A mathematical symbol representing the cardinality of countably infinite sets, such as the set of all natural numbers.
Combines 'aleph' (Hebrew letter) with 'zero' (from Arabic 'ṣifr'). Mathematician Georg Cantor coined this notation in the 19th century to describe the smallest infinite cardinal number.
Aleph-zero is mind-bending: there are aleph-zero even numbers, aleph-zero odd numbers, yet still only aleph-zero total numbers—infinity behaves weirdly!
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