"... wir nennen die ihr zukommende Cardinalzahl 'Alef-null', in Zeichen 0 ... ... we call the cardinal number related to that 'Aleph-null', in symbol, 0 ..."
— Aleph number

January 1, 1970

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Original Language: English

Sources

Georg Cantor: Contributions to the Foundation of Transfinite Set Theory (Beiträge zur Begründung der transfiniten Mengenlehre). In Mathematische Annalen, Band XLVI (vol. 46), B. G. Teubner, Leipzig, 1895.