Read e-book online Algebraic Geometry III: Complex Algebraic Varieties PDF

By Viktor S. Kulikov, P. F. Kurchanov, V. V. Shokurov (auth.), A. N. Parshin, I. R. Shafarevich (eds.)

ISBN-10: 3642081185

ISBN-13: 9783642081187

ISBN-10: 3662036622

ISBN-13: 9783662036624

The first contribution of this EMS quantity as regards to complicated algebraic geometry touches upon a few of the principal difficulties during this sizeable and intensely lively sector of present learn. whereas it truly is a lot too brief to supply entire insurance of this topic, it offers a succinct precis of the components it covers, whereas offering in-depth insurance of yes extremely important fields - a few examples of the fields handled in larger aspect are theorems of Torelli variety, K3 surfaces, version of Hodge buildings and degenerations of algebraic varieties.
the second one half offers a short and lucid creation to the new paintings at the interactions among the classical sector of the geometry of complicated algebraic curves and their Jacobian forms, and partial differential equations of mathematical physics. The paper discusses the paintings of Mumford, Novikov, Krichever, and Shiota, and will be a very good better half to the older classics at the topic by means of Mumford.

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Extra resources for Algebraic Geometry III: Complex Algebraic Varieties Algebraic Curves and Their Jacobians

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Let T = en I r be the quotient complex torus. The complex structure on en induces a complex structure on T and gives it the structure of a Kahler manifold, whose Kahler metric is induced by an arbitrary hermitian metric hijdZi ® d:Zj with constant coefficients on en . Conversely, given a Kahler metric ds 2 = "'£ hij (z )dzi ® tlzj on the torus T, we can integrate the coefficients of this metric over T to obtain a Kahler metric with constant coefficients "'£ hijdZi ® tlzj, where where dV is a translation-invariant volume form, rescaled so that the volume of T is 1.

Furthermore, dim H 2 (X, JR) = 1 and so the class of the form {}in H 2 (X, IR) is a multiple of an integral class. It should be further remarked that for a Hodge manifold, both the Lefschetz decomposition and the quadratic form Q are defined over Z. 9. To conclude this section we will give an example of a Kahler manifold which is not a Hodge manifold. In order to do this, consider a discrete subgroup (lattice) r of en generated by 2n vectors linearly independent over JR. Let T = en I r be the quotient complex torus.

For an inclusion of manifolds i : Y '-+ X we have a commutative diagram, where i* is induced by restriction of forms defined on X to Y. Therefore, a closed non-singular submanifold of a Hodge manifold is a Hodge manifold (with the induced metric). In particular, every non-singular projective variety is a Hodge manifold. Kodaira proved (Kodaira (1954]) that the converse is also true, that is, any Hodge manifold can be embedded into a projective space. 47 Periods of Integrals and Hodge Structures The above implies, in particular, that every compact non-singular curve (dime X = 1) is an algebraic variety.

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Algebraic Geometry III: Complex Algebraic Varieties Algebraic Curves and Their Jacobians by Viktor S. Kulikov, P. F. Kurchanov, V. V. Shokurov (auth.), A. N. Parshin, I. R. Shafarevich (eds.)


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