Table of Contents

1. Introduction.- 2. Sources.- 3. Background.- 4. Fundamental Ideas.- 5. Basic Modal Relations.- 6. Enumeration of Modal Propositions - I: Simple Modalities.- 7. Enumeration of Modal Propositions - II: Compound Modalities.- 8. Rules for Contradictories.- 9. Conversion (i.e., Simple Conversion).- 10. C-Conversion (Conversion by Contradiction).- 11. Modal Syllogisms.- 12. Avicenna as the Source of al-Qazw?n? al-K?tib?’s Logic of Modality.- 13. Temporal Modalities Among the Ancient Greeks and the Latin Medievals.- 14. Conclusion.- Appendix B/A Fragment of Galen’s Lost Treatise “On Possibility”.- Index of Names.