A set is a collection of entities, called elements of the set, that may be real objects or conceptual entities.

The empty (or void, or null) set, which is usually symbolized by Ø, contains no elements.

If all elements and sets are contained in one big set, it is called the universal set. All sets included in this set are called subsets of the universal set.

Set theory not only is involved in many areas of mathematics but has important applications in other fields as well, such as computer technology and atomic and nuclear physics.

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