Definition: A set is a group of distinct elements such as objects or numbers. The union of two sets (∪) is the set of elements that are in either set. The intersection of two sets (∩) is the set of elements that are in both sets.
Other set notation:
{ } set
| such that
A ⊆ B A is a subset of B
Example: Let A = {1, 2, 3}. Let B = {0, 2, 4}.
Find A∩B.
Find A∪B.
Solution:
To find the intersection, we compare the two sets and see which elements are in both sets.
A∩B = {2}
To find the union, we look at the two sets and list all of the elements that are in either set or both.
A∪B = {0, 1, 2, 3, 4}
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