Because its still a set, although its empty or nothing in that set
{} {0}
* * * * *
The second example above is NOT of an empty set: it is the set that contains the number zero.
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An empty set in math is called a null set.
An empty set is a set with no elements. It can be symbolized by {} or ø. The solution set for an equation that has no solution is also called an empty set.
Null Set is also called Void Set. Some books have even called it Empty Set.
Yes,an empty set is the subset of every set. The subset of an empty set is only an empty set itself.
It is usually called impossible; some call it the empty set.