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(Section 3)

You should recall how to find the union and intersection of sets of numbers.
If X and Y are two given sets of numbers, then
the set of all numbers belonging to both X and Y is denoted  and is called the INTERSECTION of X and Y;
the set of all numbers belonging to X or Y or both is denoted  and is called the UNION of X and Y.
 
For the discrete sets of numbers below you can use Venn diagrams.  For the sets of numbers which are continuous you may wish to use number lines.
Check Your Understanding: (Remember to write your answers down.)
1. 
2.   
3. Integers  Rational Numbers =
4. Natural Numbers  Whole Numbers =
5.
6.
7. 
8.

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This page was modified on 03/21/16

Rahn, 2000