Positivity in Algebraic Geometry II: Positivity for Vector by R.K. Lazarsfeld

By R.K. Lazarsfeld

Quantity paintings containing a latest account on "Positivity in Algebraic Geometry".

Both volumes additionally to be had as hardcover variants as Vols. forty eight and forty nine within the sequence "Ergebnisse der Mathematik und ihrer Grenzgebiete".

A good buy of the fabric has now not formerly seemed in e-book form.

Volume II is extra on the examine level and slightly extra really expert than quantity I.

Volume II encompasses a survey of positivity for vector bundles, and strikes directly to a scientific improvement of the speculation of multiplier beliefs and their applications. 

Contains many concrete examples, functions, and tips that could additional developments

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Additional resources for Positivity in Algebraic Geometry II: Positivity for Vector Bundles, and Multiplier Ideals

Example text

V). All of these statements hold if the “classical” bundles involved are replaced by Q-twists (provided in (ii ) that the sum or extension is defined ). Proof. Statement (i) follows immediately from the corresponding facts for nef line bundles. For the first assertion in (ii), suppose that E1 and E2 are nef, and fix any ample Q-divisor class h ∈ N 1 (X)Q . 8 (v). Extensions are treated in the same manner. Turning to (iii), note that S k E <δ> = S k E< k1 δ> , and so the amplitude of S k E < h > for all ample Q-divisor classes h is equivalent to the amplitude of S k E for all ample classes h .

G. [252, Chapter 6, §1 (iv)] for a quick overview. 1 on the cohomology of low-codimensional subvarieties of projective space. ] extended some of these results to subvarieties of other homogeneous varieties. 4] also proves a convexity estimate for M − X when X ⊆ M is any smooth subvariety whose normal bundle is ample and globally generated. B Ample Cotangent Bundles and Hyperbolicity We now consider smooth projective varieties with ample cotangent bundles. Such varieties are hyperbolic, and the theme is that they exhibit strong forms of properties known or expected for hyperbolic varieties.

16 Chapter 6. Ample and Nef Vector Bundles (i). E is nef if and only if the following condition is satisfied: Given any finite map ν : C −→ X from a smooth irreducible projective curve C to X, and given any quotient line bundle L of ν ∗ E, one has deg L ≥ 0. (ii). Fix an ample divisor class h ∈ N 1 (X) on X. Then E is ample if and only if there exists a positive rational number δ = δh > 0 such that deg L ≥ δ C · ν ∗ h for any ν : C −→ X and ν ∗ E (*) L as above. Note that in (ii) the constant δ is required to be independent of C, ν and L.

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