You may be faced with questions that ask you to find the union or intersection of a set of numbers or lines. Usually, set notation is used to demonstrate the relationship between elements of information. A set is simply a group of things, such as numbers, objects, ideas, places, or geometric shapes. The items in the group are called elements and are surrounded by braces or { }.

elements-in-a-set

subsets-in-a-set

union-of-sets

intersection-of-sets

Though you will likely only be tested on elements, subsets, union, and intersection with set notation, there are many symbols involving sets that have specific actions and meanings.

Review this chart of symbols in set notation and their definitions:

set-notation-symbols