Read e-book online Classification of Higher Dimensional Algebraic Varieties PDF

By Christopher D. Hacon, Sándor Kovács

ISBN-10: 3034602898

ISBN-13: 9783034602891

This publication specializes in fresh advances within the type of complicated projective kinds. it really is divided into elements. the 1st half supplies a close account of modern leads to the minimum version application. particularly, it includes a whole evidence of the theorems at the life of flips, at the lifestyles of minimum types for kinds of log normal style and of the finite iteration of the canonical ring. the second one half is an advent to the idea of moduli areas. It comprises themes similar to representing and moduli functors, Hilbert schemes, the boundedness, neighborhood closedness and separatedness of moduli areas and the boundedness for sorts of basic type.

The ebook is aimed toward complex graduate scholars and researchers in algebraic geometry.

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A stable curve is a projective curve with only normal crossing singularities and an ample canonical bundle. These are naturally degenerations of smooth projective curves of the same genus. By stable reduction (cf. 2]) every degeneration may be “resolved” to a stable one. These together imply that the moduli functor of stable curves of a given genus is a natural compactification of the moduli functor of smooth curves of the same genus. As we want to understand degenerations of our preferred families, we have to allow normal crossings.

I. 46. Let f W Y ! L/ D 0 for j > 0: Proof. 68]. Not suprisingly Kawamata-Viehweg vanishing has interesting applications to the study of the singularities of klt pairs. 9)) stating that klt singularities are rational. Next we recall another consequence of Kawamata-Viehweg vanishing which is used to prove a version of inversion of adjunction. 47 (Kollár-Shokurov Connectedness). Let f W Y P ! X be a proper birational morphism where Y is smooth and X is normal. K C D/ is f -nef, then Y P Supp. i Wdi 1 Di / is connected in a neighborhood of any fiber of f .

11. Show that if f W Y ! X / is a divisor on X and G is a divisor on Y , then Chapter 2. 1) If D is big (resp. 2) If D is big (resp. pseudo-effective) and F is effective and its support contains all f -exceptional divisors, then f 1 D C F is big (resp. 3) Show that if G G 0 , then f G f G 0 . Deduce from this that if G is big (resp. 4) Give an example where G is not big, but f G is big. 12. X / such that Di 0, D1 Q D2 and D1 ^ D2 D 0. D 3 / has a multiple which is mobile. 13. X /. Show that if k is minimal, then r 1 ; : : : ; rk are linearly independent over Q.

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Classification of Higher Dimensional Algebraic Varieties by Christopher D. Hacon, Sándor Kovács


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