: Mathématiques: set-theoretic definition of natural numbers

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set-theoretic definition of natural numbers

In set theory, several ways have been proposed to construct the natural numbers. These include the representation via von Neumann ordinals, commonly employed in axiomatic set theory, and a system based on equinumerosity that was proposed by Gottlob Frege and by Bertrand Russell.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Set-theoretic_definition_of_natural_numbers)

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