There are three conditions for a set.
1- The elements should be well-defined.
2- They should not be repeated.
3- They should be in ascending order.
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An empty set in math is called a null set.
The null set is a set which has no members. It is an empty set.
It is a set that is well defined.
It is the set of "everything".
A collection of distinct entities regarded as a unit, being either individually specified or (more usually) satisfying specified conditions.