Download Algebraic geometry II. Cohomology of algebraic varieties. by I.R. Shafarevich, R. Treger, V.I. Danilov, V.A. Iskovskikh PDF

By I.R. Shafarevich, R. Treger, V.I. Danilov, V.A. Iskovskikh

This EMS quantity includes components. the 1st half is dedicated to the exposition of the cohomology conception of algebraic types. the second one half bargains with algebraic surfaces. The authors have taken pains to give the fabric carefully and coherently. The e-book includes a variety of examples and insights on numerous topics.This e-book may be immensely important to mathematicians and graduate scholars operating in algebraic geometry, mathematics algebraic geometry, complicated research and similar fields.The authors are recognized specialists within the box and I.R. Shafarevich is additionally recognized for being the writer of quantity eleven of the Encyclopaedia.

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Extra info for Algebraic geometry II. Cohomology of algebraic varieties. Algebraic surfaces

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For k = 1 the generic splitting type is aE = (1, 0), for on any line L which does not meet Y the restriction E|L is given by 0 → OL → E|L → OL (1) → 0, and this sequence splits because H 1 (L, OL (−1)) = 0. For k = 2 we have for any line L ⊂ P2 with L ∩ Y = ∅ that E|L is given by the extension 0 → OL → E|L → OL (2) → 0. This however does not mean that the splitting type of E on these lines is (2, 0), for not all extensions of OL (2) by OL split. In fact the generic splitting type for k = 2 is aE = (1, 1), for (1, 1) is the (lexicographically) smallest possible pair (a, b) with a ≥ b and a + b = 2 and on a line L which meets exactly one point xi 54 1.

The examples of Tango give simple (n − 1)-bundles over Pn . Indecomposable (n − 2)-bundles over Pn are difficult to construct and are known only for n = 4 (examples of Horrocks and Mumford [68], cf. , example 6) and n = 5 (cf. Horrocks [69]). The following theorem of Barth and Van de Ven [9] also sheds some light on this problem: a holomorphic 2-bundle over Pn which can be holomorphically extended over arbitrary PN ⊃ Pn is necessarily of the form OPn (a) ⊕ OPn (b). This theorem has played an important psychological rˆole in the development and has been written by Tjurin [128] and Sato [103] for bundles of arbitrary rank.

Uniform bundles In this paragraph we explain the “standard construction”, which systematizes the study of a vector bundle over Pn by considering its restrictions to lines. As a first application we find that a bundle whose restriction to every line through some given point is trivial must itself be trivial. Then we show that uniform r-bundles over Pn always split if r < n. This is no longer true for r ≥ n (see the remarks at the end of this section). Finally we give an example of a uniform bundle which is not homogeneous.

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