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Wilhelm Ackermann. Widerspruchsfreier Aufbau der Logik I. Typenfreies System ohne tertium non datur. The journal of symbolic logic, vol. 15 (1950), pp. 33–57.
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- Journal:
- The Journal of Symbolic Logic / Volume 16 / Issue 1 / March 1951
- Published online by Cambridge University Press:
- 12 March 2014, p. 72
- Print publication:
- March 1951
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- Article
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