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 onetoone correspondence
with the set of natural numbers.
Note: The symbol aleph null (א_{0}) stands
for the cardinality of a countably infinite set.
See
also
Finite, infinite, uncountably
infinite, cardinal
numbers
