Abstract

Ibn sina has many works in logic. Comparative study of these works shows two kinds of evolution in his logical thinking: evolution in problem creating, conceptualization, theorizing, and evolution in logical writing. The subject of the present paper is to study the latter kind. Ibn Sina managed to organize the juxtaposed treatises, which were inherited from Greeks into a cognitive coherent system and with logical order. Gradually this structural evolution along with corrective and complementary orientation from Shifa to Isharat and in the course of writing more than fifteen treatises has taken place. Writers on logic in Islamic period after Ibn Sina have taken some of Ibn sina's works, in particular Shifa and Isharat as a model for writing their logical works. Meanwhile Isharat has become a starting-point for a new school in logic. In this survey of structural evolution in Ibn Sina's logical works topics such as terms, categories, definition, and conversion will be treated. This study provides a context for hypothesis making in historical arrangement of Ibn sina's works.