Ideas from 'Proof that every set can be well-ordered' by Ernst Zermelo [1904], 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 / A. Nature of Mathematics / 5. The Infinite / e. Countable infinity