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In [[set theory]], the usual [[counting numbers]] are represented by sets.

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 }''.

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> takes ''10 = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }''.

== References ==

== References ==