Avicenna's Creations in Logic and its Influence on Aristotlian Logic

The base of Aristotle's logics was so strong that for several centuries after him, most of the scholars considered it perfect from different aspects and it governed thoughts and views of other thinkers. Avicenna was the first one who swerved from Aristotle’s style in the forming of logics and changed Aristotlian logic from different aspects. Avicenna, besides diminishing some logical issues such as categories, full argument about poetry, rhetoric and dialectic, replaced some issues for example conversion, definition and description and introduced numerous creations in logic science as fallows:1- Changing the logic of nine parts to the logic of to parts.2- Division of conventional literal signifying to three parts, correspondence and implication and commitment.3- Extension and expansion the division of propositions by considering modality and their special order and modern flowing.4- Possibility of the consistency of two absolute propositions with difference in quantity and quality.5- Proportion between definition and essence of definiendum and diminishing of abbreviation order in real definition.6- Needing not the definition and difficulty of procurability to real definition of things.7- Hypotetical attributive syllogism and its different kinds.8- Actual ascertainment addressed attribute for subjects essence in subject fetter.9- Reflexiveness of affirmative necessory proposition in the form of general absolute particular affirmative proposition.