# Aleph-zero

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2010 Mathematics Subject Classification: Primary: 03E10 [MSN][ZBL]

A cardinal number which is the cardinality of all countably-infinite sets (cf Countable set). Denoted by \$\aleph_0\$.

How to Cite This Entry:
Aleph-zero. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Aleph-zero&oldid=35818
This article was adapted from an original article by P.S. Aleksandrov (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article