Last modified on 26 June 2014, at 06:21

aleph-null

EnglishEdit

Proper nounEdit

aleph-null

  1. (set theory) The first of the transfinite cardinal numbers; corresponds to the number of positive integers, also called natural numbers. Georg Cantor showed that even all the rational numbers could be put in one-to-one correspondence with them, and are therefore countable, enumerable or denumerable.

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