A set of numbers usually refers to a group (set) of numbers with certain discreption or properties.
All odd numbers less than 10 is the set {1,3,5,7,9}
The set of numbers which solve the problem 3x^2 -7 = 68 is {5 and -5}
No, it is not.
Many infinite sets appear in mathematics: the set of counting numbers; the set of integers; the set of rational numbers; the set of irrational numbers; the set of real numbers; the set of complex numbers. Also, certain subsets of these, such as the set of square numbers, the set of prime numbers, and others.
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.
real numbers
In a certain sense, the set of complex numbers is "larger" than the set of real numbers, since the set of real numbers is a proper subset of it.
the set of real numbers
All of the natural numbers.
The set of integers, the set of rational numbers, the set of real numbers, the set of complex numbers, ...
The set of numbers which 3 does not belong is the set of even numbers.
This set of numbers is called "Whole Numbers".
The set of real numbers.
The sum of the set of numbers divided by the amount of numbers.