Math Debrief
Math: TIMELINE
100-fundamentals
200 Set and Set theory
Relations
Order theory
Function Theory
debrief-name: math section-code: 280 section-name: domain-theory section-desc:
- Domain theory: LINKS
- Domain theory
Logic
510 Lambda Calculi
Type theory
Abstract Algebra
Category Theory
Number Theory
Theory of computation
debrief-name: math section-code: 900 section-name: aggregations section-desc: Aggregations, indices,
debrief-name: math section-code: 800 section-name: misc section-desc: Misc and unclassified mathemat
- 810-statistics
- 888-calculus
  - Calculus
  - Math › Calculus › TERMS

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Category Theory

Types of categories

Small category

A category is small if it has only a set's worth of arrows.

If 𝒞 is a small category, then there are functions (dom, cod, id) that send a morphism to its domain, its codomain, and an object to its identity.

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