Intersection and Union
Main Concept

Given two intervals, the two major relations between them are their union and their intersection.
The union of two sets or intervals, and , is the set of elements which are in either set. This is denoted as .
The intersection of the two intervals, is the set of elements which are in both set. This is denoted as .



Click or drag to place two intervals on the number line. Choose whether to include, exclude, or set your end points to . Use the check boxes on the right to show the two intervals, their union, and their intersection.


Interval A

Left End Point:

Right End Point:




Interval B

Left End Point:

Right End Point:










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