## countable setA countable set is a set that is either finite or countably
infinite. A countably infinite set is one that can be put in one-to-one correspondence with the natural numbers and thus has a cardinal number ("size")
of aleph-null. Examples of countable sets
include the set of all people on Earth and the set of all fractions. ## Related entry• infinity## Related category• SETS AND SET THEORY | |||||

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