1.1 A brief history of category theory

1.3 What is requested from the student

1.4 Category theory references

**3 Fundamental Considerations in Set**

**4 Categories and Functors, Without Admitting It**

4.5 Databases: schemas and instances

5.2 Common categories and functors from pure math

5.4 Categories and schemas are equivalent, **Cat** » **Sch**