The set of whole numbers.
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There is only one null set. It is 'the' null set. It is a set which does not contain any numbers.
A null set is a set that does not contain any elements, an empty set.
There is only one null set. It is 'the' null set. It is a set which does not contain any numbers. It is represented by the symbol ∅.
The set of all rational numbers.If the set contains all of them then no other set can contain any more rational numbers.
Assume that set A is a subset of set B. If sets A and B are equal (they contain the same elements), then A is NOT a proper subset of B, otherwise, it is.