By Spencer Bloch, Igor V. Dolgachev, William Fulton

ISBN-10: 3540544569

ISBN-13: 9783540544562

Contents: V.A. Alexeev: Theorems approximately sturdy divisors on log Fano kinds (case of index r >n - 2).- D. Arapura: Fano maps and primary groups.- A. Bertram, L. Ein, R. Lazarsfeld: Surjectivity of Gaussian maps for line bundles of enormous measure on curves.- V.I. Danilov: De Rham complicated on toroidal variety.- I. Dolgachev, I. Reider: On rank 2 vector bundles with c21 = 10 and c2 = three on Enriques surfaces.- V.A.Iskovskih: in the direction of the matter of rationality of conic bundles.- M.M. Kapranov: On DG-modules over the De Rham complicated and the vanishing cycles functor.- G. Kempf: extra on computing invariants.- G. Kempf: potent equipment in invariant theory.- V.A. Kolyvagin: at the constitution of the Shafarevich-Tate groups.- Vic.S. Kulikov: at the primary team of the supplement of a hypersurface in Cn.- B. Moishezon, M. Teicher: Braid crew strategy in complicated geometry, II: from preparations of traces and conics to cuspidal curves.- D.Yu. Nogin: Notes on unheard of vector bundles and helices.- M. Saito: Hodge conjecture and combined causes II.- C. Seeley, S. Yau: Algebraic tools within the research of simple-elliptic singularities.- R. Smith, R. Varley: Singularity thought utilized to ***- divisors.- A.N. Tyurin: A mild generalization of the concept of Mehta- Ramanathan.- F.L. Zak: a few houses of twin types and their functions in projective geometry.- Yu.G. Zarhin: Linear irreducible Lie algebras and Hodge buildings.

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Additional resources for Algebraic Geometry: Proceedings of the US-USSR Symposium held in Chicago, June 20–July 14, 1989

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F a n o polarizations o f E n r i q u e s surfaces. F _>3 for every nef divisor F with F 2 = 0. Proposition 1. Every Enriques surface S adndts a Fano polarizationA. The complete linear ,system [A[ defines a birational map S ~ IPs whose image is a surface with at most double rationalpoints as its singularities. PROOF. This is proven in [CD1] under the assumption that char(k) -- 0. 7 i n [ C D l ] . f _>3 for all vectors f with f2 = 0. 1 from toc. cit. we find a nef divisor A with Az = 10 and Aof _>3 for all f with f2 >_3.

Kantor, 1901). Each two-diraensional family (a congruence) o f rational curves in IP 3 such that a general point o f IP 3 is contained in only one curve o f the family can be transformed by a birational automorphism oflP 3 into a congruence of conics (or lines passing through one point). V. Shokurov in the case when S = IP 2 or S is a geometrically ruled surfacelF n (see [5]). Moreover, V. V. Shokurov suggested that conditions (i) and (ii) in Conjecture 1 can be replaced by the following ones: (i') the divisor C+2K s is not effective, where KS is the canonical divisor;, (ii') if rc V ~ S is birationaUy equivalent to no: V o --~ IP2 as in (ii), then condition (i') is satisfied and, moreover, the intermediate Jacobian J(V) of Clemens-Griffiths is isomorphic to the Jacobian o f a curve o f genus 5.

We will assume that there exists an ample A. Then S can he embedded by IAI into IP 5. A is said to be a Reye polarization if the image of S ties on a quadric. A is a said to be a Cavley polarization it" A+KS isa Reye polarization. e. contains smooth rational curves (nodalcurves). Note that every Enriques surface lying on a quadric is isomorphic to a Reye congruence o f lines inlP -~(char(k) ~ 2). The Cayley polarization maps S onto a surface in IP 5 isomorphic to the surface of reducible quadrics in a 5-dimensional linear system of quadrics in IP 5.

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