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Published online by Cambridge University Press: 27 June 2016
1 This paper first appeared in the Mathematische Zeitschrift m v. 39 (1935), pp. 176-221. Its English translation by Manfred Szabo appeared in the American Philosophical Quarterly in v. 1 (1964) and in The Collected Papers of Gerhard Gentzen, edited by Szabo, Manfred (Amsterdam: North Holland, 1969)Google Scholar.