(thing) by brad Sat Nov 13 1999 at 9:05:44

The first letter of the Hebrew alphabet: א

Also used with a subscript to represent the various orders of infinity.
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(thing) by ariels Fri Jul 14 2000 at 9:58:53

(Set Theory:)

Aleph (ℵ), unadorned with subscripts, is the common symbol for the cardinality of the continuum.

2ℵ0 = ℵ

With subscript 0, ℵ0 (aleph-null) is the cardinality of the integers. With successive (ordinal) subscripts, ℵz is the z'th cardinal after ℵ0. The Continuum Hypothesis (CH) is that ℵ = ℵ1.

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