Allan Bäck, a professor of philosophy at Kutztown University, has written many articles and books on a variety of topics in the history and philosophy of logic, including ancient and Islamic philosophy. He has been awarded a Forschungspreis from the Alexander von Humboldt Stiftung (Senior Humboldt Research Prize) as well as an American Philosophical Association Fellowship for the Institute for Advanced Studies at Edinburgh University in recognition of his scholarly work. He has won the Wiesenberger award for teaching and the Chambliss prize for research at Kutztown University.

Table of Contents_____ Introduction IXPart One_____Of the third part of the first body [of teaching] in logic, in having ten chapters CHAPTER ONE_LANGUAGE, THOUGHT AND OBJECTS 25CHAPTER TWO_THE NAME 32CHAPTER THREE_THE VERB 43CHAPTER FOUR_THE MAs,.DAR 53CHAPTER FIVE_THE STATEMENT 55CHAPTER SIX_THE DENIAL OF THE STATEMENT 62CHAPTER SEVEN_PROPOSITIONS AND THEIR OPPOSITIONS 71 CHAPTER EIGHT_SINGULAR AND INDEFINITE PROPOSITIONS WITH QUANTIFIED PREDICATES 80CHAPTER NINE_TRUTH CONDITIONS FOR QUANTIFIED PROPOSITIONS WITH QUANTIFIED PREDICATSS 85PREDICATES 85CHAPTER TEN_THE PRINCIPLE OF NON-CONTRADICTION AND FUTURE CONTINGENT PROPOSITIONS 92Part Two_____Of the third field of the first body [of teaching] in logic CHAPTER ONE_CATEGORICAL PROPOSITIONS AND THEIR CONTRADICTORIES 103CHAPTER TWO_CATEGORICAL PROPOSITIONS AND THEIR CONTRADICTORIES (CONTINUED) 115CHAPTER THREE_PROPOSITIONS WITH COMPLEX PREDICATES 123CHAPTER FOUR_MODAL PROPOSITIONS 139CHAPTER FIVE_DEGREES OF OPPOSITION BETWEEN CATEGORICAL PROPOSITIONS 153GENERAL INDEX _163

AVICENNA (Ibn Sina) was and remains the preeminent Islamic philosopher. His works on science, metaphysics and medicine have had great influence on Islamic culture as well as on the West. Less known in the West are his logical works, as only his treatise on Porphyry's Isagoge was translated into Latin. A translation of Avicenna's "commentary" on Aristotle's On Interpretation, Al-'Ibara, is given here: the first in a Western language. Avicenna does not paraphrase the text but instead comments upon what the correct doctrines are. He offers original doctrines on such topics as predication, the logical square of opposition, and future contingents. Avicenna uses and refers to these doctrines in his scientific works. This translation will contribute to a better understanding of Avicenna's overall philosophy.