Avicenna and Tusi on the Contradiction and Conversion of the Absolute

History and Philosophy of Logic 21 (1):45-56 (2000)
Avicenna (d. 1037) and T?s? (d. 1274) have different doctrines on the contradiction and conversion of the absolute proposition. Following Avicenna's presentation of the doctrine in Pointers and reminders, and comparing it with what is given in T?s?'s commentary, allow us to pinpoint a major reason why Avicenna and T?s? have different treatments of the modal syllogistic. Further comparison shows that the syllogistic system Rescher described in his research on Arabic logic more nearly fits T?s? than Avicenna. This in turn has consequences for analysing Avicenna's logic, and for writing the history of a fascinating period of change and diversity in the discipline in the medieval Islamic world
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DOI 10.1080/01445340050044637
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Henrik Lagerlund (2009). Avicenna and Ūsī on Modal Logic. History and Philosophy of Logic 30 (3):227-239.

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