Document Type : Extension

Author

• saeed Anvari

Associate Professor, Department of Philosophy, Allameh Tabatabaei University

Abstract

Medieval logicians chose acronyms for valid syllogism moods. These names were chosen in such a way as to determine the type of propositions used in the minor and major premises and the result of the syllogism. Moreover, it showed how the valid moods of the second to fourth figure return to the moods of the first figure and the method of rejecting and converting the valid moods of those figures to the first figure. The vowels used in this name indicate the type of proposition. For example, the name of the first mood of the analogy is Barbara. The vowels used in this acronym indicate the type of proposition enclosed in the premises and the conclusion of these moods of syllogism. In this article, these acronyms and their related points are explained. Also, the reason for the difference of these names is stated in the fourth figure, And the history of the changes of these names is mentioned in the fourth figure. Finally, a comparison between this method and the method of using the general rules of inference by Muslim logicians has been made, And the advantages and disadvantages of each of these two methods are stated.

Keywords

• Syllogism
• Valid moods
• Medieval logicians
• History of logic