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15 More on Algebra
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Section 15.1: Introduction
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Section 15.2: Advice for the reader
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Section 15.3: Stably free modules
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Section 15.4: A comment on the Artin-Rees property
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Section 15.5: Fibre products of rings, I
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Section 15.6: Fibre products of rings, II
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Section 15.7: Fibre products of rings, III
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Section 15.8: Fitting ideals
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Section 15.9: Lifting
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Section 15.10: Zariski pairs
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Section 15.11: Henselian pairs
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Section 15.12: Henselization of pairs
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Section 15.13: Lifting and henselian pairs
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Section 15.14: Absolute integral closure
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Section 15.15: Auto-associated rings
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Section 15.16: Flattening stratification
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Section 15.17: Flattening over an Artinian ring
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Section 15.18: Flattening over a closed subset of the base
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Section 15.19: Flattening over a closed subsets of source and base
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Section 15.20: Flattening over a Noetherian complete local ring
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Section 15.21: Descent of flatness along integral maps
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Section 15.22: Torsion free modules
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Section 15.23: Reflexive modules
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Section 15.24: Content ideals
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Section 15.25: Flatness and finiteness conditions
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Section 15.26: Blowing up and flatness
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Section 15.27: Completion and flatness
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Section 15.28: The Koszul complex
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Section 15.29: The extended alternating Čech complex
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Section 15.30: Koszul regular sequences
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Section 15.31: More on Koszul regular sequences
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Section 15.32: Regular ideals
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Section 15.33: Local complete intersection maps
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Section 15.34: Cartier's equality and geometric regularity
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Section 15.35: Geometric regularity
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Section 15.36: Topological rings and modules
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Section 15.37: Formally smooth maps of topological rings
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Section 15.38: Formally smooth maps of local rings
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Section 15.39: Some results on power series rings
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Section 15.40: Geometric regularity and formal smoothness
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Section 15.41: Regular ring maps
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Section 15.42: Ascending properties along regular ring maps
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Section 15.43: Permanence of properties under completion
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Section 15.44: Permanence of properties under étale maps
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Section 15.45: Permanence of properties under henselization
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Section 15.46: Field extensions, revisited
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Section 15.47: The singular locus
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Section 15.48: Regularity and derivations
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Section 15.49: Formal smoothness and regularity
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Section 15.50: G-rings
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Section 15.51: Properties of formal fibres
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Section 15.52: Excellent rings
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Section 15.53: Abelian categories of modules
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Section 15.54: Injective abelian groups
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Section 15.55: Injective modules
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Section 15.56: Derived categories of modules
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Section 15.57: Computing Tor
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Section 15.58: Tensor products of complexes
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Section 15.59: Derived tensor product
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Section 15.60: Derived change of rings
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Section 15.61: Tor independence
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Section 15.62: Spectral sequences for Tor
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Section 15.63: Products and Tor
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Section 15.64: Pseudo-coherent modules, I
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Section 15.65: Pseudo-coherent modules, II
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Section 15.66: Tor dimension
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Section 15.67: Spectral sequences for Ext
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Section 15.68: Projective dimension
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Section 15.69: Injective dimension
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Section 15.70: Modules which are close to being projective
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Section 15.71: Hom complexes
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Section 15.72: Sign rules
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Section 15.73: Derived hom
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Section 15.74: Perfect complexes
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Section 15.75: Lifting complexes
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Section 15.76: Splitting complexes
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Section 15.77: Recognizing perfect complexes
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Section 15.78: Characterizing perfect complexes
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Section 15.79: Strong generators and regular rings
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Section 15.80: Relatively finitely presented modules
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Section 15.81: Relatively pseudo-coherent modules
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Section 15.82: Pseudo-coherent and perfect ring maps
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Section 15.83: Relatively perfect modules
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Section 15.84: Two term complexes
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Section 15.85: The naive cotangent complex
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Section 15.86: Rlim of abelian groups
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Section 15.87: Rlim of modules
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Section 15.88: Torsion modules
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Section 15.89: Formal glueing of module categories
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Section 15.90: The Beauville-Laszlo theorem
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Section 15.91: Derived Completion
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Section 15.92: The category of derived complete modules
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Section 15.93: Derived completion for a principal ideal
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Section 15.94: Derived completion for Noetherian rings
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Section 15.95: An operator introduced by Berthelot and Ogus
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Section 15.96: Perfect complexes and the eta operator
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Section 15.97: Taking limits of complexes
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Section 15.98: Some evaluation maps
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Section 15.99: Base change for derived hom
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Section 15.100: Systems of modules
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Section 15.101: Systems of modules, bis
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Section 15.102: Miscellany
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Section 15.103: Tricks with double complexes
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Section 15.104: Weakly étale ring maps
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Section 15.105: Weakly étale algebras over fields
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Section 15.106: Local irreducibility
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Section 15.107: Miscellaneous on branches
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Section 15.108: Branches of the completion
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Section 15.109: Formally catenary rings
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Section 15.110: Group actions and integral closure
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Section 15.111: Extensions of discrete valuation rings
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Section 15.112: Galois extensions and ramification
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Section 15.113: Krasner's lemma
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Section 15.114: Abhyankar's lemma and tame ramification
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Section 15.115: Eliminating ramification
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Section 15.116: Eliminating ramification, II
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Section 15.117: Picard groups of rings
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Section 15.118: Determinants
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Section 15.119: Perfect complexes and K-groups
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Section 15.120: Determinants of endomorphisms of finite length modules
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Section 15.121: A regular local ring is a UFD
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Section 15.122: Determinants of complexes
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Section 15.123: Extensions of valuation rings
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Section 15.124: Structure of modules over a PID
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Section 15.125: Principal radical ideals
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Section 15.126: Invertible objects in the derived category
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Section 15.127: Splitting off a free module
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Section 15.128: Big projective modules are free