Any well-defined set of numbers.
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a set
order pair
The derived set of a set of rational numbers is the set of all limit points of the original set. In other words, it includes all real numbers that can be approached arbitrarily closely by elements of the set. Since the rational numbers are dense in the real numbers, the derived set of a set of rational numbers is the set of all real numbers.
The set of numbers which 3 does not belong is the set of even numbers.
The set of even numbers is the set of all the numbers that are divisible by 2 (or multiples of 2).