Question

Define empty set with example.​

Answer 1

Empty Set

In mathematics, the empty set is the unique set having no elements; its size or cardinality is zero. Some axiomatic set theories ensure that the empty set exists by including an axiom of empty set, while in other theories, its existence can be deduced.

----------------------------------------------------------------------:-)

Answer 2

Answer:

In mathematics, the empty set is the unique set having no elements; its size or cardinality is zero. Some axiomatic set theories ensure that the empty set exists by including an axiom of empty set, while in other theories, its existence can be deduced. 

Examples of empty sets include: The set of real numbers x such that x2 + 5, The number of dogs sitting the PSAT.