Foreword 1. Abstract sets and mappings 2. Sums, monomorphisms and parts 3. Finite inverse limits 4. Colimits, epimorphisms and the axiom of choice 5. Mapping sets and exponentials 6. Summary of the axioms and an example of variable sets 7. Consequences and uses of exponentials 8. More on power sets 9. Introduction to variable sets 10. Models of additional variation Appendices Bibliography.
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