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Ḟrederic B. Fitch. Natural deduction rules for obligation. American philosophical quarterly, vol. 3 (1966), pp. 27–38.
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Ḟrederic B. Fitch. Natural deduction rules for obligation. American philosophical quarterly, vol. 3 (1966), pp. 27–38.
Published online by Cambridge University Press: 12 March 2014
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- Copyright © Association for Symbolic Logic 1968