countably infinite

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

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