Download e-book for iPad: Algebraic Geometry and Commutative Algebra (Universitext) by Siegfried Bosch

By Siegfried Bosch

ISBN-10: 1447148290

ISBN-13: 9781447148296

Algebraic geometry is an engaging department of arithmetic that mixes tools from either, algebra and geometry. It transcends the restricted scope of natural algebra by way of geometric building ideas. additionally, Grothendieck’s schemes invented within the past due Fifties allowed the appliance of algebraic-geometric equipment in fields that previously appeared to be distant from geometry, like algebraic quantity idea. the recent innovations prepared the ground to superb development similar to the evidence of Fermat’s final Theorem by means of Wiles and Taylor.

The scheme-theoretic method of algebraic geometry is defined for non-experts. extra complex readers can use the booklet to develop their view at the topic. A separate half bargains with the required must haves from commutative algebra. On a complete, the ebook offers a really available and self-contained advent to algebraic geometry, as much as a fairly complicated level.

Every bankruptcy of the e-book is preceded by way of a motivating creation with an off-the-cuff dialogue of the contents. average examples and an abundance of workouts illustrate every one part. this manner the booklet is a wonderful answer for studying on your own or for complementing wisdom that's already current. it could actually both be used as a handy resource for classes and seminars or as supplemental literature.

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Additional info for Algebraic Geometry and Commutative Algebra (Universitext)

Example text

If we get ai = p from this for trivial reasons. 1. Namely, for ideals a1 , . . , an and a prime ideal p of R, we have the equivalence n n aj ⊂ p ⇐⇒ V j=1 aj ⊃ V (p). j=1 Indeed, the implication “ =⇒ ” is obtained by looking at the zeros of the ideals involved, whereas the implication “ ⇐= ” uses the formation of ideals I(·) of vanishing functions, as introduced above, in conjunction with rad(p) = p. Furthermore, we can use the assertion of Lemma 8 to show n n aj = V j=1 V (aj ). j=1 Thus, given an inclusion V (p) ⊂ nj=1 V (aj ), Lemma 8 yields the existence of an index i, 1 ≤ i ≤ n, such that V (p) ⊂ V (ai ).

An R-algebra (associative, commutative, and with a unit 1) is a ring A equipped with a structure of an R-module such that the compatibility rule r · (x · y) = (r · x) · y = x · (r · y) holds for all r ∈ R and x, y ∈ A where “ · ” denotes both, the ring multiplication and the scalar multiplication on A. ✲ B is a map that is a homomorphism A morphism of R-algebras A with respect to the ring and the module structures on A and B. ✲ A, we can easily view A as an Given any ring homomorphism f : R R-algebra via f ; just set r · x = f (r) · x for r ∈ R and x ∈ A.

Then N = g(g −1 (N )), as the image of a finitely generated R-module, must be finitely generated itself. Next, let M and M be Noetherian and let N ⊂ M be a submodule. Then N gives rise to the short exact sequence 0 ✲ f −1 (N ) ✲ N ✲ g(N ) ✲ 0 and it follows that f −1 (N ) ⊂ M as well as g(N ) ⊂ M are submodules of finite type. Applying Proposition 5 we see that N is of finite type. As a direct consequence we can show: Corollary 11. Let M1 , M2 be Noetherian R-modules. Then: (i) M1 ⊕ M2 is Noetherian.

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Algebraic Geometry and Commutative Algebra (Universitext) by Siegfried Bosch

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