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From Objects to Diagrams for Ranges of Functors 2011 ed. [Paperback / softback]

  • Format: Paperback / softback, 158 pages, height x width: 235x155 mm, weight: 454 g, 19 Illustrations, black and white; X, 158 p. 19 illus., 1 Paperback / softback
  • Series: Lecture Notes in Mathematics 2029
  • Pub. Date: 09-Jul-2011
  • Publisher: Springer-Verlag Berlin and Heidelberg GmbH & Co. K
  • ISBN-10: 3642217737
  • ISBN-13: 9783642217739
  • Paperback / softback
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  • Format: Paperback / softback, 158 pages, height x width: 235x155 mm, weight: 454 g, 19 Illustrations, black and white; X, 158 p. 19 illus., 1 Paperback / softback
  • Series: Lecture Notes in Mathematics 2029
  • Pub. Date: 09-Jul-2011
  • Publisher: Springer-Verlag Berlin and Heidelberg GmbH & Co. K
  • ISBN-10: 3642217737
  • ISBN-13: 9783642217739
This work introduces tools, from the field of category theory, that make it possible to tackle until now unsolvable representation problems (determination of the range of a given functor). The basic idea is: if a functor lifts many objects, then it also lifts many (poset-indexed) diagrams.
1 Background
1(34)
1.1 Introduction
1(13)
1.1.1 The Search for Functorial Solutions to Certain Representation Problems
2(3)
1.1.2 Partially Functorial Solutions to Representation Problems
5(3)
1.1.3 Contents of the Book
8(4)
1.1.4 How Not to Read the Book
12(2)
1.2 Basic Concepts
14(10)
1.2.1 Set Theory
14(1)
1.2.2 Stone Duality for Boolean Algebras
15(1)
1.2.3 Partially Ordered Sets (Posets) and Lattices
15(2)
1.2.4 Category Theory
17(3)
1.2.5 Directed Colimits of First-Order Structures
20(4)
1.3 Kappa-Presented and Weakly Kappa-Presented Objects
24(2)
1.4 Extension of a Functor by Directed Colimits
26(7)
1.5 Projectability Witnesses
33(2)
2 Boolean Algebras That Are Scaled with Respect to a Poset
35(16)
2.1 Pseudo Join-Semilattices, Supported Posets, and Almost Join-Semilattices
35(3)
2.2 P-Normed Spaces, P-Scaled Boolean Algebras
38(3)
2.3 Directed Colimits and Finite Products of P-Scaled Boolean Algebras
41(2)
2.4 Finitely Presented P-Scaled Boolean Algebras
43(2)
2.5 Normal Morphisms in BoolP and in BTopP
45(2)
2.6 Norm-Coverings of a Poset; The Structures 2[ p] and F(X)
47(4)
3 The Condensate Lifting Lemma (CLL)
51(30)
3.1 The Functor A → A S; Condensates
51(2)
3.2 Lifters and the Armature Lemma
53(4)
3.3 The Lowenheim-Skolem Condition and the Buttress Lemma
57(3)
3.4 Larders and the Condensate Lifting Lemma
60(3)
3.5 Infinite Combinatorics and Lambda-Lifters
63(7)
3.6 Lifters, Retracts, and Pseudo-Retracts
70(4)
3.7 Lifting Diagrams Without Assuming Lifters
74(3)
3.8 Left and Right Larders
77(4)
4 Getting Larders from Congruence Lattices of First-Order Structures
81(36)
4.1 The Category of All Monotone-Indexed Structures
82(4)
4.2 Directed Colimits of Monotone-Indexed Structures
86(3)
4.3 The Relative Congruence Lattice Functor with Respect to a Generalized Quasivariety
89(5)
4.4 Preservation of Small Directed Colimits by the Relative Compact Congruence Functor
94(1)
4.5 Ideal-Induced Morphisms and Projectability Witnesses in Generalized Quasivarieties
95(3)
4.6 An Extension of the Lowenheim-Skolem Theorem
98(3)
4.7 A Diagram Version of the Gratzer-Schmidt Theorem
101(3)
4.8 Right 0-Larders from Congruence-Proper Quasivarieties
104(4)
4.9 Relative Critical Points Between Quasivarieties
108(5)
4.10 Strong Congruence-Properness of Certain Finitely Generated Varieties of Algebras
113(1)
4.11 A Potential Use of Larders on Non-regular Cardinals
114(3)
5 Congruence-Permutable, Congruence-Preserving Extensions of Lattices
117(14)
5.1 The Category of Semilattice-Metric Spaces
118(1)
5.2 The Category of All Semilattice-Metric Covers
119(1)
5.3 A Family of Unliftable Squares of Semilattice-Metric Spaces
120(4)
5.4 A Left Larder Involving Algebras and Semilattice-Metric Spaces
124(2)
5.5 CPCP-Retracts and CPCP-Extensions
126(5)
6 Larders from Von Neumann Regular Rings
131(8)
6.1 Ideals of Regular Rings and of Lattices
131(5)
6.2 Right Larders from Regular Rings
136(3)
7 Discussion
139(4)
References 143(3)
List of Figures 146(3)
Symbol Index 149(4)
Subject Index 153(4)
Author Index 157