Axiom:Axiom of Infinity/Class Theory/Formulation 3/Historical Note
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Historical Note on Formulation 3 of the Axiom of Infinity (Class Theory)
Raymond M. Smullyan and Melvin Fitting introduce this formulation of the Axiom of Infinity in their Set Theory and the Continuum Problem, Revised ed. of $2010$ as:
- 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.
Sources
- 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