Algebraic Geometry over the Complex Numbers (Universitext) by Donu Arapura

By Donu Arapura

This can be a fairly fast moving graduate point creation to complicated algebraic geometry, from the fundamentals to the frontier of the topic. It covers sheaf concept, cohomology, a few Hodge concept, in addition to a number of the extra algebraic elements of algebraic geometry. the writer often refers the reader if the remedy of a undeniable subject is instantly on hand in different places yet is going into huge aspect on themes for which his remedy places a twist or a extra obvious standpoint. His instances of exploration and are selected very rigorously and intentionally. The textbook achieves its objective of taking new scholars of complicated algebraic geometry via this a deep but vast advent to an unlimited topic, ultimately bringing them to the leading edge of the subject through a non-intimidating sort.

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In the sequel, we usually denote π (x0 , . . , xn ) by [x0 , . . , xn ]. Then Pn is given the quotient topology, which is defined so that U ⊂ Pn is open if and only if π −1U is open. Define a function f : U → C to be holomorphic exactly when f ◦ π is holomorphic. 16), and the pair (Pn , OPn ) is a complex manifold. In fact, if we set Ui = {[x0 , . . , xn ] | xi = 0}, then the map [x0 , . . , xn ] → (x0 /xi , . . , xi /xi , . . , xn /xi ) induces an isomorphism Ui ∼ = Cn . The notation . . , x, .

Let f : X → C be holomorphic. Since X is compact, | f | attains a maximum somewhere, say at x0 ∈ X. The set S = f −1 ( f (x0 )) is closed by continuity. It is also open by the maximum principle. So S = X. 3. A holomorphic function is constant on a nonsingular complex projective variety. Proof. PnC with its classical topology is compact, since the unit sphere in Cn+1 maps onto it. Therefore any submanifold of it is also compact. 3 for algebraic varieties over arbitrary fields. We first need a good substitute for compactness.

An n-dimensional complex manifold together with its sheaf of C∞ functions is a 2n-dimensional C∞ manifold. Proof. An n-dimensional complex manifold (X, OX ) is locally biholomorphic to a ball in Cn , and hence (X,CX∞ ) is locally diffeomorphic to the same ball regarded as a subset of R2n . Later on, we will need to write things in coordinates. The pullbacks of the standard coordinates on a ball B ⊂ Cn under local biholomorphism from X ⊃ B ∼ = B, are referred to as local analytic coordinates on X.

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