aleph-null

[ ah-lif-nuhl ]
/ ˈɑ lɪfˈnʌl /

noun Mathematics.

the cardinal number of the set of all positive integers; the smallest transfinite cardinal number.
Also called a·leph-ze·ro [ah-lif-zeer-oh] /ˈɑ lɪfˈzɪər oʊ/.

Origin of aleph-null

First recorded in 1905–10

British Dictionary definitions for aleph-null

aleph-null

aleph-zero


noun

the smallest infinite cardinal number; the cardinal number of the set of positive integers Symbol: א 0

Scientific definitions for aleph-null

aleph-null
[ ä′lĕf-nŭl ]

The first of the transfinite cardinal numbers, corresponding to the number of elements in the set of positive integers.