Read e-book online Algebraic geometry I. Algebraic curves, manifolds, and PDF

By I. R. Shafarevich

ISBN-10: 0387519955

ISBN-13: 9780387519951

This quantity of the Encyclopaedia includes elements. the 1st is dedicated to the idea of curves, that are taken care of from either the analytic and algebraic issues of view. beginning with the fundamental notions of the idea of Riemann surfaces the reader is lead into an exposition masking the Riemann-Roch theorem, Riemann's primary life theorem, uniformization and automorphic capabilities. The algebraic fabric additionally treats algebraic curves over an arbitrary box and the relationship among algebraic curves and Abelian kinds. the second one half is an advent to higher-dimensional algebraic geometry. the writer offers with algebraic forms, the corresponding morphisms, the speculation of coherent sheaves and, eventually, the idea of schemes. This ebook is a truly readable creation to algebraic geometry and may be immensely important to mathematicians operating in algebraic geometry and complicated research and particularly to graduate scholars in those fields.

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Extra resources for Algebraic geometry I. Algebraic curves, manifolds, and schemes

Example text

B) Holomorphic Functions and Holomorphic Maps Let M be an /t-dimensional complex manifold, { z j , . . } the system of local complex coordinates, Uj the dommn of z^, and % = Zj(Uj), L e t / be a real- or complex-valued function defined on a domain Da M. 4) then fjizj) is a function of n complex variables ( z i , . . , z „ ) defined in Q)j = Zj{DnUj)c:%. ,(z,), we have/(z,) = A(zfc). Since p^ Zj = Zj(p) is 3. homeomorphism, / is continuous in D if and only if each fj(Zj) is continuous in ^j with respect to Zj.

If M is a complex manifold, and { z i , . . } is the system of local complex coordinates of M, each domain Uj is called a coordinate neighbourhood. We call local complex coordinates simply local coordinates or a local coordinate system. , Zj{p)) of C" is called the local (complex) coordinates of p. Let pe M. , Zj) = Zj(p). 2) which transforms the local coordinates z^ = ( z ^ , . . , z^) = z^ip) into the local coordinates z, = ( z j , . . ) is, by definition, a biholomorphic map. Since peUj is determined uniquely by its local coordinates Zj = Zj{p), identifying Uj with % via Zj, we can consider that a complex manifold M is obtained by glueing the domains ^ j , .

Put W = C and fix a complex number (o with Im w > 0. Let G be the group consisting of all parallel translations of the form g^„: z -^ z + mo) + n, with m,neZ. G is properly discontinuous and fixed point free on W. Let F be the parallelogram in C with vertices 0, 1, a> + 1, and co. Then LJ gmn(F) = ^' Consequently C = C/G is a compact Riemann surface. C is obtained from F by identifying x, 0 ^ x ^ 1, with x-\-(o, and ^o;, 0 ^ ^ ^ 1, with t(o-{-\. Hence C is diifeomorphic to a torus, and the genus of C is equal to 1.

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Algebraic geometry I. Algebraic curves, manifolds, and schemes by I. R. Shafarevich


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