10 Commutative Algebra
-
Section 10.1: Introduction
-
Section 10.2: Conventions
-
Section 10.3: Basic notions
-
Section 10.4: Snake lemma
-
Section 10.5: Finite modules and finitely presented modules
-
Section 10.6: Ring maps of finite type and of finite presentation
-
Section 10.7: Finite ring maps
-
Section 10.8: Colimits
-
Section 10.9: Localization
-
Section 10.10: Internal Hom
-
Section 10.11: Characterizing finite and finitely presented modules
-
Section 10.12: Tensor products
-
Section 10.13: Tensor algebra
-
Section 10.14: Base change
-
Section 10.15: Miscellany
-
Section 10.16: Cayley-Hamilton
-
Section 10.17: The spectrum of a ring
-
Section 10.18: Local rings
-
Section 10.19: The Jacobson radical of a ring
-
Section 10.20: Nakayama's lemma
-
Section 10.21: Open and closed subsets of spectra
-
Section 10.22: Connected components of spectra
-
Section 10.23: Glueing properties
-
Section 10.24: Glueing functions
-
Section 10.25: Zerodivisors and total rings of fractions
-
Section 10.26: Irreducible components of spectra
-
Section 10.27: Examples of spectra of rings
-
Section 10.28: A meta-observation about prime ideals
-
Section 10.29: Images of ring maps of finite presentation
-
Section 10.30: More on images
-
Section 10.31: Noetherian rings
-
Section 10.32: Locally nilpotent ideals
-
Section 10.33: Curiosity
-
Section 10.34: Hilbert Nullstellensatz
-
Section 10.35: Jacobson rings
-
Section 10.36: Finite and integral ring extensions
-
Section 10.37: Normal rings
-
Section 10.38: Going down for integral over normal
-
Section 10.39: Flat modules and flat ring maps
-
Section 10.40: Supports and annihilators
-
Section 10.41: Going up and going down
-
Section 10.42: Separable extensions
-
Section 10.43: Geometrically reduced algebras
-
Section 10.44: Separable extensions, continued
-
Section 10.45: Perfect fields
-
Section 10.46: Universal homeomorphisms
-
Section 10.47: Geometrically irreducible algebras
-
Section 10.48: Geometrically connected algebras
-
Section 10.49: Geometrically integral algebras
-
Section 10.50: Valuation rings
-
Section 10.51: More Noetherian rings
-
Section 10.52: Length
-
Section 10.53: Artinian rings
-
Section 10.54: Homomorphisms essentially of finite type
-
Section 10.55: K-groups
-
Section 10.56: Graded rings
-
Section 10.57: Proj of a graded ring
-
Section 10.58: Noetherian graded rings
-
Section 10.59: Noetherian local rings
-
Section 10.60: Dimension
-
Section 10.61: Applications of dimension theory
-
Section 10.62: Support and dimension of modules
-
Section 10.63: Associated primes
-
Section 10.64: Symbolic powers
-
Section 10.65: Relative assassin
-
Section 10.66: Weakly associated primes
-
Section 10.67: Embedded primes
-
Section 10.68: Regular sequences
-
Section 10.69: Quasi-regular sequences
-
Section 10.70: Blow up algebras
-
Section 10.71: Ext groups
-
Section 10.72: Depth
-
Section 10.73: Functorialities for Ext
-
Section 10.74: An application of Ext groups
-
Section 10.75: Tor groups and flatness
-
Section 10.76: Functorialities for Tor
-
Section 10.77: Projective modules
-
Section 10.78: Finite projective modules
-
Section 10.79: Open loci defined by module maps
-
Section 10.80: Faithfully flat descent for projectivity of modules
-
Section 10.81: Characterizing flatness
-
Section 10.82: Universally injective module maps
-
Section 10.83: Descent for finite projective modules
-
Section 10.84: Transfinite dévissage of modules
-
Section 10.85: Projective modules over a local ring
-
Section 10.86: Mittag-Leffler systems
-
Section 10.87: Inverse systems
-
Section 10.88: Mittag-Leffler modules
-
Section 10.89: Interchanging direct products with tensor
-
Section 10.90: Coherent rings
-
Section 10.91: Examples and non-examples of Mittag-Leffler modules
-
Section 10.92: Countably generated Mittag-Leffler modules
-
Section 10.93: Characterizing projective modules
-
Section 10.94: Ascending properties of modules
-
Section 10.95: Descending properties of modules
-
Section 10.96: Completion
-
Section 10.97: Completion for Noetherian rings
-
Section 10.98: Taking limits of modules
-
Section 10.99: Criteria for flatness
-
Section 10.100: Base change and flatness
-
Section 10.101: Flatness criteria over Artinian rings
-
Section 10.102: What makes a complex exact?
-
Section 10.103: Cohen-Macaulay modules
-
Section 10.104: Cohen-Macaulay rings
-
Section 10.105: Catenary rings
-
Section 10.106: Regular local rings
-
Section 10.107: Epimorphisms of rings
-
Section 10.108: Pure ideals
-
Section 10.109: Rings of finite global dimension
-
Section 10.110: Regular rings and global dimension
-
Section 10.111: Auslander-Buchsbaum
-
Section 10.112: Homomorphisms and dimension
-
Section 10.113: The dimension formula
-
Section 10.114: Dimension of finite type algebras over fields
-
Section 10.115: Noether normalization
-
Section 10.116: Dimension of finite type algebras over fields, reprise
-
Section 10.117: Dimension of graded algebras over a field
-
Section 10.118: Generic flatness
-
Section 10.119: Around Krull-Akizuki
-
Section 10.120: Factorization
-
Section 10.121: Orders of vanishing
-
Section 10.122: Quasi-finite maps
-
Section 10.123: Zariski's Main Theorem
-
Section 10.124: Applications of Zariski's Main Theorem
-
Section 10.125: Dimension of fibres
-
Section 10.126: Algebras and modules of finite presentation
-
Section 10.127: Colimits and maps of finite presentation
-
Section 10.128: More flatness criteria
-
Section 10.129: Openness of the flat locus
-
Section 10.130: Openness of Cohen-Macaulay loci
-
Section 10.131: Differentials
-
Section 10.132: The de Rham complex
-
Section 10.133: Finite order differential operators
-
Section 10.134: The naive cotangent complex
-
Section 10.135: Local complete intersections
-
Section 10.136: Syntomic morphisms
-
Section 10.137: Smooth ring maps
-
Section 10.138: Formally smooth maps
-
Section 10.139: Smoothness and differentials
-
Section 10.140: Smooth algebras over fields
-
Section 10.141: Smooth ring maps in the Noetherian case
-
Section 10.142: Overview of results on smooth ring maps
-
Section 10.143: Étale ring maps
-
Section 10.144: Local structure of étale ring maps
-
Section 10.145: Étale local structure of quasi-finite ring maps
-
Section 10.146: Local homomorphisms
-
Section 10.147: Integral closure and smooth base change
-
Section 10.148: Formally unramified maps
-
Section 10.149: Conormal modules and universal thickenings
-
Section 10.150: Formally étale maps
-
Section 10.151: Unramified ring maps
-
Section 10.152: Local structure of unramified ring maps
-
Section 10.153: Henselian local rings
-
Section 10.154: Filtered colimits of étale ring maps
-
Section 10.155: Henselization and strict henselization
-
Section 10.156: Henselization and quasi-finite ring maps
-
Section 10.157: Serre's criterion for normality
-
Section 10.158: Formal smoothness of fields
-
Section 10.159: Constructing flat ring maps
-
Section 10.160: The Cohen structure theorem
-
Section 10.161: Japanese rings
-
Section 10.162: Nagata rings
-
Section 10.163: Ascending properties
-
Section 10.164: Descending properties
-
Section 10.165: Geometrically normal algebras
-
Section 10.166: Geometrically regular algebras
-
Section 10.167: Geometrically Cohen-Macaulay algebras
-
Section 10.168: Colimits and maps of finite presentation, II