دلیل افتراض: گزارش و سنجش

Among the most useful methods in traditional logic is Ecthesis (i.e. proof from supposition), on whose whatness and structure Muslim logicians disagree. On one hand, Suhrawardi and Fakhr ar-Razi consider it as a type of syllogism in the third figure, whereas on the other hand, Nasir-ad-din Tusi does not count it among syllogisms at all. The author in this essay firstly presents an account of three logicians’ viewpoints and then evaluates Nasir-ad-din Tusi’s opinions.  

Keywords:

دلیل افتراض , قیاس شکل سوم , سهروردی , فخر رازی , خواجه نصیر