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<*mathematics*> The number of elements in a set. If two sets
have the same number of elements (i.e. there is a bijection
between them) then they have the same cardinality. A
cardinality is thus an isomorphism class in the category
of sets.

aleph 0 is defined as the cardinality of the first infinite ordinal, omega (the number of natural numbers).

(1995-03-29)

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