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set

A well-defined collection of distinct objects (its elements).

A set is a well-defined collection of distinct objects, called its elements or members, typically written by listing them inside curly braces: A = \{1, 2, 3\}.

Examples

  • \{1, 2, 3\} is the set containing the numbers 1, 2, and 3.

  • The empty set \varnothing is the set with no elements at all.

See also

element of subset
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