By Jean-Pierre Demailly

ISBN-10: 7040305313

ISBN-13: 9787040305319

This quantity is a diffusion of lectures given through the writer on the Park urban arithmetic Institute (Utah) in 2008, and on different events. the aim of this quantity is to explain analytic options worthwhile within the research of questions touching on linear sequence, multiplier beliefs, and vanishing theorems for algebraic vector bundles. the writer goals to be concise in his exposition, assuming that the reader is already just a little familiar with the fundamental recommendations of sheaf idea, homological algebra, and intricate differential geometry. within the ultimate chapters, a few very fresh questions and open difficulties are addressed--such as effects relating to the finiteness of the canonical ring and the abundance conjecture, and effects describing the geometric constitution of Kahler kinds and their optimistic cones.

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**Example text**

Let i < n. Consider the 2n−i i (X, Q) ⊗ HB (X, Q) is the K¨ unneth component δ2n−i of ∆X , so δ2n−i ∈ HB ji class of an algebraic cycle Z on X × X. Let Yi → X be a smooth complete intersection of (n − i) ample hypersurfaces in X. 2]) says that 2n−i i ji∗ : HB (Yi , Q) → HB (X, Q) is surjective. It follows that the class of the cycle Z vanishes on X ×(X \Yi ). 29, there is an n-cycle Z supported on X × Yi such that the class (id, j)∗ [Z ] is equal to [Z]. Consider the morphism of Hodge structures induced by [Z ]: 2n−i i [Z ]∗ : HB (X, Q) → HB (Yi , Q).

The classes δi are algebraic, that is, are classes of algebraic cycles on X × X with rational coefficients. (b) Lefschetz operators and their inverses. Let L be an ample line bundle 2 on X, and l := c1 (L) ∈ HB (X, Q). 3] says that the cup-product map 2n−k k ln−k ∪ : HB (X, Q) → HB (X, Q) is an isomorphism. This is clearly an isomorphism of Hodge structure. 26 provides a Hodge class λn−k of degree 2k on X × X. The second standard conjecture we will consider (the Lefschetz conjecture or Conjecture B in the terminology of [61]) is the following.

19). 19, if Γ is cohomologous to 0, then Γ◦N belongs to F N CH(X × X)Q . As this filtration is conjectured to satisfy F k+1 CHk (X × X) = 0, we must have Γ◦N = 0 for N > 2n, n := dim X. For cycles algebraically equivalent to 0, the following result is proved independently in [96] and [99]. 25 (Voevodsky 1995, Voisin 1994). The nilpotence conjecture holds for cycles in X × X that are algebraically equivalent to 0. Proof. Let Γ ∈ CHd (X × X), d = dim X be algebraically equivalent to 0. This means that there is a curve C that we may assume to be smooth, a 0-cycle z ∈ CH0 (C) homologous to 0, and a correspondence Z ∈ CHd (C × X × X) such that Γ = Z∗ (z) in CHd (X × X).

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