# Math Help - Question about parenthesis

1. ## Question about parenthesis

When we talk about interval notation we use () or []. The () means that the points are not included. The [] tells us that the points are included. When we talk about ordered pairs when we graph a function we use (). Now if these ponts are included in the function why do we use () and not []. Why do the two not correspond with one another? Thank you for your explations.

2. Originally Posted by schinb64
When we talk about interval notation we use () or []. The () means that the points are not included. The [] tells us that the points are included. When we talk about ordered pairs when we graph a function we use (). Now if these ponts are included in the function why do we use () and not []. Why do the two not correspond with one another? Thank you for your explations.
The two notations have nothing to do with one another. And think about it: If, in the point (x, y), x and y are not included then what are the coordinates of the point??

-Dan