Early Arabic logicians on the contraposition of the particular affirmative

This paper is a narrative of the fate of I-contraposition in the early Arabic logic. I will study Avicenna’s, al-Suhrawardī’s, al-Rāzī’s, al-Kashshī’s, and al-Khūnajī’s views on this rule. Although Avicenna explicitly acknowledged I-contraposition in a brief note, and in an apparently Meinongian language, the other four figures found I-contraposition problematic and listed some counterexamples to it. Nonetheless, they all attempted to justify Avicenna’s acceptance of the rule by restricting its application conditions. These efforts led to interesting syntactic and semantic analyses but gathered little attention from later medieval logicians. Finally, in the middle Arabic logic, the revised versions of I-contraposition were also declared invalid

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• Propositions with Negative Predicates in Arabic Logic

  Open Access•Yusuf Daşdemir•History and Philosophy of Logic•2026

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