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Olivier Roy
Universität Bayreuth
  1.  71
    Everything Else Being Equal: A Modal Logic for Ceteris Paribus Preferences.Johan Van Benthem, Patrick Girard & Olivier Roy - 2009 - Journal of Philosophical Logic 38 (1):83 - 125.
    This paper presents a new modal logic for ceteris paribus preferences understood in the sense of "all other things being equal". This reading goes back to the seminal work of Von Wright in the early 1960's and has returned in computer science in the 1990' s and in more abstract "dependency logics" today. We show how it differs from ceteris paribus as "all other things being normal", which is used in contexts with preference defeaters. We provide a semantic analysis and (...)
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  2.  25
    All Agreed: Aumann Meets DeGroot.Jan-Willem Romeijn & Olivier Roy - 2018 - Theory and Decision 85 (1):41-60.
    We represent consensus formation processes based on iterated opinion pooling as a dynamic approach to common knowledge of posteriors :1236–1239, 1976; Geanakoplos and Polemarchakis in J Econ Theory 28:192–200, 1982). We thus provide a concrete and plausible Bayesian rationalization of consensus through iterated pooling. The link clarifies the conditions under which iterated pooling can be rationalized from a Bayesian perspective, and offers an understanding of iterated pooling in terms of higher-order beliefs.
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  3. Shared Intentions, Loose Groups and Pooled Knowledge.Olivier Roy & Anne Schwenkenbecher - 2019 - Synthese (5):4523-4541.
    We study shared intentions in what we call “loose groups”. These are groups that lack a codified organizational structure, and where the communication channels between group members are either unreliable or not completely open. We start by formulating two desiderata for shared intentions in such groups. We then argue that no existing account meets these two desiderata, because they assume either too strong or too weak an epistemic condition, that is, a condition on what the group members know and believe (...)
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  4.  52
    Agreement Theorems in Dynamic-Epistemic Logic.Cédric Dégremont & Oliver Roy - 2012 - Journal of Philosophical Logic 41 (4):735-764.
    This paper introduces Agreement Theorems to dynamic-epistemic logic. We show first that common belief of posteriors is sufficient for agreement in epistemic-plausibility models, under common and well-founded priors. We do not restrict ourselves to the finite case, showing that in countable structures the results hold if and only if the underlying plausibility ordering is well-founded. We then show that neither well-foundedness nor common priors are expressible in the language commonly used to describe and reason about epistemic-plausibility models. The static agreement (...)
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  5.  25
    Obligation, Free Choice, and the Logic of Weakest Permissions.Albert J. J. Anglberger, Nobert Gratzl & Olivier Roy - 2015 - Review of Symbolic Logic 8 (4):807-827.
    We introduce a new understanding of deontic modals that we callobligations as weakest permissions. We argue for its philosophical plausibility, study its expressive power in neighborhood models, provide a complete Hilbert-style axiom system for it and show that it can be extended and applied to practical norms in decision and game theory.
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  6.  77
    Intentions and Interactive Transformations of Decision Problems.Olivier Roy - 2009 - Synthese 169 (2):335 - 349.
    In this paper I study two ways of transforming decision problems on the basis of previously adopted intentions, ruling out incompatible options and imposing a standard of relevance, with a particular focus on situations of strategic interaction. I show that in such situations problems arise which do not appear in the single-agent case, namely that transformation of decision problems can leave the agents with no option compatible with what they intend. I characterize conditions on the agents’ intentions which avoid such (...)
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  7.  84
    Substantive Assumptions in Interaction: A Logical Perspective.Olivier Roy & Eric Pacuit - 2013 - Synthese 190 (5):891-908.
    In this paper we study substantive assumptions in social interaction. By substantive assumptions we mean contingent assumptions about what the players know and believe about each other’s choices and information. We first explain why substantive assumptions are fundamental for the analysis of games and, more generally, social interaction. Then we show that they can be compared formally, and that there exist contexts where no substantive assumptions are being made. Finally we show that the questions raised in this paper are related (...)
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  8.  30
    Knowledge, Belief, Normality, and Introspection.Dominik Klein, Olivier Roy & Norbert Gratzl - 2017 - Synthese 195 (10):4343-4372.
    We study two logics of knowledge and belief stemming from the work of Stalnaker, omitting positive introspection for knowledge. The two systems are equivalent with positive introspection, but not without. We show that while the logic of beliefs remains unaffected by omitting introspection for knowledge in one system, it brings significant changes to the other. The resulting logic of belief is non-normal, and its complete axiomatization uses an infinite hierarchy of coherence constraints. We conclude by returning to the philosophical interpretation (...)
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  9. A Dynamic-Epistemic Hybrid Logic for Intentions and Information Changes in Strategic Games.O. Roy - 2009 - Synthese 171 (2):291 - 320.
    In this paper I present a dynamic-epistemic hybrid logic for reasoning about information and intention changes in situations of strategic interaction. I provide a complete axiomatization for this logic, and then use it to study intentions-based transformations of decision problems.
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  10. Dynamic Consequence for Soft Information.Olivier Roy & Ole Thomassen Hjortland - forthcoming - Journal of Logic and Computation.
  11. Intentions and Plans in Decision and Game Theory.Martin van Hees & Olivier Roy - 2007 - In Bruno Verbeek (ed.), Reasons and Intentions. Ashgate.
  12.  6
    Leibniz Et la Chine.Olivier Roy - 1972 - Vrin.
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  13.  5
    Priority Merge and Intersection Modalities.Zoé Christoff, Norbert Gratzl & Olivier Roy - forthcoming - Review of Symbolic Logic:1-32.
    We study the logic of so-called lexicographic or priority merge for multi-agent plausibility models. We start with a systematic comparison between the logical behavior of priority merge and the more standard notion of pooling through intersection, used to define, for instance, distributed knowledge. We then provide a sound and complete axiomatization of the logic of priority merge, as well as a proof theory in labeled sequents that admits cut. We finally study Moorean phenomena and define a dynamic resolution operator for (...)
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  14.  30
    Les Conventions Sans la Connaissance Commune?Paul Egré & Olivier Roy - 2010 - Klēsis Revue Philosophique 24:272-310.
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  15. Epistemic Logic: 5 Questions.Vincent F. Hendricks & Olivier Roy (eds.) - 2010
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  16.  18
    Knowledge, Belief, Normality, and Introspection.Dominik Klein, Olivier Roy & Norbert Gratzl - 2017 - Synthese:1-30.
    We study two logics of knowledge and belief stemming from the work of Stalnaker, omitting positive introspection for knowledge. The two systems are equivalent with positive introspection, but not without. We show that while the logic of beliefs remains unaffected by omitting introspection for knowledge in one system, it brings significant changes to the other. The resulting logic of belief is non-normal, and its complete axiomatization uses an infinite hierarchy of coherence constraints. We conclude by returning to the philosophical interpretation (...)
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  17.  20
    From Permissions to Obligations and Beyond: An Editorial.P. Kulicki & O. Roy - 2020 - Studia Logica 108 (1):1-3.
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  18.  88
    Advances in Belief Dynamics: Introduction.F. Liu & O. Roy - 2010 - Synthese 173 (2):123-126.
    This is the introduction of the special issue,.
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  19.  41
    Radical Uncertainty: Beyond Probabilistic Models of Belief.Jan-Willem Romeijn & Olivier Roy - 2014 - Erkenntnis 79 (6):1221-1223.
    Over the past decades or so the probabilistic model of rational belief has enjoyed increasing interest from researchers in epistemology and the philosophy of science. Of course, such probabilistic models were used for much longer in economics, in game theory, and in other disciplines concerned with decision making. Moreover, Carnap and co-workers used probability theory to explicate philosophical notions of confirmation and induction, thereby targeting epistemic rather than decision-theoretic aspects of rationality. However, following Carnap’s early applications, philosophy has more recently (...)
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  20.  52
    Deontic Logic and Normative Systems.Olivier Roy, Allard Tamminga & Malte Willer (eds.) - 2016 - London, UK: College Publications.
    The biennial DEON conferences are designed to promote interdisciplinary cooperation amongst scholars interested in linking the formal-logical study of normative concepts and normative systems with computer science, artificial intelligence, linguistics, philosophy, organization theory and law. In addition to these general themes, DEON 2016 encouraged a special focus on the topic "Reasons, Argumentation and Justification.".
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  21. Epistemic Logic and the Foundations of Decision and Game Theory.Olivier Roy - 2010 - Journal of the Indian Council of Philosophical Research 27 (2):283-314.
     
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  22.  35
    Fundamentalism, Traditionalism, and Islam.Oliver Roy - 1985 - Telos: Critical Theory of the Contemporary 1985 (65):122-127.
    Obscurantism, return of the Middle Ages, fascism, clericalism …. Utter nonsense has been written on the return of religion in the Muslem world, reflecting the old Western phantasm about Islam. In fact, the phenomena grouped under the rubric of “fundamentalism” are quite heterogenous and belong to different catagories, of which only one — Islamicism — is really new. Islamic revivalism must be understood not in terms of recent Western history, emphasizing the emergence of the modern state from the secularization of (...)
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  23.  1
    Fundamentalism, Traditionalism, and Islam.O. Roy - 1985 - Télos 1985 (65):122-127.
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  24. Interpersonal Coordination and Epistemic Support for Intentions with We-Content.Olivier Roy - 2010 - Economics and Philosophy 26 (3):345-367.
    In this paper I study intentions of the form, that is, intentions with a we-content, and their role in interpersonal coordination. I focus on the notion of epistemic support for such intentions. Using tools from epistemic game theory and epistemic logic, I cast doubt on whether such support guarantees the other agents' conditional mediation in the achievement of such intentions, something that appears important if intentions with a we-content are to count as genuine intentions. I then formulate a stronger version (...)
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  25.  17
    Intentions rationnelles et acceptations en délibération.Olivier Roy - 2008 - Philosophiques 35 (2):525-545.
    Dans cet article, je montre que quatre normes de rationalité associées aux intentions peuvent être déduites de normes similaires s’appliquant aux acceptations en contextes délibératifs, un type d’état mental apparenté mais irréductible aux croyances par lequel un agent tient certains faits pour acquis lorsqu’il délibère. Je montre que cette approche, que je nomme le pragmatisme hybride, évite certaines limitations de l’approche la plus prisée dans la littérature, le cognitivisme, et qu’en comparaison avec les approches purement pragmatistes, principales rivales du cognitivisme, (...)
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  26. L'Asie Centrale Et le National-Soviétisme.Olivier Roy - 1994 - Cahiers Internationaux de Sociologie 96:177-189.
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  27. Leibniz et la Chine.Olivier Roy - 1974 - Revue Philosophique de la France Et de l'Etranger 164 (3):329-329.
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  28. Le Nouvel esprit scientifique de G. Bachelard, collection « Philosophie ».O. Roy - 1983 - Revue de Métaphysique et de Morale 88 (2):274-274.
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  29. Quelques considérations sur la logique temporelle actualiste.Olivier Roy - 2004 - Revue Phares 4 (1).
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  30.  19
    Rational Choice. [REVIEW]Olivier Roy - 2012 - Economics and Philosophy 28 (1).
  31.  47
    Rational Choice, Itzhak Gilboa, MIT Press, 2010, Xv + 158 Pages. [REVIEW]Olivier Roy - 2012 - Economics and Philosophy 28 (1):102-107.
    Book Reviews Olivier Roy, Economics and Philosophy, FirstView Article.
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