Download Algebraic Geometry III: Complex Algebraic Varieties by Viktor S. Kulikov, P. F. Kurchanov, V. V. Shokurov (auth.), PDF

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

The first contribution of this EMS quantity with reference to advanced algebraic geometry touches upon some of the significant difficulties during this huge and extremely lively region of present study. whereas it truly is a lot too brief to supply entire assurance of this topic, it offers a succinct precis of the components it covers, whereas supplying in-depth assurance of sure extremely important fields - a few examples of the fields handled in better element are theorems of Torelli kind, K3 surfaces, version of Hodge buildings and degenerations of algebraic varieties.
the second one half presents a quick and lucid advent to the new paintings at the interactions among the classical quarter of the geometry of complicated algebraic curves and their Jacobian kinds, and partial differential equations of mathematical physics. The paper discusses the paintings of Mumford, Novikov, Krichever, and Shiota, and will be an exceptional spouse to the older classics at the topic via Mumford.

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Let V be a hypersurface of X. The linear functional fv ¢on H 2n- 2(X, Z) defines a homology class (V) E H2n-2(X, Z). The Poincare dual class 1rv E H 2 (X, C) is called the fundamental class of the hypersurface V. Define the fundamental class 1r D E H 2 (X, C) of a divisor D = E r i Vi as Using Stokes' theorem it is not too hard to obtain the following (see GriffithsBarris [1978]). Theorem. If L = [D] for some divisor D on a compact complex manifold X, then c1(L) = 7rD· In the exact sequence (14) the morphism j : H 2 (X, Z)--+ H 2 (X, Ox) can be represented as a composition If X is a compact Kahler manifold, it can be shown that the morphism a coincides with the projection II0 ,2 onto the space of harmonic (0, 2)-forms, and hence the kernel of a contains the cocycles of H'f 1 (Z) C H 2 (X, Z) which can be represented by closed (1, 1)-forms.

And on Ua n U~ n U-rn V = dfa = d(ha~J~) = f~dha~ + ha~dj~ = ha[Jd/{3· 54 Vik. S. Kulikov, P. F. Kurchanov Consequently, the sections dfa. nV, Ov(Nir )) define a global nowhere vanishing section of the bundle (Nir] 0 [V]Iv· Thus, Nv 0 (V]Iv is a trivial bundle and (15) Nv = [-V]Iv· One of the most important line bundles on X, dim X = n is the canonical bundle Kx = 1\nT}.. Holomorphic sections of the canonical bundle are holomorphic forms of the highest degree, that is, Ox(Kx) = flx. To compute the canonical bundle K v of a non-singular hypersurface V of a complex manifold X, there is the following adjunction formula: Kv = (Kx 0 (V]Iv).

Let g be a holomorphic function in some neighborhood of x and let V be a hypersurface. Choose a local equation f for Vat x. Then g = fkh, where the function h (holomorphic at x) doesn't vanish along V. Evidently, the exponent k does not depend on the choice of the local equation f for V, and it can be shown that it does not change as we move from x to another point on V. Thus, the order ordv(g) of the function g along Vis well defined: ordv(g) = k. It is easy to see that ordv(Yt92) = ordv(Yt) + ordv(g2).

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