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Profile: Patrick Girard (University of Auckland)
  1.  37
    Everything Else Being Equal: A Modal Logic for Ceteris Paribus Preferences.Johan Van Benthem, Patrick Girard & Olivier Roy - 2008 - 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.  23
    Logical Dynamics of Belief Change in the Community.Fenrong Liu, Jeremy Seligman & Patrick Girard - 2014 - Synthese 191 (11):2403-2431.
    In this paper we explore the relationship between norms of belief revision that may be adopted by members of a community and the resulting dynamic properties of the distribution of beliefs across that community. We show that at a qualitative level many aspects of social belief change can be obtained from a very simple model, which we call ‘threshold influence’. In particular, we focus on the question of what makes the beliefs of a community stable under various dynamical situations. We (...)
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  3. Antirealism and the Conditional Fallacy: The Semantic Approach.Patrick Girard & Luca Moretti - 2014 - Journal of Philosophical Logic 43 (4):761-783.
    The expression conditional fallacy identifies a family of arguments deemed to entail odd and false consequences for notions defined in terms of counterfactuals. The antirealist notion of truth is typically defined in terms of what a rational enquirer or a community of rational enquirers would believe if they were suitably informed. This notion is deemed to entail, via the conditional fallacy, odd and false propositions, for example that there necessarily exists a rational enquirer. If these consequences do indeed follow from (...)
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  4.  30
    What Is an Inconsistent Truth Table?Zach Weber, Guillermo Badia & Patrick Girard - 2016 - Australasian Journal of Philosophy 94 (3):533-548.
    ABSTRACTDo truth tables—the ordinary sort that we use in teaching and explaining basic propositional logic—require an assumption of consistency for their construction? In this essay we show that truth tables can be built in a consistency-independent paraconsistent setting, without any appeal to classical logic. This is evidence for a more general claim—that when we write down the orthodox semantic clauses for a logic, whatever logic we presuppose in the background will be the logic that appears in the foreground. Rather than (...)
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  5.  34
    Bad Worlds.Patrick Girard & Zach Weber - 2015 - Thought: A Journal of Philosophy 4 (2):93-101.
    The idea of relevant logic—that irrelevant inferences are invalid—is appealing. But the standard semantics for relevant logics involve baroque metaphysics: a three-place accessibility relation, a star operator, and ‘bad’ worlds. In this article we propose that these oddities express a mismatch between non-classical object theory and classical metatheory. A uniformly relevant semantics for relevant logic is a better fit.
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  6.  15
    From Onions to Broccoli: Generalizing Lewis' Counterfactual Logic.Patrick Girard - 2007 - Journal of Applied Non-Classical Logics 17 (2):213-229.
    We present a generalization of Segerberg's onion semantics for belief revision, in which the linearity of the spheres need not occur. The resulting logic is called broccoli logic. We provide a minimal relational logic, with a bi-modal neighborhood semantics. We then show that broccoli logic is a well-known conditional logic, the Burgess-Veltman minimal conditional logic.
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  7.  3
    Prioritised Ceteris Paribus Logic for Counterfactual Reasoning.Patrick Girard & Marcus A. Triplett - forthcoming - Synthese:1-23.
    The semantics for counterfactuals due to David Lewis has been challenged by appealing to miracles. Miracles may skew a given similarity order in favour of those possible worlds which exhibit them. Lewis responded with a system of priorities that mitigates the significance of miracles when constructing similarity relations. We propose a prioritised ceteris paribus analysis of counterfactuals inspired by Lewis’ system of priorities. By analysing the couterfactuals with a ceteris paribus clause one forces out, in a natural manner, those possible (...)
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  8.  25
    Paraconsistent Dynamics.Patrick Girard & Koji Tanaka - 2016 - Synthese 193 (1):1-14.
    It has been an open question whether or not we can define a belief revision operation that is distinct from simple belief expansion using paraconsistent logic. In this paper, we investigate the possibility of meeting the challenge of defining a belief revision operation using the resources made available by the study of dynamic epistemic logic in the presence of paraconsistent logic. We will show that it is possible to define dynamic operations of belief revision in a paraconsistent setting.
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  9.  1
    Front Matter.Zach Weber, Maarten McKubre-Jordens & Patrick Girard - 2017 - Australasian Journal of Logic 14 (1).
    Editors' Introduction and List of Contributors.
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  10. Logic of Promotion and Demotion.Patrick Girard - 1st ed. 2015 - In Emiliano Lorini & Andreas Herzig (eds.), The Cognitive Foundations of Group Attitudes and Social Interaction. Springer Verlag.
     
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  11. Review: H. Van Ditmarsch, W. Van der Hoek and B. Kooi’s Dynamic Epistemic Logic. [REVIEW]Patrick Girard - 2009 - Australasian Journal of Logic 7 (7):26-31.
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  12. Flexibility in Ceteris Paribus Reasoning.Jeremy Seligman & Patrick Girard - 2011 - Australasian Journal of Logic 10 (2).
    Ceteris Paribus clauses in reasoning are used to allow for defeaters of norms, rules or laws, such as in von Wright’s example “I prefer my raincoat over my umbrella, everything else being equal”. In earlier work, a logical analysis is offered in which sets of formulas Γ, embedded in modal operators, provide necessary and sufficient conditions for things to be equal in ceteris paribus clauses. For most laws, the set of things allowed to vary is small, often finite, and so (...)
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