A Singular introduction to commutative algebra by Gert-Martin Greuel, Visit Amazon's Gerhard Pfister Page,

By Gert-Martin Greuel, Visit Amazon's Gerhard Pfister Page, search results, Learn about Author Central, Gerhard Pfister, , O. Bachmann, C. Lossen, H. Schönemann

From the reports of the 1st edition:"It is unquestionably no exaggeration to assert that - a novel advent to Commutative Algebra goals to guide yet another degree within the computational revolution in commutative algebra. one of the nice strengths and such a lot precise positive factors is a brand new, thoroughly unified therapy of the worldwide and native theories. making it essentially the most versatile and most productive structures of its type....another energy of Greuel and Pfister's e-book is its breadth of insurance of theoretical subject matters within the parts of commutative algebra closest to algebraic geometry, with algorithmic remedies of just about each topic....Greuel and Pfister have written a particular and hugely necessary e-book that are supposed to be within the library of each commutative algebraist and algebraic geometer, specialist and amateur alike.J.B. Little, MAA, March 2004The moment variation is considerably enlarged through a bankruptcy on Groebner bases in non-commtative jewelry, a bankruptcy on attribute and triangular units with functions to basic decomposition and polynomial fixing and an appendix on polynomial factorization together with factorization over algebraic box extensions and absolute factorization, within the uni- and multivariate case.

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If k = 1 then, since x1 ∈ P1 , we obtain x2 · . . · xn ∈ P1 . This implies that x ∈ P1 for some > 1 which is a contradiction to the choice of x ∈ j= Pj . If k > 1 then, since x2 · . . · xn ∈ Pk , we obtain x1 ∈ Pk which is again a contradiction to the choice of x1 ∈ j=1 Pj . Many of the concepts introduced so far in this section can be treated effectively using Singular. We define a quotient ring and test equality and the zerodivisor property in the quotient ring. 13 (computation in quotient rings).

4) K[x]> is a Noetherian ring. (5) K[x]> is factorial. 2 (1) are flat ring morphisms. Proof. 5 (4) since LM(u) = 1 implies u ∈ x . (2) If f /u is a unit in K[x]> , there is a h/v such that (f /u) · (h/v) = 1. Hence, f h = uv and LM(f ) LM(h) = 1, which implies LM(f ) = 1. 40 1. 5 (2), K[x] = K[x]> if and only if S> consists of units of K[x], that is if and only if S> ⊂ K ∗ , which is equivalent to > being global. The second equality follows since K[x] x consists of units in K[x]> if and only if every polynomial with non–zero constant term belongs to S> which is equivalent to > being local.

We need to show the theorem only for n = 1, the general case follows by induction. We argue by contradiction. Let us assume that there exists an ideal I ⊂ A[x] which is not finitely generated. Choose polynomials f1 ∈ I, f2 ∈ I f1 , . . , fk+1 ∈ I f 1 , . . , fk , . . of minimal possible degree. If di = deg(fi ), fi = ai xdi + lower terms in x , then d1 ≤ d2 ≤ . . and a1 ⊂ a1 , a2 ⊂ . . is an ascending chain of ideals in A. By assumption it is stationary, that is, a1 , . . , ak = a1 , . . , ak+1 for some k, hence, ak+1 = ki=1 bi ai for suitable bi ∈ A.

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