15 More on Algebra
- Section 15.1: Introduction
- Section 15.2: Advice for the reader
- Section 15.3: Stably free modules
- Section 15.4: A comment on the Artin-Rees property
- Section 15.5: Fibre products of rings, I
- Section 15.6: Fibre products of rings, II
- Section 15.7: Fibre products of rings, III
- Section 15.8: Fitting ideals
- Section 15.9: Lifting
- Section 15.10: Zariski pairs
- Section 15.11: Henselian pairs
- Section 15.12: Henselization of pairs
- Section 15.13: Lifting and henselian pairs
- Section 15.14: Absolute integral closure
- Section 15.15: Auto-associated rings
-
Section 15.16: Flattening stratification
- Lemma 15.16.1
- Section 15.17: Flattening over an Artinian ring
- Section 15.18: Flattening over a closed subset of the base
- Section 15.19: Flattening over a closed subsets of source and base
- Section 15.20: Flattening over a Noetherian complete local ring
- Section 15.21: Descent of flatness along integral maps
- Section 15.22: Torsion free modules
- Section 15.23: Ranks of modules
-
Section 15.24: Reflexive modules
- Definition 15.24.1
- Lemma 15.24.2
- Lemma 15.24.3
- Lemma 15.24.4
- Lemma 15.24.5
- Lemma 15.24.6
- Lemma 15.24.7
- Lemma 15.24.8
- Definition 15.24.9
- Lemma 15.24.10
- Lemma 15.24.11
- Lemma 15.24.12
- Lemma 15.24.13
- Lemma 15.24.14
- Lemma 15.24.15
- Lemma 15.24.16
- Example 15.24.17
- Lemma 15.24.18
- Lemma 15.24.19
- Lemma 15.24.20
- Section 15.25: Content ideals
- Section 15.26: Flatness and finiteness conditions
- Section 15.27: Blowing up and flatness
- Section 15.28: Completion and flatness
- Section 15.29: The Koszul complex
- Section 15.30: The extended alternating Čech complex
- Section 15.31: Koszul regular sequences
- Section 15.32: More on Koszul regular sequences
- Section 15.33: Regular ideals
- Section 15.34: Local complete intersection maps
- Section 15.35: Cartier's equality and geometric regularity
- Section 15.36: Geometric regularity
- Section 15.37: Topological rings and modules
- Section 15.38: Formally smooth maps of topological rings
- Section 15.39: Formally smooth maps of local rings
- Section 15.40: Some results on power series rings
- Section 15.41: Geometric regularity and formal smoothness
- Section 15.42: Regular ring maps
- Section 15.43: Ascending properties along regular ring maps
- Section 15.44: Permanence of properties under completion
- Section 15.45: Permanence of properties under étale maps
- Section 15.46: Permanence of properties under henselization
- Section 15.47: Field extensions, revisited
- Section 15.48: The singular locus
- Section 15.49: Regularity and derivations
- Section 15.50: Formal smoothness and regularity
- Section 15.51: G-rings
- Section 15.52: Properties of formal fibres
- Section 15.53: Excellent rings
- Section 15.54: Abelian categories of modules
-
Section 15.55: Injective abelian groups
- Lemma 15.55.1
- Section 15.56: Injective modules
- Section 15.57: Derived categories of modules
- Section 15.58: Computing Tor
- Section 15.59: Tensor products of complexes
- Section 15.60: Derived tensor product
- Section 15.61: Derived change of rings
- Section 15.62: Tor independence
- Section 15.63: Spectral sequences for Tor
- Section 15.64: Products and Tor
- Section 15.65: Künneth spectral sequence
- Section 15.66: Pseudo-coherent modules, I
- Section 15.67: Pseudo-coherent modules, II
- Section 15.68: Tor dimension
- Section 15.69: Spectral sequences for Ext
- Section 15.70: Projective dimension
- Section 15.71: Injective dimension
- Section 15.72: Modules which are close to being projective
- Section 15.73: Hom complexes
- Section 15.74: Sign rules
- Section 15.75: Derived hom
- Section 15.76: Perfect complexes
- Section 15.77: Lifting complexes
- Section 15.78: Splitting complexes
- Section 15.79: Recognizing perfect complexes
- Section 15.80: Characterizing perfect complexes
- Section 15.81: Strong generators and regular rings
- Section 15.82: Relatively finitely presented modules
- Section 15.83: Relatively pseudo-coherent modules
- Section 15.84: Pseudo-coherent and perfect ring maps
- Section 15.85: Relatively perfect modules
- Section 15.86: Two term complexes
- Section 15.87: The naive cotangent complex
- Section 15.88: Rlim of abelian groups
- Section 15.89: Rlim of modules
- Section 15.90: Torsion modules
-
Section 15.91: Formal glueing of module categories
- Lemma 15.91.1
- Lemma 15.91.2
- Lemma 15.91.3
- Lemma 15.91.4
- Lemma 15.91.5
- Lemma 15.91.6
- Lemma 15.91.7
-
Lemma 15.91.8
- Equation 15.91.8.1
- Lemma 15.91.9
- Remark 15.91.10
- Lemma 15.91.11
- Lemma 15.91.12
- Lemma 15.91.13
- Lemma 15.91.14
- Lemma 15.91.15
- Proposition 15.91.16
- Lemma 15.91.17
- Theorem 15.91.18
- Proposition 15.91.19
- Remark 15.91.20
- Remark 15.91.21
-
Section 15.92: The Beauville-Laszlo theorem
- Lemma 15.92.1
- Lemma 15.92.2
- Lemma 15.92.3
- Lemma 15.92.4 reference
- Remark 15.92.5
- Lemma 15.92.6
- Remark 15.92.7
- Remark 15.92.8
- Example 15.92.9
- Lemma 15.92.10
- Remark 15.92.11
- Example 15.92.12: Non glueable module reference
- Lemma 15.92.13
- Lemma 15.92.14
- Lemma 15.92.15 reference
-
Theorem 15.92.16
reference
- Equation 15.92.16.1
- Equation 15.92.16.2
- Equation 15.92.16.3
- Remark 15.92.17
- Lemma 15.92.18
- Lemma 15.92.19
- Remark 15.92.20
-
Section 15.93: Derived Completion
- Lemma 15.93.1
- Lemma 15.93.2
- Lemma 15.93.3
- Definition 15.93.4
- Proposition 15.93.5
- Lemma 15.93.6
- Lemma 15.93.7
- Lemma 15.93.8
- Lemma 15.93.9
- Lemma 15.93.10 slogan
- Remark 15.93.11
- Lemma 15.93.12
- Lemma 15.93.13
- Lemma 15.93.14
- Situation 15.93.15
- Lemma 15.93.16
- Lemma 15.93.17
- Lemma 15.93.18
- Lemma 15.93.19
- Lemma 15.93.20 slogan reference
- Lemma 15.93.21
- Lemma 15.93.22
- Example 15.93.23
- Lemma 15.93.24
- Lemma 15.93.25
-
Section 15.94: The category of derived complete modules
- Lemma 15.94.1
- Section 15.95: Derived completion for a principal ideal
- Section 15.96: Derived completion for Noetherian rings
- Section 15.97: An operator introduced by Berthelot and Ogus
- Section 15.98: Perfect complexes and the eta operator
- Section 15.99: Taking limits of complexes
- Section 15.100: Some evaluation maps
-
Section 15.101: Base change for derived hom
-
Lemma 15.101.1
- Equation 15.101.1.1
- Lemma 15.101.2
-
Lemma 15.101.1
- Section 15.102: Systems of modules
- Section 15.103: Systems of modules, bis
- Section 15.104: Miscellany
- Section 15.105: Tricks with double complexes
-
Section 15.106: Weakly étale ring maps
- Definition 15.106.1
- Lemma 15.106.2
- Definition 15.106.3
- Lemma 15.106.4
- Lemma 15.106.5
- Lemma 15.106.6
- Lemma 15.106.7
- Lemma 15.106.8
- Lemma 15.106.9
- Lemma 15.106.10
- Lemma 15.106.11
- Lemma 15.106.12
- Lemma 15.106.13
- Lemma 15.106.14
- Lemma 15.106.15
- Lemma 15.106.16
- Lemma 15.106.17
- Lemma 15.106.18
- Lemma 15.106.19
- Lemma 15.106.20
- Lemma 15.106.21
- Lemma 15.106.22
- Lemma 15.106.23
- Theorem 15.106.24: Olivier
- Section 15.107: Weakly étale algebras over fields
- Section 15.108: Local irreducibility
- Section 15.109: Miscellaneous on branches
- Section 15.110: Branches of the completion
- Section 15.111: Formally catenary rings
- Section 15.112: Group actions and integral closure
- Section 15.113: Extensions of discrete valuation rings
- Section 15.114: Galois extensions and ramification
- Section 15.115: Krasner's lemma
- Section 15.116: Abhyankar's lemma and tame ramification
-
Section 15.117: Eliminating ramification
- Definition 15.117.1
- Example 15.117.2
- Lemma 15.117.3
- Lemma 15.117.4
- Lemma 15.117.5
- Lemma 15.117.6
- Lemma 15.117.7
- Lemma 15.117.8
- Lemma 15.117.9
- Lemma 15.117.10
- Lemma 15.117.11
- Lemma 15.117.12
- Lemma 15.117.13
- Lemma 15.117.14
- Lemma 15.117.15
-
Lemma 15.117.16
- Equation 15.117.16.1
- Equation 15.117.16.2
- Lemma 15.117.17
- Theorem 15.117.18: Epp
- Section 15.118: Eliminating ramification, II
- Section 15.119: Picard groups of rings
- Section 15.120: Determinants
- Section 15.121: Perfect complexes and K-groups
- Section 15.122: Determinants of endomorphisms of finite length modules
- Section 15.123: A regular local ring is a UFD
- Section 15.124: Determinants of complexes
- Section 15.125: Extensions of valuation rings
- Section 15.126: Structure of modules over a PID
- Section 15.127: Principal radical ideals
- Section 15.128: Invertible objects in the derived category
- Section 15.129: Splitting off a free module
- Section 15.130: Big projective modules are free