Abstract
We say: There is never a syllogism from two real separative premisses. For the statement ‘It is exclusively either A is B or C is D’ is true only if it has no third part. What is meant by saying ‘It is exclusively either A is B or C is D’ is the following: ‘A is B, and if not, then it is necessary that C is D’. If it is not the case that ‘C is D’, then the statement will be false. Except, as we said before 1, when you turn it into a particular proposition; for in this case it should not take a third part. We shall prove that there is no syllogism from two affirmative premisses one of which is a particular premiss.
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Notes
See 288.
245, 9-17 and 246, 1-5.
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© 1973 D. Reidel Publishing Company Dordrecht, Holland
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Shehaby, N. (1973). On the Syllogisms Compounded of Separative Propositions. In: The Propositional Logic of Avicenna. Synthese Historical Library, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2624-6_9
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DOI: https://doi.org/10.1007/978-94-010-2624-6_9
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