Geometry

Algebraic Geometry I: Algebraic Curves, Algebraic Manifolds by I. R. Shafarevich (auth.), I. R. Shafarevich (eds.) PDF

By I. R. Shafarevich (auth.), I. R. Shafarevich (eds.)

ISBN-10: 3540637052

ISBN-13: 9783540637059

ISBN-10: 3642578780

ISBN-13: 9783642578786

From the studies of the 1st printing, released as quantity 23 of the Encyclopaedia of Mathematical Sciences:
"This volume... comprises papers. the 1st, written via V.V.Shokurov, is dedicated to the speculation of Riemann surfaces and algebraic curves. it's a superb review of the speculation of family members among Riemann surfaces and their types - complicated algebraic curves in advanced projective areas. ... the second one paper, written by way of V.I.Danilov, discusses algebraic types and schemes. ...
i will suggest the booklet as an outstanding creation to the fundamental algebraic geometry."
European Mathematical Society e-newsletter, 1996

"... To sum up, this e-book is helping to benefit algebraic geometry very quickly, its concrete kind is pleasant for college students and divulges the wonderful thing about mathematics."
Acta Scientiarum Mathematicarum, 1994

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Additional info for Algebraic Geometry I: Algebraic Curves, Algebraic Manifolds and Schemes

Example text

13 Proposition. The form (3) is unimodular. Hence the group HI (8, Z) has a basis at, bt, ... , ag , bg in which Such, for example, is the basis given by the edges of a development with symbol alblal1bl1 ... agbga;lb;l, as we go around its boundary in the positive direction (see the Corollary of Sect. 7 and Fig. 13). Corollary (cf. Dubrovin, Novikov & Fomenko [1984]). The unimodular form (3) induces the isomorphism known as Poincare duality,' § 4. 15). A more detailed treatment of calculus on differentiable manifolds can be found in Griffiths-Harris [1978]' Narasimhan [1968]' Spivak [1965], and Wells [1973].

A mapping of topological spaces f: X ~ Y is said to be proper if the inverse image of any compact subset is compact. For example, this is always the case if X is compact. Definition. A mapping of Riemann surfaces is said to be finite if it is nonconstant and proper. Example 1. II)) ~ II)) is a finite mapping. Example 2. Let f: 8 1 ~ 8 2 be a finite mapping of Riemann surfaces and let U be an open subset of 8 2 . Then, for any connected component 8 of 1 (U), the mapping f: 8 ~ f (8) is finite. r Example 3.

The equation of f(8) is obtained as follows. Let (xo : Xl : X2) be homogeneous coordinates in CP2. By Corollary 1, the meromorphic functions f*(XO/X2) and f*(Xt/X2) E M(S) are algebraically dependent over C. Let F(ZI' Z2) be a complex polynomial of minimal degree d defining an algebraic relation F(J*(XO/X2)' f*(Xt/X2)) = O. Then the polynomial x~ F(XO/X2, Xt/X2) is irreducible and defines the curve f(8). Conversely, we have: Corollary 4. Let C C CP2 be an irreducible algebraic curve. Then there exists a compact Riemann surface 8 and a holomorphic mapping f: S --t CP2, whose image is identical with C.

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Algebraic Geometry I: Algebraic Curves, Algebraic Manifolds and Schemes by I. R. Shafarevich (auth.), I. R. Shafarevich (eds.)


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