Abstract

Avicenna is undoubtedly one of the outstanding scientists and perhaps the most prominent one in the history of Islamic-Iranian civilization. After a lifetime of trying to describe, explain and complete the Greek intellectual heritage, Avicenna admitted to have achieved a realm of philosophy which he construed as "oriental philosophy''. Avicenna's oriental logic can be defined and explained according to the very oriental philosophy in terms of method and content. The issue is what the characteristics of this oriental philosophy and particularly, oriental logic is. Since there is not direct and abundant evidence in "surface" as documents, we try to reach the conclusion by a range of indirect and limited evidences in "depth". In this paper, two different and yet consistent features of Avicenna's oriental logic are inferenced and introduced. In the first sense, oriental logic can refer to a range of "non-Aristotelian innovative and established systems" in the East, and in the second aspect, it can be an oriental horizon and dawn to establish a "fuzzy logic" which is considered today multi-valued and infinite-valued logic.