1,237
edits
Changes
Jump to navigation
Jump to search
mLine 1:
Line 1: − +
bold title, nicifying link, +links
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|natural numbers]]. Countable sets include the set of [[integer]]s and the set of [[rational number]]s.
[[Category:Set theory]]
[[Category:Set theory]]