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Wilhelm Ackermann. Widerspruchsfreier Aufbau einer typenfreien Logik. (Erweitertes System). Mathematische Zeitschrift, vol. 55 (1952), pp. 364–384. - Wilhelm Ackermann. Widerspruchsfreier Aufbau einer typenfreien Logik. II. Mathematische Zeitschrift, vol. 57 (1953), pp. 155–166.
Published online by Cambridge University Press: 12 March 2014
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- Copyright © Association for Symbolic Logic 1954