Sets of Numbers

2.1 Outline

1. Denoting sets
   1. undefined term; set
   2. circular definition
   3. specifying sets
      1. description method
      2. roster method
   4. well-defined set
   5. terms
      1. members
      2. elements
      3. belong to
      4. contained in
   6. Sets of numbers
      1. natural numbers
      2. counting numbers
      3. integers
      4. rational numbers
   7. set-builder notation
2. Equal and equivalent sets