The logic of the Easterners

In this book, Ibn Sina explains the latest conclusions he reached regarding definitions of logic, its principles, and issues. Ibn Sina critically examines the logic of Greek philosophers with complete neutrality, mentioning their strengths and weaknesses, in simple language and straightforward style. The book also includes poems by Ibn Sina that embody his philosophy of life and his view of old age, wisdom, and asceticism, and his poems are crowned by the "double" poem, which every student of logic is advised to memorize for its summary of the great philosopher's achievements. One of the features of this book is that Ibn Sina composed it in his later years, after he had abandoned research and study in this field; therefore, it is considered the most important among his other writings on logic.