Countably Infinite

Describes a set which contains the same number of elements as the set of natural numbers. Formally, a countably infinite set can have its elements put into one-to-one correspondence with the set of natural numbers.

Note: The symbol aleph null (א‎₀) stands for the cardinality of a countably infinite set.

 

 

See also

Finite, infinite, uncountably infinite, cardinal numbers