Download Commutative Algebra: with a View Toward Algebraic Geometry by David Eisenbud PDF

By David Eisenbud

This can be a complete evaluation of commutative algebra, from localization and first decomposition via size idea, homological tools, unfastened resolutions and duality, emphasizing the origins of the guidelines and their connections with different elements of arithmetic. The booklet offers a concise remedy of Grobner foundation idea and the confident tools in commutative algebra and algebraic geometry that move from it. Many workouts integrated.

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Additional info for Commutative Algebra: with a View Toward Algebraic Geometry (Graduate Texts in Mathematics, Volume 150)

Example text

6 (Nullstellensatz). Let k be an algebraically closed field. If Ie k[Xl, ... , xnJ is an ideal, then I(Z(I)) = radIo Thus, the correspondences I f---t Z(I) and X f---t I(X) induce a bijection between the collection of algebraic subsets of Ak = k n and radical ideals of k[Xl, ... ,XnJ. We shall later give five different proofs offorms of the Nullstellensatz. 19. Three 34 1. Roots of Commutative Algebra more proofs are given in the exercises to Chapter 4, and the fifth is given in Chapter 13. 8. 10.

The algebra R is a subring of A(X), so R is reduced. Suppose further that k is algebraically closed. By the Nullstellensatz, R = A(Y) for some algebraic set Y, which may be identified with the set of maximal ideals of R. Furthermore, there is a natural map 7f : X -+ Y determined as follows: A point x E X corresponds to a maximal ideal mx of A(X). 9, the composite map k -+ A(X) -+ A(X)/mx is an isomorphism. It follows that the composite map k -+ R -+ R/(Rnm x) is an isomorphism, so that Rnmx is a maximal ideal of R.

Number theorists soon appreciated how useful it was to adjoin solutions of polynomial equations to Z, and they found that in many ways the enlarged rings behaved much like Z itself. Euler, Gauss, Dirichlet, and Kummer all used this idea for the rings Z[(], with ( a root of unity, to prove some special cases of Fermat's last theorem (the insolubility in integers of the equation xn + yn = zn). Around 1847, Lame thought he had a proof in general based on this method, but Liouville was quick to point out problems.

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