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mathematics A term describing a set which is isomorphic
to a subet of the natural numbers. A countable set has
"countably many" elements. If the isomorphism is stated
explicitly then the set is called "a counted set" or "an
enumeration".
Examples of countable sets are any finite set, the naturalnumbers, integers, and rational numbers. The realnumbers and complex numbers are not [proof?].
(1999-08-29)
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