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Chair of Philosophy I – Prof. Dr. Olivier Roy

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Olivier Roy Prof. Dr. Olivier Roy
Olivier Roy

Faculty of Cultural Studies
Chair of Philosophy I

I am Professor of Philosophy and joined the Department at the start of the Winter Semester 2013-14. I am also external member of the Munich Center for Mathematical Philosophy, where I worked for two years as assistant professor. Before that I worked at the Rijksuniversiteit Groningen in the Faculty of Philosophy. I have completed my PhD in February 2008 at the Institute for Logic, Language and Computation in Amsterdam, under the supervision of Johan van Benthem (Amsterdam and Stanford) and Martin van Hees (Groningen). I am associate editor of TopoiTheory and Decision Library Series A, and Section Editor for the "Logic, Computation and Agency" Section of the Stanford Encyclopedia of Philosophy (the latter together with Eric Pacuit and Johan van Benthem). From 2011 to 2020 I have also been associate editor of  Erkenntnis.

Areas of expertise

I study questions of rationality in strategic interaction, learning and belief revision in social network, structure and justification of norms, and the philosophy of shared agency. For this I use methods from logic, computer science, and decision and game theory.


For my current and past courses, please see the P&E intranet.


  • Head of Department
  • Coordinator: Philosophy & Economics Programme
  • Chair of Exam Board: Philosophy & Economics (BA)
Olivier Roy

Faculty of Cultural Studies
Chair of Philosophy I



Roy, Olivier; Rafiee Rad, Soroush
Deliberation, Single-Peakedness, and Coherent Aggregation
in American Political Science Review (2020)


Roy, Olivier; Dong, Huimin; Gratzl, Norbert
Open Reading and Free Choice Permission : A Perspective in Substructural Logics
In: Liao, Beishui(ed.): Dynamics, Uncertainty and Reasoning - Singapore: Springer, 2019 (Logic in Asia)

Roy, Olivier; Schwenkenbecher, Anne
Shared Intentions, Loose Groups, and Pooled knowledge
in Synthese (2019) . - pp. 1-19
doi:10.1007/s11229-019-02355-x ...


Romeijn, Jan-Willem; Roy, Olivier
All Agreed : Aumann meets DeGroot
in Theory and Decision vol. 85 (2018) issue 1. - pp. 41-60
doi:10.1007/s11238-017-9633-9 ...


Dong, Huimin; Roy, Olivier
Dynamic Logic of Power and Immunity
In: Baltag, Alexandru ; Seligman, Jeremy ; Yamada, Tomoyuki(ed.): Logic, Rationality, and Interaction : 6th International Workshop, LORI 2017, Sapporo, Japan, September 11-14, 2017, Proceedings - Berlin, Heidelberg: Springer, 2017. - pp. 123-136 . - (Lecture Notes in Computer Science; 10455)
doi:10.1007/978-3-662-55665-8_9 ...

Klein, Dominik; Roy, Olivier; Gratzl, Norbert
Knowledge, belief, normality, and introspection
in Synthese (2017) . - pp. 1-30
doi:10.1007/s11229-017-1353-8 ...

Shi, Chenwei; Roy, Olivier
Reason to Believe
In: Baltag, Alexandru ; Seligman, Jeremy ; Yamada, Tomoyuki(ed.): Logic, Rationality, and Interaction - Berlin: Springer, 2017. - pp. 676-680 . - (Lecture Notes in Computer Science; 10455)
doi:10.1007/978-3-662-55665-8_51 ...


Deontic Logic and Normative Systems
publ: Roy, Olivier; Tamminga, Allard; Willer, Malte
London : College Publications, 2016

Pacuit, Eric; Roy, Olivier
A Dynamic Analysis of Interactive Rationality
In: Redmond, Juan ; Pombo Martins, Olga ; Nepomuceno Fernández, Ángel(ed.): Epistemology, Knowledge and the Impact of Interaction - Cham: Springer, 2016. - pp. 187-206 . - (Logic, Epistemology, and the Unity of Science; 38)
doi:10.1007/978-3-319-26506-3_6 ...

Roy, Olivier; Hjortland, Ole Thomassen
Dynamic consequence for soft information
in Journal of Logic and Computation vol. 26 (2016) issue 6. - pp. 1843-1864
doi:10.1093/logcom/exu040 ...

Pacuit, Eric; Roy, Olivier
Epistemic Foundations of Game Theory
Stanford Encyclopedia of Philosophy - Stanford, Calif.: The Metaphysics Research Lab, Stanford Univ., 2016
http://plato.stanford.edu/archives/spr2016/entries ...


Romeijn, Jan-Willem; Roy, Olivier
Individual and Social Deliberation : Introduction
in Economics & Philosophy vol. 31 (2015) issue 1. - pp. 1-2
https://www.cambridge.org/core/services/aop-cambri ...

Grossi, Davide; Roy, Olivier
Introduction : Selected Papers from the 4th Workshop on Logic, Rationality and Interaction (LORI-4)
in Journal of Logic and Computation (2015)
doi:10.1093/logcom/exv024 ...

Klein, Dominik; Gratzl, Norbert; Roy, Olivier
Introspection, Normality and Agglomeration
In: van der Hoek, Wiebe ; Holliday, Wesley H. ; Wang, Wen-fang(ed.): Logic, Rationality, and Interaction - Berlin ; Heidelberg: Springer, 2015. - pp. 195-206 . - (Lecture Notes in Computer Science; 9394)
doi:10.1007/978-3-662-48561-3_16 ...

Anglberger, Albert J. J.; Gratzl, Norbert; Roy, Olivier
Obligation, free choice, and the logic of weakest permissions
in The Review of Symbolic Logic vol. 8 (2015) issue 4. - pp. 807-827
doi:10.1017/S1755020315000209 ...

Dong, Huimin; Roy, Olivier
Three Deontic Logics for Rational Agency in Games
in Studies in Logic vol. 8 (2015) issue 4. - pp. 7-31
https://www.researchgate.net/profile/Huimin_Dong/p ...


Roy, Olivier; Anglberger, Albert J. J.; Gratzl, Norbert
The Logic of Best Actions from a Deontic Perspective
In: Baltag, Alexandru ; Smets, Sonja(ed.): Johan van Benthem on Logic and Information Dynamics - Cham: Springer, 2014. - pp. 657-676 . - (Outstanding Contributions to Logic; 5)
doi:10.1007/978-3-319-06025-5_24 ...

Rechenauer, Martin; Roy, Olivier
The Logical Structure of Scanlon’s Contractualism
In: Cariani, Fabrizio ; Grossi, Davide ; Meheus, Joke ; Parent, Xavier(ed.): Deontic logic and normative systems - Cham: Springer, 2014. - pp. 166-176 . - (Lecture Notes in Computer Science; 8554)
doi:10.1007/978-3-319-08615-6_13 ...

Anglberger, Albert J. J.; Dong, Huimin; Roy, Olivier
Open reading without free choice
In: Cariani, Fabrizio(ed.): Deontic logic and normative systems - Cham: Springer, 2014. - pp. 19-32 . - (Lecture Notes in Computer Science; 8554)
doi:10.1007/978-3-319-08615-6_3 ...

Romeijn, Jan-Willem; Roy, Olivier
Radical Uncertainty : Beyond Probabilistic Models of Belief
in Erkenntnis vol. 79 (2014) issue 6. - pp. 1221-1223
doi:10.1007/s10670-014-9687-9 ...


van Hees, Martin; Pauly, Marc; Roy, Olivier
Democratisch optimisme : deliberatie in theorie en praktijk
In: Aerts, Remieg ; de Goede, Peter(ed.): Omstreden democratie : Over de problemen van een succesverhaal - Amsterdam: Boom, 2013. - pp. 207-223

Logic, Rationality, and Interaction
publ: Grossi, Davide; Roy, Olivier; Huang, Huaxin
Berlin : Springer, 2013 . - (Lecture Notes in Computer Science; 8196)
doi:10.1007/978-3-642-40948-6 ...

Roy, Olivier; Pacuit, Eric
Substantive Assumptions in Interaction : a Logical Perspective
in Synthese vol. 190 (2013) issue 5. - pp. 891-908
doi:10.1007/s11229-012-0191-y ...


Dégremont, Cédric; Roy, Olivier
Agreement Theorems in Dynamic-Epistemic Logic
in Journal of Philosophical Logic vol. 41 (2012) issue 4. - pp. 735-764
doi:10.1007/s10992-012-9236-4 ...
2nd Workshop on Logic, Rationality and Interaction (LORI-II), Chongqing, China

Egré, Paul; Roy, Olivier
Les conventions sans la connaissance commune?
in Klēsis (2012) issue 24. - pp. 272-310
http://www.revue-klesis.org/pdf/Klesis-Lewis-11-Eg ...

Roy, Olivier; Anglberger, Albert J. J.; Gratzl, Norbert
The logic of obligation as weakest permission
In: Ågotnes, Thomas ; Broersen, Jan ; Elgesem, Dag(ed.): Deontic logic in computer science - Berlin: Springer, 2012. - pp. 139-150 . - (Lecture Notes in Computer Science; 7393)
doi:10.1007/978-3-642-31570-1_10 ...

Roy, Olivier
Rational Choice, Itzhak Gilboa, MIT Press, 2010, xv+ 158 pages.
Economics & Philosophy
doi:10.1017/S0266267112000077 ...


Pacuit, Eric; Roy, Olivier
A dynamic analysis of interactive rationality
In: van Ditmarsch, Hans ; Lang, Jérôme ; Ju, Shier(ed.): Logic, Rationality and Interaction : Third International Workshop, LORI 2011, Guangzhou, China, October 10-13, 2011. Proceedings - Berlin; Heidelberg: Springer, 2011. - pp. 244-257 . - (Lecture Notes in Computer Science; 6953)
doi:10.1007/978-3-642-24130-7_18 ...

van Benthem, Johan; Pacuit, Eric; Roy, Olivier
Toward a theory of play : A logical perspective on games and interaction
in Games vol. 2 (2011) issue 1. - pp. 52-86
doi:10.3390/g2010052 ...


Epistemic Logic : 5 Questions
publ: Hendricks, Vincent F.; Roy, Olivier
Kopenhagen, Dänemark : Automatic Press/VIP, 2010

Pacuit, Eric; Roy, Olivier
Logic, Interaction and Collective Agency
European Summer School in Logic, Language & Information, University of Copenhagen, Denmark

Liu, F.; Roy, Olivier
Advances in Belief Dynamics : introduction
in Synthese vol. 173 (2010) issue 2. - pp. 123-126
doi:10.1007/s11229-009-9710-x ...

Roy, Olivier
Epistemic logic and the foundations of decision and game theory
in Journal of Indian Council of Philosophical Research vol. 27 (2010) issue 2. - pp. 283-314

Roy, Olivier
Interpersonal Coordination and Epistemic Support for Intentions with We-Content
in Economics & Philosophy vol. 26 (2010) issue 03. - pp. 345-367
doi:10.1017/S0266267110000404 ...

Roy, Olivier; Pacuit, Eric
Of what one cannot speak, must one pass over in silence?
s.l., 2010


Roy, Olivier
A dynamic-epistemic hybrid logic for intentions and information changes in strategic games
in Synthese vol. 171 (2009) issue 2. - pp. 291-320
doi:10.1007/s11229-009-9644-3 ...

van Benthem, Johan; Girard, Patrick; Roy, Olivier
Everything else being equal : A modal logic for ceteris paribus preferences
in Journal of Philosophical Logic vol. 38 (2009) issue 1. - pp. 83-125
doi:10.1007/s10992-008-9085-3 ...

Roy, Olivier
Intentions and interactive transformations of decision problems
in Synthese vol. 169 (2009) issue 2. - pp. 335-349
doi:10.1007/s11229-009-9553-5 ...

van Hees, Martin; Roy, Olivier
Intentions, decisions and rationality
In: Boylan, Thomas A. ; Gekker, Ruvin(ed.): Economics, rational choice and normative philosophy - New York ; London: Routledge, 2009. - pp. 56-72


van Hees, Martin; Roy, Olivier
Intentions and Plans in Decision and Game Theory
In: Verbeek, Bruno(ed.): Reasons and intentions - Aldershot: Ashgate, 2008. - pp. 207-226

Roy, Olivier
Thinking before acting : intentions, logic, rational choice
(thesis, , Universiteit van Amsterdam)


Roy, Olivier
Commitment-based decision making for bounded agents
In: Ågotnes, Thomas ; Alechina, Natasha(ed.): Proceedings of the Workshop on Logics for Resource-Bounded Agents : organised as part of the 18th European Summer School on Logic, Language and Information (ESSLLI), August 2006, Malaga, Spain - Malaga: FoLLi, 2006. - pp. 112-123

Pacuit, Eric; Roy, Olivier
Preference based belief dynamics
In: Bonanno, Giacomo ; van der Hoek, Wiebe ; Wooldridge, Michael(ed.): Proceedings of The 7th Conference on Logic and the Foundations of Game and Decision Theory (LOFT 2006) - Liverpool, UK: University of Liverpool, 2006. - pp. 141-150

van Benthem, Johan; van Otterloo, Sieuwert; Roy, Olivier
Preference logic, conditionals and solution concepts in games
In: Lagerlund, Henrik ; Lindström, Sten ; Sliwinski, Rysiek(ed.): Modality matters : twenty-five essays in honour of Krister Segerberg - Uppsala: Univ., Dept. of Philosophy, 2006. - pp. 61-77 . - (Uppsala Philosophical Studies; 53)


van Otterloo, Sieuwert; Roy, Olivier
Verification of voting protocols
Amsterdam, Niederlande, 2005
http://citeseerx.ist.psu.edu/viewdoc/download?doi= ...

Roy, Olivier
What does Game Theory have to do with Plans?
Amsterdam, : Institute for Logic, Language and Computation (ILLC), University, 2005
https://eprints.illc.uva.nl/158/1/PP-2005-13.text. ...


Roy, Olivier
L’ockhamisme de Prior et l’ockhamisme actualiste en logique temporelle
s.l, 2004
http://www.philos.rug.nl/~olivier/docs/acfas2004.p ...

Roy, Olivier
Étude sur les concepts d'agent et de choix dans la logique de l'action de Nuel Belnap et ses collaborateurs
Québec, 2004
(thesis, , Université du Québec à Trois-Rivières)

Olivier Roy

Faculty of Cultural Studies
Chair of Philosophy I

Prof. Dr. Olivier Roy


Office hours: For the Winter Semester 2020/21 the office hours will be held online. More information is available on this elearning page

Building GW II, room 1.18
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95447 Bayreuth

Postal address

Universität Bayreuth
Institut für Philosophie
95440 Bayreuth

Phone: +49 (0)921 / 55-4151
E-mail: Olivier.Roy@uni-bayreuth.de
Homepage: www.philosophie1.uni-bayreuth.de

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