## Section 2.1: Sets, Subsets, and Venn Diagrams

## 2.1 Outline

- Denoting sets
- undefined term; set
- circular definition
- specifying sets
- description method
- roster method

- well-defined set
- terms
- members
- elements
- belong to
- contained in

- Sets of numbers
- natural numbers
- counting numbers
- integers
- rational numbers

- set-builder notation

- Equal and equivalent sets