A very useful concept in mathematics is the idea of the set. A set is essentially a collection of items. Here are some examples of sets:
Set is a set of the first three natural numbers, set is a set of fruits, and set is a set of mathematical functions.
It is often useful to perform operations on sets to compare them.
The intersection of two sets is a new set that contains elements that are only in both sets. This is denoted using the symbol. For example,
The union of two sets is a new set that contains elements that are in either set. This is denoted using the symbol. For example,