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A set X is countable if and only if there is a bijection from X to the set of [[Natural Numbers]]. Countable sets include the set of [[integer]]s and the set of [[rational number]]s.
A set X is countable if and only if there is a bijection from X to the set of [[Natural Numbers]]. Countable sets include the set of [[integer]]s and the set of [[rational number]]s.
[[Category: Mathematics]]
[[Category:Set theory]]