Set Notation - Western Oregon University
SET NOTATION
Here is a quick summary of the correct notation used in writing number intervals. There are basically two ways to write number intervals:
(1) Interval Notation and (2) Set Builder Notation Set Builder Notation can be written in two ways. One uses braces { } and the other does not. In algebra courses we usually use Interval Notation. But the shortened version of Set Builder Notation is also fine. Using brackets is not recommended!
Numbers
All real numbers
All real numbers between -2 and 3, including neither -2 nor 3 All real numbers between -2 and 3, including -2 but not including 3 All real numbers between -2 and 3, not including -2 but including 3 All real numbers between -2 and 3, including both -2 and 3 All real numbers less than -2 but not equal to -2, not including -2 All real numbers less than -2, including -2 All real numbers greater than 3 but not equal to 3, not including 3 All real numbers greater than or equal to 3, including 3
Interval Notation
, 2, 3 2, 3 2, 3 2, 3 , 2 , 2 3, 3,
Set Builder
All real numbers*
2
3
2
3
2
3
2
3
2
2
3
3
Set Builder with { }
All real numbers*
|2
3
|2
3
|2
3
|2
3
|
2
|
2
|3
|3
*Note that "the set of all real numbers" can be written as a script upper case R. In
handwriting we usually make a double line in the left down stroke of the R to indicate this.
Also please note that, while some may argue to the contrary, the notation
is
not considered standard.
Courtesy of Cathy Aune, Mathematics Instructor, WOU
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