1. The document defines analytic plane quadrants and ordered pairs. 2. An ordered pair (a,b) has a as the first element and b as the second element. Equality of ordered pairs means that the first elements are equal and the second elements are equal. 3. The document also defines notations for intervals on the real number line including closed, open, and half-open intervals.

1. Functions

2. Analytic plane x-axis y-axis origin 1 st quadrant (+,+) 2 nd quadrant (-,+) 3 rd quadrant (-,-) 4 th quadrant (+,-)

8. a b A = (a, b) denotes the set of all real numbers between a and b (a and b are excluded). A = [a, b) denotes the set of all real numbers between a and b (a is included and b is excluded). a b

9. a b A = (a, b] denotes the set of all real numbers between a and b (a is excluded and b is included).