Himpunan terhitung

Dalam matematik, set boleh dikira jika ia mempunyai kardinaliti yang sama ( bilangan unsur set) dengan beberapa subset set nombor asli N = {0, 1, 2, 3, ...}. Setara, set S boleh dikira jika wujud fungsi injektif f : S → N dari S ke N ; ia hanya bermaksud bahawa setiap elemen dalam S sepadan dengan elemen yang berbeza dalam N.

Rujukan

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• Kamke, Erich (1950), Theory of Sets, Dover series in mathematics and physics, New York: Dover, ISBN 978-0486601410
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• Tao, Terence (2016). "Infinite sets". Analysis I (dalam bahasa Inggeris) (ed. Third). Singapore: Springer. m/s. 181–210. ISBN 978-981-10-1789-6.