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Line 1: − #REDIRECT [[Counting numbers]]+ + + + + + + + + +
It was a redirect, now it's a (sourced) article
In [[mathematics]], a '''cardinal number''' is a set that represents a generalization of the number of elements of the set.
In [[set theory]], the usual [[counting numbers]] are represented by sets.
For example, ''10'' is a set. There are many ways to represent ''10'' as a set, but the most widespread <ref>[http://planetmath.org/encyclopedia/VonNeumannInteger.html Von Neumann Integers], ''site'' planetmath.org</ref>, but the reverse is not true</ref> takes ''10 = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }''.
== References ==
<references />
[[Category:Mathematics]]