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Contents 8 | |
Preface to the Second Edition 5 | |
Preface to the First Edition 6 | |
Introduction 1 [11] | |
I. Categories, Functors, and Natural Transformations 7 [10] | |
1. Axioms for Categories 7 | |
2. Categories 10 | |
3. Functors 13 | |
4. Natural Transformations 16 | |
5. Monics, Epis, and Zeros 19 | |
6. Foundations 21 | |
7. Large Categories 24 | |
8. Hom-Sets 27 | |
II. Constructions on Categories 31 | |
1. Duality 31 | |
2. Contravariance and Opposites 33 | |
3. Products of Categories 36 | |
4. Functor Categories 40 | |
5. The Category of All Categories 42 | |
6. Comma Categories 45 | |
7. Graphs and Free Categories 48 | |
8. Quotient Categories 51 | |
III. Universals and Limits 55 [9] | |
1. Universal Arrows 55 | |
2. The Yoneda Lemma 59 | |
3. Coproducts and Colimits 62 | |
4. Products and Limits 68 | |
5. Categories with Finite Products 72 | |
6. Groups in Categories 75 | |
7. Colimits of Representable Functors 76 | |
IV. Adjoints 79 | |
1. Adjunctions 79 | |
2. Examples of Adjoints 86 | |
3. Reflective Subcategories 90 | |
4. Equivalence of Categories 92 | |
5. Adjoints for Preorders 95 | |
6. Cartesian Closed Categories 97 | |
7. Transformations of Adjoints 99 | |
8. Composition of Adjoints 103 | |
9. Subsets and Characteristic Functions 105 | |
10. Categories Like Sets 106 | |
V. Limits 109 | |
1. Creation of Limits 109 | |
2. Limits by Products and Equalizers 112 | |
3. Limits with Parameters 115 | |
4. Preservation of Limits 116 | |
5. Adjoints on Limits 118 | |
6. Freyd's Adjoint Functor Theorem 120 | |
7. Subobjects and Generators 126 | |
8. The Special Adjoint Functor Theorem 128 | |
9. Adjoints in Topology 132 | |
VI. Monads and Algebras 137 | |
1. Monads in a Category 137 | |
2. Algebras for a Monad 139 | |
3. The Comparison with Algebras 142 | |
4. Words and Free Semigroups 144 | |
5. Free Algebras for a Monad 147 | |
6. Split Coequalizers 149 | |
7. Beck's Theorem 151 | |
8. Algebras Are T-Algebras 156 | |
9. Compact Hausdorff Spaces 157 | |
VII. Monoids 161 [8] | |
1. Monoidal Categories 161 | |
2. Coherence 165 | |
3. Monoids 170 | |
4. Actions 174 | |
5. The Simplicial Category 175 | |
6. Monads and Homology 180 | |
7. Closed Categories 184 | |
8. Compactly Generated Spaces 185 | |
9. Loops and Suspensions 188 | |
VIII. Abelian Categories 191 | |
1. Kernels and Cokernels 191 | |
2. Additive Categories 194 | |
3. Abelian Categories 198 | |
4. Diagram Lemmas 202 | |
IX. Special Limits 211 [7] | |
1. Filtered Limits 211 | |
2. Interchange of Limits 214 | |
3. Final Functors 217 | |
4. Diagonal Naturality 218 | |
5. Ends 222 | |
6. Coends 226 | |
7. Ends with Parameters 228 | |
8. Iterated Ends and Limits 230 | |
X. Kan Extensions 233 | |
1. Adjoints and Limits 233 | |
2. Weak Universality 235 | |
3. The Kan Extension 236 | |
4. Kan Extensions as Coends 240 | |
5. Pointwise Kan Extensions 243 | |
6. Density 245 | |
7. All Concepts Are Kan Extensions 248 | |
XI. Symmetry and Braiding in Monoidal Categories 251 | |
1. Symmetric Monoidal Categories 251 | |
2. Monoidal Functors 255 | |
3. Strict Monoidal Categories 257 | |
4. The Braid Groups Bn and the Braid Category 260 | |
5. Braided Coherence 263 | |
6. Perspectives 266 | |
XII. Structures in Categories 267 | |
1. Internal Categories 267 | |
2. The Nerve of a Category 270 | |
3. 2-Categories 272 | |
4. Operations in 2-Categories 276 | |
5. Single-Set Categories 279 | |
6. Bicategories 281 | |
7. Examples of Bicategories 283 | |
8. Crossed Modules and Categories in Grp 285 | |
Appendix. Foundations 289 [6] | |
Table of Standard Categories: Objects and Arrows 293 [5] | |
Table of Terminology 295 [4] | |
Bibliography 297 [3] | |
Index 303 |
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slurp | |
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([] (map-zipper {})) | |
([root] | |
(zip/zipper (constantly true) :children | |
#(assoc %1 :children %2) | |
root))) | |
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(map #(next (re-matches #"^(\t*)(.+?) (\d+)\s*(-?\[\d+\])?\s*$" %))) | |
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{:indent indent | |
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([{:keys [loc]}] | |
(zip/root loc)) | |
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