Wilhelm Friedrich Ackermann (March 29, 1896, Herscheid municipality, Germany - December 24, 1962 Lüdenscheid, Germany) was a German mathematician best known for the Ackermann function, an important example in the theory of computation. Ackermann was awarded the Ph.D. by the University of Goettingen in 1925 for his thesis "Begründung des "tertium non datur" mittels der Hilbertschen Theorie der Widerspruchsfreiheit", … Wikipedia
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Principles of Theoretical Logic is the 1950 American translation of the 1938 second edition of David Hilbert's and Wilhelm Ackermann's classic text Grundzge der theoretischen Logik, on elementary mathematical logic. 2place.org/wiki/Principles_of_Theoretical_Logic