substance "and its development in avicenna`s philosophy

one of the important philosophical issues and debates dating back over two thousand years, and the beginning of wisdom in ancient greece has been proposed, is the problem of essence. some believe that the discussion on the issue of substance is aristotelian thought, and believe that the roots of this attribution in aristotle approach to the existence and its relation with the essence and nature of things. because based on aristotelian thought, recognition of existence is nothing but nature and essence of objects.therefore, according to the first teacher, words of existence and essence are synonymous. but fate of substance in avicenna`s philosophy has been changed by the distinction made between existence and essence; it, therefore, has separated its way from existence.unlike aristotle, avicenna has considered the divider of substance and accident as essence of things and has adapted aristotelian categories on the essence of the objects. this writing, considering importance of the position of substance issue in ibn sina's thought and his historical evolution in philosophy, discusses about dimensions and different angles of this category with the problem-oriented approach in avicenna wisdom. therefore, according to a lack of consensus on the definition and because of semantic variations course, it is clear that the quiddity and epistemic evolution of substance, explanation of essence and accidents divider, manner of divisions exclusiveness, ibn sina's specific viewpoint on substantiality of transcendental necessary being are the main issues that will be researched in this article.