DE RE AND DE DICTO MODALITY IN ISLAMIC TRADITIONAL LOGIC

Abstract

In Islamic traditional textbooks modal operators sometimes come before propositions, sometimes before the predicates and sometimes at the end of propositions. This makes the interpretation of modality in each case as de re or de dicto difficult. Given Ibn SςnΪ's discussion of and sensitivity to this distinction, in this paper by examining the position of modality in the contradictories and converses of modal categorical propositions as well as their positions in modal syllogisms I will try to find a reasonable answer to this important issue. Key Terms: Ibn SςnΪ, Khūnajς, modality de re, modality de dicto, traditional logic, conversion, syllogism, contradiction.

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