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The cardinality of a set A, written as |A| or #(A), is the number of elements in A. Cardinality may be interpreted as "set size" or "the number of elements in a set". For example, given the set we can count the number of elements it contains, a total of six. Thus, the cardinality of the set A is 6, or . Since sets can be infinite, the cardinality of a set can be an infinity. Being able to determine the size of a set is of great importance in understanding principles from discrete mathematics and finite mathematics, but other subjects as well, including advanced set theory and combinatorics.

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  • Cardinality
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  • The cardinality of a set A, written as |A| or #(A), is the number of elements in A. Cardinality may be interpreted as "set size" or "the number of elements in a set". For example, given the set we can count the number of elements it contains, a total of six. Thus, the cardinality of the set A is 6, or . Since sets can be infinite, the cardinality of a set can be an infinity. Being able to determine the size of a set is of great importance in understanding principles from discrete mathematics and finite mathematics, but other subjects as well, including advanced set theory and combinatorics.
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  • The cardinality of a set A, written as |A| or #(A), is the number of elements in A. Cardinality may be interpreted as "set size" or "the number of elements in a set". For example, given the set we can count the number of elements it contains, a total of six. Thus, the cardinality of the set A is 6, or . Since sets can be infinite, the cardinality of a set can be an infinity. Being able to determine the size of a set is of great importance in understanding principles from discrete mathematics and finite mathematics, but other subjects as well, including advanced set theory and combinatorics. One of the more advanced subjects is the determination of whether or not a particular set is countable or not. Some sets, even some sets containing an infinite number of elements, are countable (such as the set of integers) while other sets are not countable (such as the set of real numbers).
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