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Book Categories |
Introduction | 1 | |
Overview | 3 | |
Prerequisites and notation | 8 | |
1 | Setting the stage | 11 |
1.1 | Clubs, skeletons and filtrations | 11 |
1.2 | Three types of embeddings | 14 |
1.3 | Projective Boolean algebras | 22 |
1.4 | Free extensions | 25 |
1.5 | Projective embeddings | 31 |
2 | rc-filtered Boolean algebras | 37 |
2.1 | rc-filtrations | 37 |
2.2 | The Freese/Nation property | 40 |
2.3 | Subalgebras | 44 |
2.4 | Homomorphic images | 47 |
2.5 | Products | 51 |
2.6 | First results about cardinal functions | 53 |
2.7 | Computation of cardinal functions | 56 |
2.8 | The free algebra on N[subscript 1] generators | 60 |
2.9 | [kappa]-metrization | 64 |
2.10 | Answers to some questions of Scepin | 66 |
3 | Functors | 69 |
3.1 | Generalities | 69 |
3.2 | Superextensions | 72 |
3.3 | Exponentials | 78 |
3.4 | Symmetric powers | 90 |
4 | [sigma]-filtered Boolean algebras | 97 |
4.1 | Commuting subalgebras | 97 |
4.2 | The weak Freese/Nation property | 100 |
4.3 | The strong Freese/Nation property | 106 |
5 | Weakly projective algebras | 111 |
5.1 | Completions and co-completeness | 111 |
5.2 | Cohen algebras | 115 |
5.3 | Characterizations of weak projectivity | 123 |
5.4 | Adequateness and closedness properties | 134 |
5.5 | Regularly filtered algebras | 140 |
6 | The twisted embedding | 147 |
6.1 | The basic square | 147 |
6.2 | Twisted embeddings | 151 |
6.3 | The non-weakly projective example | 159 |
6.4 | On the number of rc-filtered Boolean algebras | 160 |
A. Set-theoretic aspects | 165 | |
A.1 | Elementary substructures of [actual symbol not reproducible] | 165 |
A.2 | Characterizations | 176 |
A.3 | Answers to some other questions of Scepin | 183 |
A.4 | N[subscript 2]-projectively filtered Boolean algebras | 186 |
A.5 | Forcing projectivity | 192 |
References | 195 | |
Index | 200 |
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