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Set theory

Set A collection or group of objects.
element An object that belongs to a set. Sometimes the word "member" is used.
complement of a set The elements in the universe that are not in the set.
disjoint sets Sets that have no common elements.
empty set A set that has no elements. It is sometimes called the null set.
finite set Any set whose elements can be counted.
infinite set Any set whose elements cannot be counted.
subset A set that contains only elements found in another set.
proper subset A subset that does not contain every element in another set.
Created by: Ambur