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Ackermann with suit and tie

Wilhelm Ackermann
Zum Hilbertschen Aufbau der reellen Zahlen (1928)
Mathematische Annalen 99, p.118-133
On Hilbert's construction of the real numbers
Jean van Heijenoort, From Frege to Gödel, p.493-507
translation: S. Bauer-Mengelberg, IBM, Springer Verlag
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