Download A Course in Commutative Algebra by Gregor Kemper PDF

By Gregor Kemper

This textbook bargains a radical, sleek creation into commutative algebra. it truly is intented ordinarily to function a consultant for a process one or semesters, or for self-study. The conscientiously chosen material concentrates at the techniques and effects on the heart of the sector. The ebook keeps a relentless view at the normal geometric context, allowing the reader to achieve a deeper realizing of the cloth. even though it emphasizes thought, 3 chapters are dedicated to computational elements. Many illustrative examples and workouts increase the text.

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Extra resources for A Course in Commutative Algebra

Example text

1(a), this is the same as giving a dominant morphism X → K n . So trdeg(A) is the largest number n such that there exists a dominant morphism X → K n . This already links the transcendence degree to an intuitive concept of dimension. 20 on page 105). (b) If A = K[x1 , . . , xn ]/I is an affine algebra given by generators of an ideal I ⊆ K[x1 , . . , xn ], then trdeg(A) can be computed algorithmically by Gr¨ obner basis methods. We will see this in Chapter 9 (see on page 128). So equating dimension and transcendence degree brings the dimension into the realm of computability.

Xn ]) = n. Moreover, dim (K n ) = n if K is infinite, 0 if K is finite. Proof. With S := {x1 , . . 6 yields dim (K[x1 , . . , xn ]) ≤ n. Since we have the chain {0} (x1 ) (x1 , x2 ) ··· (x1 , . . 1) of length n in Spec (K[x1 , . . , xn ]), equality holds. Moreover, a chain of length m of closed, irreducible subsets Xi ⊆ K n gives rise to a chain of length m of ideals I(Xi ) ⊂ K[x1 , . . 10(a), so m ≤ n by the above. 1) are irreducible and provide a chain of length n, so dim (K n ) = n. 2(1).

3 Noetherian and Irreducible Spaces Motivated by the correspondence between ideals and Zariski-closed subsets, we can transport the definition of the Noether property to topological spaces in general. 7. Let X be a topological space. , for closed subsets Y1 , Y2 , Y3 , . . ⊆ X with Yi+1 ⊆ Yi for all positive integers i, there exists an integer n such that Yi = Yn for all i ≥ n. An equivalent condition is that the open subsets satisfy the ascending chain condition. (b) X is called irreducible if X is not the union of two proper, closed subsets, and X = ∅.

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