A set can contain anything, or in some cases, nothing. Real numbers are an important and useful mathematical concept, and they are among the things that could be placed in various sets for various purposes.
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is a set of real numbers with the property that any number that lies between two numbers is the set.
The relation, between two sets of objects, is a mapping which associates elements of the first set to those of the second set.
If the universal set, U, has N elements then it has 2N subsets.
-5 to a set number is -5
not a real number * * * * * Zero is very much a real number. In fact it is the additive identity for the set of real numbers.