Abstract
In the absence of the axiom of choice it is sometimes, but not always, possible to define the notion of cardinal number such that for anyx, x ≈ |x|.
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Pincus, D. Cardinal representatives. Israel J. Math. 18, 321–344 (1974). https://doi.org/10.1007/BF02760841
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DOI: https://doi.org/10.1007/BF02760841