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Elements
The members of a set.
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Intersection
The intersection of two sets, denoted A∩B ("A intersect B") is the set of all members contained in both A and B.
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Union
The union of two sets, denoted A∪B ("A union B"), is the set of all members contained in either A or B or both.
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Venn diagram
A representation of two or more sets that shows the relationship between them: