目次 0. はじめに 1. Ex Contradictione Quodlibet 2. Abelard's Embarrassing Argument from Opposites: The Inference Rules. 3. Abelard's Embarrassing Argument from Opposites: The Argument. 4. Alberic's Counterargument 5. The Proof of Ex Contradictione Quodlibet in the Middle Ages 6. まとめ 7. 補足 8. 付録 0. はじめに 今日…