Ideas from 'On the Introduction of Transfinite Numbers' by John von Neumann [1923], by Theme Structure

[found in 'From Frege to Gödel 1879-1931' (ed/tr Heijenoort,Jean van) [Harvard 1967,0-674-32449-8]].

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6. Mathematics / B. Foundations for Mathematics / 4. Definitions of Number / g. Von Neumann numbers
Each Von Neumann ordinal number is the set of its predecessors