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date: 14 December 2019

Abstract and Keywords

The Epistle for Shams al-Din on the Rules of Logic is a much-studied textbook written by Najm al-Din al-Kātibī (d. 1277). It is a compact and difficult treatment of logic that concentrates above all on modal syllogistic, though it touches on all the major topics covered in the Arabic logical tradition. It reflects the results of the further development of Avicenna’s project of modifying Aristotelian logic, a project that attracted enormous attention through the thirteenth century. The Shamsiyya, as the epistle is commonly referred to, was initially received with some hostility, but came to be accorded a central place in the madrasa curriculum in the fourteenth century, in large part because of the commentary on it written by Qutb al-Din al-Razi (d. 1365).

Keywords: syllogism, modal logic, conditionals, medieval science, textbook, Marāgha

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