Up to 2012, my most significant work has been in the field of philosophical logic, more precisely in temporal and epistemic logic. My doctoral thesis provides a unified approach to two important paradoxes in these areas: the Knowability Paradox (or Fitch-Church Paradox) and the Future Contingents' problem. My most relevant contributions in this area are:

a) an intuitionistic solution of the Knowability Paradox together with an original semantic for intuitionistic epistemic logic (Journal of Philosophical Logic, 2012).

b) an analysis and solution of the Knowability Paradox in quantified modal logic (Erkenntniss, 2016).

During my first postdoctoral experience at Lund University I expanded my research interests and activity over problems of collective rationality, at the bridge with social psychology and behavioral economics. My first work in this area focused on the formal study of phenomena of “irrational” group behavior such as pluralistic ignorance and informational cascades. A joint work with Prof. Erik Olsson was the first to provide a formal characterization and a logical model of pluralistic ignorance. We show that such phenomenon can arise, and be quite robust, even among artificial agents that reason according to norms of logical rationality (Journal of Philosophical Logic).

I am currently running a new research project on “Rationality and Group Behavior” (funded by the Swedish Riksbanken Jubileumsfond, 2017-2020), which expands my work on collective rationality along two further lines. The first one investigates the role of social norms in holding groups of rational agents together. In a recent paper - based on a game theoretic approach implemented in a multi-agent simulation - I show that there are cases where pro-social behavior within a community can cause inefficiencies, low quality, and detrimental collective outcomes (Proietti and Franco, Journal of Artificial Societies and Social Simulation, forthcoming in February 2018). A further line of research has its focus on the study of group polarization with methods of abstract argumentation. This research builds upon a formal approach to the problem via argumentation frameworks and methods from dynamic logic. Initial work on this topic has been published in the proceedings of international conferences in Argumentation Theory and Logical Foundations of Rational Interaction. 

My research interests and publications are in

- Epistemic Logic and its applications
- Logic and Philosophy of Time
- Argumentation Theory
- Agent Based Modeling and computer simulations of Artificial Societies

Editorships (1)

• Proietti, C. & Zenker, F. (2014). (Eds.) Social dynamics and collective rationality (special issue of the journal Synthese). Synthese, 191(11). Springer.

Articles (11)

• Proietti, C. & Ciuni, R. (accepted/in press). The Abundance of the Future. A paraconsistent approach to Future Contingents. Logic and Logical Philosophy, 22, 21-43. Nicolaus Copernicus University.
• Proietti, C. & Smid, J. (2019). Mereology and time travel. Philosophical Studies. Springer Netherlands.
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• Proietti, C. & Franco, A. (2018). Social Norms and the Dominance of Low-Doers. Journal of Artificial Societies and Social Simulation, 21. University of Surrey.
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• Proietti, C. (2017). Polarization and bipolar probabilistic argumentation frameworks. CEUR Workshop Proceedings, 2012, 22-27. CEUR Workshop Proceedings.
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• Christoff, Z., Hansen, J. U. & Proietti, C. (2016). Reflecting on Social Influence in Networks. Journal of Logic, Language and Information, 25, 299-333. Springer Netherlands.
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• Proietti, C. (2016). The Fitch-Church Paradox and First Order Modal Logic. Erkenntnis, 81, 87-104. Springer.
• Ciuni, R. & Proietti, C. (2014). Arthur Prior. APhEx, Portale italiano di Filosofia Analitica, 10, 375-413.
• Proietti, C. & Olsson, E. J. (2014). A DDL Approach to Pluralistic Ignorance and Collective Belief. Journal of Philosophical Logic, 43, 499-515. Springer.
• Proietti, C. (2012). Intuitionistic epistemic logic, Kripke models and Fitch's paradox. Journal of Philosophical Logic, 41, 877-900. Springer.
• Proietti, C. & Sandu, G. (2010). Fitch's paradox and ceteris paribus modalities. Synthese, 173, 75-87. Springer.
• Proietti, C. (2008). Natural numbers and infinitesimals: a discussion between Benno Kerry and Georg Cantor. History and Philosophy of Logic, 29, 343-359. Taylor & Francis.

Book chapters (6)

• Proietti, C., Sandu, G. & Rivenc, F. (accepted/in press). Bivalence and future contingency. Springer.
• Ciuni, R. & Proietti, C. (2019). Future contingents, Supervaluationism, and relative truth. In Bellotti, L., Gili, L., Moriconi, E. & Turbanti, G. (Eds.) Analitica (pp. 69-88). Edizioni E.T.S..
• Proietti, C. (2017). Time of Logics and Time of Physics. In Bouton, C. & Huneman, P. (Eds.) Boston Studies in the Philosophy and History of Science (pp. 39-53), 326. Springer Verlag.
• Olsson, E. J. & Proietti, C. (2016). Explicating Ignorance and Doubt : A Possible Worlds Approach. In Peels, R. & Blaauw, M. (Eds.) (pp. 81-95). Cambridge University Press.
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• Proietti, C. (2010). Carnap e il convenzionalismo semantico. In Bellotti, L. & Paoletti, G. (Eds.) (pp. 127-141). ETS, Pisa.
• Proietti, C. (2009). Ceteris paribus modalities and the future contingents problem. In Kurzen, L. & Velasquez Quesada, F. (Eds.) (pp. 304-325). Institute for Logic, Language and Computation, Universiteit van Amsterdam.

Conference contributions (6)

• Proietti, C. & Ciuni, R. (accepted/in press). Probabilistic Semantics for a Discussive Temporal Logic. College Publications.
• Proietti, C. (2017). The dynamics of group polarization. Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 10445 LNCS, 195-208. Springer Verlag.
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• Proietti, C. (2016). Understanding Group Polarization with Bipolar Argumentation Frameworks. In Baroni, P., Gordon, T. F., Scheffler, T. & Stede, M. (Eds.) Frontiers in Artificial Intelligence and Applications (pp. 41-52), 287. IOS Press.
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• Christoff, Z., Hansen, J. U. & Proietti, C. (2014). Reflecting on social influence in networks.
• Proietti, C. (2013). Comments to "Knowledge, friendship and social announcements". College Publications.
• Proietti, C. (2010). The Kerry-Frege debate about object and concept: some remarks on Kerry’s position. In Marletti, C. (Ed.) (pp. 96-104), 3. ETS.

Working papers (1)

• Olsson, E. J. & Proietti, C. (2015). Promoting the best as an incentive : reply to Pluchino et al. on the Peter Principle.
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Reviews (1)

• Proietti, C. (2012). Claude Gratton, Infinite Regress Arguments. Cogency - Journal of Reasoning and Argumentation, 4, 213-215. Department of Psychology, Lund University.