremona teams) in addition to affine geometry with an emphasis on algebraic workforce activities and automorphism teams. It provides unique learn and surveys and offers a worthy review of the present cutting-edge in those topics.

Bringing jointly experts from projective, birational algebraic geometry and affine and complicated algebraic geometry, together with Mori conception and algebraic crew activities, this publication is the results of resulting talks and discussions from the convention “Groups of Automorphisms in Birational and Affine Geometry” held in October 2012, on the CIRM, Levico Terme, Italy. The talks on the convention highlighted the shut connections among the above-mentioned parts and promoted the alternate of data and strategies from adjoining fields.

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16 below). 15. Any Mori fibration W X ! 12. 13 and where ˛ and ˇ are isomorphisms of fibrations. Proof. 13. This is an easy caseby-case study; here are the steps. Starting from a Mori fibration W X ! W where W is a point, the only links we can perform are links of type I or II centered at a real point or two conjugate non-real points. X /, so the choice of the point is not relevant. Blowing-up a real point in P2 or two non-real points in Q3;1 gives rise to a link of type I to F1 or D6 . The remaining cases correspond to the stereographic projection Q3;1 Ü P2 and its converse.

We denote by N the maximum of the integers ni . If N Ä 1, we are done because all links of type II between Fj and Fj 0 with j; j 0 Ä 1 are standard. We can thus assume N 2, which implies that there exists i such that ni D N , ni 1 < N; ni C1 Ä N . qi /. For j 2 fi 1; i; i C 1g, we denote by j W Fnj Ü Fn0j a Sarkisov link centered at qj ; qj . We obtain then the following commutative diagram Fn i ✤ ✤ ✤  Fn0i 'i 1 i 1 1 'i ❴ ❴ ❴G Fn ❴ ❴ ❴G Fn i i C1 ✤ ✤ ✤ i ✤ i C1 1 ✤ ✤   'i0 1 'i0 ❴ ❴ ❴ G Fn 0 ❴ ❴ ❴ G Fn 0 ; i i C1 where 'i0 1 ; 'i0 are Sarkisov links.

R// of degree 5. R// is indeed generated by projectivities and standard quintic transformations. 1. Let 'W Q3;1 Ü Q3;1 be a birational map that decomposes as ' D '3 '2 '1 , where 'i W Xi 1 Ü Xi is a Sarkisov link for each i , where X0 D Q3;1 D X2 , X1 D D6 . If '2 has a real base-point, then ' can be written as ' D 2 1 , where 1 ; . 2 / 1 are links of type II from Q3;1 to P2 . Proof. '1 / 1 ; '3 is the blow-up of two conjugate non-real points. '1 / 1 '  '3 Q3;1 ❴ ❴ ❴ ❴ ❴ ❴ ❴ ❴G Q3;1 : The map ' has thus exactly three base-points, two of them being non-real and one being real; we denote them by p1 ; pN1 , q.

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