Axiom:Axiom of Infinity/Class Theory/Formulation 3
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- something rather amusing.
It would not normally be expected that this formulation be used as the basis of serious work in this field of mathematics.
- 2010: Raymond M. Smullyan and Melvin Fitting: Set Theory and the Continuum Problem (revised ed.) ... (previous) ... (next): Chapter $3$: The Natural Numbers: $\S 2$ Definition of the Natural Numbers