Vasilis Politis is Head of Philosophy and Director of the Plato Centre at Trinity College Dublin. He is co-editor of The Aporetic Tradition in Ancient Philosophy (with Giorgos Karamanolis, Cambridge, 2017), and has published numerous essays in journals including Phronesis.

• Introduction; Part I. The Issue of the Justification of Plato's Essentialism: 1. The raising of the ti esti question; 2. How to answer the ti esti question; 3. The thesis of the priority of definition; Part II. The Role of Aporia and the Root of Plato's Essentialism: 4. What are Plato's early dialogues about?; 5. Whether-or-not questions and agonistic argument; 6. Whether-or-not questions and the articulation of aporiai; 7. Aporia-based enquiry aiming at knowledge; 8. What is behind the ti esti question?; Bibliography; General index; Index of passages cited.

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Vasilis Politis is Head of Philosophy and Director of the Plato Centre at Trinity College Dublin. He is co-editor of The Aporetic Tradition in Ancient Philosophy (with Giorgos Karamanolis, Cambridge, 2017), and has published numerous essays in journals including Phronesis.

• Introduction; Part I. The Issue of the Justification of Plato's Essentialism: 1. The raising of the ti esti question; 2. How to answer the ti esti question; 3. The thesis of the priority of definition; Part II. The Role of Aporia and the Root of Plato's Essentialism: 4. What are Plato's early dialogues about?; 5. Whether-or-not questions and agonistic argument; 6. Whether-or-not questions and the articulation of aporiai; 7. Aporia-based enquiry aiming at knowledge; 8. What is behind the ti esti question?; Bibliography; General index; Index of passages cited.

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Vasilis Politis is Head of Philosophy and Director of the Plato Centre at Trinity College Dublin. He is co-editor of The Aporetic Tradition in Ancient Philosophy (with Giorgos Karamanolis, Cambridge, 2017), and has published numerous essays in journals including Phronesis.

• Introduction; Part I. The Issue of the Justification of Plato's Essentialism: 1. The raising of the ti esti question; 2. How to answer the ti esti question; 3. The thesis of the priority of definition; Part II. The Role of Aporia and the Root of Plato's Essentialism: 4. What are Plato's early dialogues about?; 5. Whether-or-not questions and agonistic argument; 6. Whether-or-not questions and the articulation of aporiai; 7. Aporia-based enquiry aiming at knowledge; 8. What is behind the ti esti question?; Bibliography; General index; Index of passages cited.

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