Types of interval Lecture by Megha Sharma.

Interval notation is a way of writing subsets of the real number line. A closed interval is one that includes its endpoints: for example, the set {x | –3 x 1} To write this interval in interval notation, we use closed brackets [ ]:example-[-3,1]An open interval is one that does not include its endpoints, for example, {x | –3 x 1}. To write this interval in interval notation, use Open brackets()