<p><strong>This unique book on commutative algebra is divided into two parts in order to facilitate its use in several types of courses.</strong></p> <p>The first introductory part covers the basic theory, connections with algebraic geometry, computational aspects, and extensions to module theory. T
Commutative Algebra (De Gruyter Textbook)
✍ Scribed by Aron Simis
- Publisher
- De Gruyter
- Year
- 2023
- Tongue
- English
- Leaves
- 371
- Edition
- 2nd, revised
- Category
- Library
No coin nor oath required. For personal study only.
✦ Synopsis
The primary audience for this book is students and the young researchers interested in the core of the discipline. Commutative algebra is by and large a self-contained discipline, which makes it quite dry for the beginner with a basic training in elementary algebra and calculus.
A stable mathematical discipline such as this enshrines a vital number of topics to be learned at an early stage, more or less universally accepted and practiced. Naturally, authors tend to turn these topics into an increasingly short and elegant list of basic facts of the theory. So, the shorter the better. However, there is a subtle watershed between elegance and usefulness, especially if the target is the beginner. From my experience throughout years of teaching, elegance and terseness do not do it, except much later in the carrier. To become useful, the material ought to carry quite a bit of motivation through justification and usefulness pointers.
On the other hand, it is difficult to contemplate these teaching devices in the writing of a short book. I have divided the material in three parts. starting with more elementary sections, then carrying an intermezzo on more difficult themes to make up for a smooth crescendo with additional tools and, finally, the more advanced part, versing on a reasonable chunk of present-day steering of commutative algebra.
Historic notes at the end of each chapter provide insight into the original sources and background information on a particular subject or theorem.
Exercises are provided and propose problems that apply the theory to solve concrete questions (yes, with concrete polynomials, and so forth).
✦ Table of Contents
cover
Thanks
Foreword
Foreword to the second edition
Contents
Part I
1 Basic introductory theory
1.1 Commutative rings and ideals
1.1.1 Ideals, generators, residue classes
1.1.2 Ideal operations
1.1.3 Prime and primary ideals
1.1.4 A source of examples: monomial ideals
1.2 Algebras
1.2.1 Polynomials and finitely generated algebras
1.2.2 The transcendence degree
1.2.3 Basic properties of the transcendence degree
1.3 Historic note
1.3.1 Terminology
1.3.2 Early roots
1.4 Exercises
2 Main tools
2.1 Rings of fractions
2.1.1 General properties of fractions
2.1.2 Local rings and symbolic powers
2.2 Integral ring extensions
2.2.1 Preliminaries
2.2.2 The Krull/Cohen–Seidenberg theorems
2.2.3 Integral closure of ideals
2.3 Krull dimension and Noether normalization
2.3.1 Behavior in integral extensions
2.3.2 Noether normalization and the dimension theorem
2.3.3 Complements to Noether’s theorem
2.4 Nullstellensatz
2.5 Dimension theory I
2.5.1 Noetherian and Artinian rings
2.5.2 Associated primes
2.5.3 Krull’s principal ideal theorem
2.5.4 Dimension under extensions
2.6 Primary decomposition
2.6.1 The nature of the components
2.6.2 The Lasker–Noether fundamental theorem
2.7 Hilbert characteristic function
2.7.1 Basics on the underlying graded structures
2.7.2 First results
2.7.3 More advanced steps
2.7.4 The formula of van der Waerden
2.7.5 Multiplicities galore
2.8 Historic note
2.8.1 Fractions
2.8.2 Prüfer and the determinantal trick
2.8.3 Noether and Krull
2.8.4 Primary decomposition
2.8.5 Hilbert and Artin
2.8.6 The Lasker–Noether binary
2.8.7 Hilbert function
2.9 Exercises
3 Overview of module theory
3.1 Exact sequences
3.2 Internal properties
3.2.1 Chain conditions
3.2.2 Composition series
3.3 External operations
3.3.1 Modules of fractions
3.3.2 The Hom operation
3.3.3 Tensor product
3.3.4 Exterior and symmetric powers
3.4 Free presentation and Fitting ideals
3.5 Torsion and torsion-free modules
3.6 Historic note
3.6.1 Composition series
3.6.2 Fitting ideals
3.15 Exercises
4 Derivations, differentials and Jacobian ideals
4.1 Preliminaries
4.1.1 Derivations of subalgebras
4.1.2 Derivations with values in a larger ring
4.2 Differential structures
4.2.1 A first structure theorem
4.2.2 The universal module of differentials
4.2.3 The conormal exact sequence
4.2.4 Kähler differentials
4.3 The issue of regularity in algebra and geometry
4.3.1 The Jacobian ideal
4.3.2 Hypersurfaces
4.4 Differents and ramification
4.4.1 Ramification
4.4.2 Purity
4.5 Historic note
4.6 Exercises
Part II
5 Basic advanced theory
5.1 Dimension theory
5.1.1 Annihilators, 1
5.1.2 The Nakayama lemma
5.1.3 The Krull dimension and systems of parameters
5.2 Associated primes and primary decomposition
5.2.1 Annihilators, 2
5.2.2 Associated primes
5.2.3 Primary decomposition
5.3 Depth and Cohen–Macaulay modules
5.3.1 Basic properties of depth
5.3.2 Mobility of depth
5.4 Cohen–Macaulay modules
5.4.1 Special properties of Cohen–Macaulay modules
5.4.2 Gorenstein rings
5.5 Historic note
5.5.1 Dimension
5.5.2 Primary decomposition
5.5.3 The depth behind the curtains
5.5.4 The KruCheSam theorem
5.6 Exercises
6 Homological methods
6.1 Regular local rings
6.1.1 Relation to basic invariants
6.1.2 Properties
6.2 The homological tool for Noetherian rings
6.2.1 Projective modules
6.2.2 Homological dimension
6.2.3 Chain complexes
6.2.4 Basics on derived functors
6.2.5 Properties of injective modules
6.2.6 Rees theorem and perfect ideals
6.3 The method of the Koszul complex
6.3.1 Preliminaries and definitions
6.3.2 Long exact sequences of Koszul homology
6.3.3 The theorem of Serre
6.4 Variations on the Koszul complex: determinantal ideals
6.4.1 The Eagon–Northcott complex
6.4.2 The Scandinavian complex
6.4.3 The Japanese–Polish complex
6.4.4 The Osnabrück–Recife–Salvador complex
6.5 Historic note
6.5.1 Projective modules
6.5.2 Homology
6.5.3 Injective modules
6.5.4 Determinantal ideals
6.25 Exercises
7 Graded structures
7.1 Graded preliminaries
7.2 The symmetric algebra
7.2.1 Torsion-freeness
7.2.2 Ideals of linear type, I
7.2.3 Dimension
7.3 Rees algebras
7.3.1 Geometric roots
7.3.2 Dimension
7.3.3 On the associated graded ring
7.3.4 The fiber cone and the analytic spread
7.3.5 Ideals of linear type, II
7.3.6 Special properties (survey)
7.3.7 A glimpse of specialization methods
7.4 Hilbert function of modules
7.4.1 Combinatorial preliminaries
7.4.2 The graded Hilbert function
7.4.3 Intertwining graded Hilbert functions
7.4.4 The local Hilbert–Samuel function
7.5 Historic note
7.5.1 The Rees algebra
7.5.2 The associated graded ring
7.5.3 The symmetric algebra
7.5.4 Artin–Rees lemma
7.5.5 Associativity formulas
7.6 Exercises
Bibliography
Index
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