EN
CONTENTS
Introduction............................................................................................................ 5
Chapter I. PRELIMINARIES
1. Notation. Categories and functors................................................................ 8
2. Concrete categories................................................................................................ 12
3. Power functors. Set-theoretical lemmas............................................................. 16
4. The category of equivalence relations................................................................. 19
5. Pseudo-reflections and reflections...................................................................... 20
6. Universal points. Generators and cogenerators................................................ 21
Chapter II. DUALITY. GENERALIZED EMBEDDINGS AND QUOTIENTS
7. Dual notions in concrete categories........................................................... 23
8. D-preorders and C-preorders............................................................................... 27
9. Generalized images, coimages, embeddings and quotients........................ 33
Chapter III. THE CONDITIONS OF TRANSFER AND OF UNICITY
10. Definitions, examples, and basic properties.......................................... 38
11. The "transfer" functor ........................................................................................... 42
12. The "unicity" functor............................................................................................... 44
13. The "unique transfer" functor............................................................................... 46
14. Structures and concrete categories................................................................... 48
Chapter IV. THE CATEGORY OF LOGICAL KITS
15. Definitions and basic properties................................................................ 51
16. Adjoints of some forgetful functors.................................................................... 55
17. Coproducts of logical kits.................................................................................... 58
18. Coequalizers in the category of logical kits...................................................... 61
References .......................................................................................................... 64