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  1. E. H. Alves & J. A. D. Guerzoni (1990). Extending Montague's System: A Three Valued Intensional Logic. Studia Logica 49 (1):127 - 132.
    In this note we present a three-valued intensional logic, which is an extension of both Montague's intensional logic and ukasiewicz three-valued logic. Our system is obtained by adapting Gallin's version of intensional logic (see Gallin, D., Intensional and Higher-order Modal Logic). Here we give only the necessary modifications to the latter. An acquaintance with Gallin's work is pressuposed.
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  2. C. Anthony Anderson (1998). Alonzo Church's Contributions to Philosophy and Intensional Logic. Bulletin of Symbolic Logic 4 (2):129-171.
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  3. C. Anthony Anderson (1993). Zalta's Intensional Logic. Philosophical Studies 69 (2-3):221 - 229.
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  4. C. Anthony Anderson (1986). Some Difficulties Concerning Russellian Intensional Logic. Noûs 20 (1):35-43.
  5. Lennart Åqvist (1999). The Logic of Historical Necessity as Founded on Two-Dimensional Modal Tense Logic. Journal of Philosophical Logic 28 (4):329-369.
    We consider a version of so called T x W logic for historical necessity in the sense of R.H. Thomason (1984), which is somewhat special in three respects: (i) it is explicitly based on two-dimensional modal logic in the sense of Segerberg (1973); (ii) for reasons of applicability to interesting fields of philosophical logic, it conceives of time as being discrete and finite in the sense of having a beginning and an end; and (iii) it utilizes the technique of systematic (...)
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  6. Andrew Bacon, John Hawthorne & Gabriel Uzquiano (2016). Higher-Order Free Logic and the Prior-Kaplan Paradox. Canadian Journal of Philosophy 46 (4-5):493-541.
    The principle of universal instantiation plays a pivotal role both in the derivation of intensional paradoxes such as Prior’s paradox and Kaplan’s paradox and the debate between necessitism and contingentism. We outline a distinctively free logical approach to the intensional paradoxes and note how the free logical outlook allows one to distinguish two different, though allied themes in higher-order necessitism. We examine the costs of this solution and compare it with the more familiar ramificationist approaches to higher-order logic. Our assessment (...)
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  7. George Bealer (1998). Intensional Entities. In Edward Craig (ed.), Routledge Encyclopedia of Philosophy. Routledge 803-7.
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  8. Steven M. Duncan, Possibilities That Matter III: Materially Necessary Being.
    This is the third in a series of papers on material modality, which explores the concept of a materially necessary being and argues that such a being exists.
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  9. Steven M. Duncan, Possibilities That Matter IV: The Ground of All Possibilities.
    This is the final paper in the Possibilities that Matter series and attempts to complete the project of constructing a material interpretation of modal logic.
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  10. Steven M. Duncan, Possibilities That Matter I: Material Possibility.
    This is the first of a series of four papers presenting modal logic as a branch of material, rather than merely formal, logic.
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  11. Steven M. Duncan, Possibilities That Matter II: Material Contingency and Sufficient Reason.
    This is the second of a series of papers inspired by a paper I wrote around 1989. In this paper, I consider the notion of material contingency and relate it to the traditional, metaphysically loaded Principle of Sufficient Reason.
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  12. Alessandro Giordani (forthcoming). Perspectival Logic of Acceptance and Rejection. Logique and Analyse.
    This paper aims at developing a logical theory of perspectival epistemic attitudes. After presenting a standard framework for modeling acceptance, where the epistemic space of an agent coincides with a unique epistemic cell, more complex systems are introduced, which are characterized by the existence of many connected epistemic cells, and different possible attitudes towards a proposition, both positive and negative, are discussed. In doing that, we also propose some interesting ways in which the systems can be interpreted on well known (...)
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  13. Thibaut Giraud (forthcoming). On Modal Meinongianism. Synthese:1-18.
    Modal Meinongianism is a form of Meinongianism whose main supporters are Graham Priest and Francesco Berto. The main idea of modal Meinongianism is to restrict the logical deviance of Meinongian non-existent objects to impossible worlds and thus prevent it from “contaminating” the actual world: the round square is round and not round, but not in the actual world, only in an impossible world. In the actual world, supposedly, no contradiction is true. I will show that Priest’s semantics, as originally formulated (...)
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  14. Jan Heylen (2010). Carnap's Theory of Descriptions and its Problems. Studia Logica 94 (3):355-380.
    Carnap's theory of descriptions was restricted in two ways. First, the descriptive conditions had to be non-modal. Second, only primitive predicates or the identity predicate could be used to predicate something of the descriptum . The motivating reasons for these two restrictions that can be found in the literature will be critically discussed. Both restrictions can be relaxed, but Carnap's theory can still be blamed for not dealing adequately with improper descriptions.
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  15. Lloyd Humberstone (2016). Philosophical Applications of Modal Logic. College Publications.
  16. David Israel & John Perry (1996). Where Monsters Dwell. In Jerry Seligman & Dag Westerståhl (eds.), Logic, Language and Computation. Csli Publications, Stanford 1--303.
    Kaplan says that monsters violate Principle 2 of his theory. Principle 2 is that indexicals, pure and demonstrative alike, are directly referential. In providing this explanation of there being no monsters, Kaplan feels his theory has an advantage over double-indexing theories like Kamp’s or Segerberg’s (or Stalnaker’s), which either embrace monsters or avoid them only by ad hoc stipulation, in the sharp conceptual distinction it draws between circumstances of evaluation and contexts of utterance. We shall argue that Kaplan’s prohibition is (...)
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  17. Heylen Jan (2009). Carnapian Modal and Epistemic Arithmetic. In Carrara Massimiliano & Morato Vittorio (eds.), Language, Knowledge, and Metaphysics. Selected papers from the First SIFA Graduate Conference. College Publications 97-121.
    The subject of the first section is Carnapian modal logic. One of the things I will do there is to prove that certain description principles, viz. the ''self-predication principles'', i.e. the principles according to which a descriptive term satisfies its own descriptive condition, are theorems and that others are not. The second section will be devoted to Carnapian modal arithmetic. I will prove that, if the arithmetical theory contains the standard weak principle of induction, modal truth collapses to truth. Then (...)
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  18. David Kaplan (1964). Foundations of Intensional Logic. Dissertation, UCLA
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  19. Franck Lihoreau & Manuel Rebuschi (eds.) (2014). Epistemology, Context, and Formalism. Springer Science & Business Media.
    Acknowledgements Five out of the 13 contributions to this volume originate from papers which were presented at the international workshop on “Epistemology, Context, Formalism” held at the MSH-Lorraine in Nancy, France, on November the ...
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  20. Pavel Materna (2003). Actuality and Possibility. In A. Rojszczak, J. Cachro & G. Kurczewski (eds.), Philosophical Dimensions of Logic and Science. Kluwer Academic Publishers 289--295.
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  21. Jonathan Payne (2015). Extensionalizing Intensional Second-Order Logic. Notre Dame Journal of Formal Logic 56 (1):243-261.
    Neo-Fregean approaches to set theory, following Frege, have it that sets are the extensions of concepts, where concepts are the values of second-order variables. The idea is that, given a second-order entity $X$, there may be an object $\varepsilon X$, which is the extension of X. Other writers have also claimed a similar relationship between second-order logic and set theory, where sets arise from pluralities. This paper considers two interpretations of second-order logic—as being either extensional or intensional—and whether either is (...)
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  22. Stefano Predelli (2008). Modal Monsters and Talk About Fiction. Journal of Philosophical Logic 37 (3):277-297.
    This paper argues in favor of a treatment of discourse about fiction in terms of operators on character, that is, Kaplanesque ‘monsters’. The first three sections criticize the traditional analysis of ‘according to the fiction’ as an intensional operator, and the approach to fictional discourse grounded on the notion of contextual shifts. The final sections explain how an analysis in terms of monsters yields the correct readings for a variety of examples involving modal and temporal indexicals.
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  23. W. V. Quine (1991). Two Dogmas in Retrospect. Canadian Journal of Philosophy 21 (3):265 - 274.
    In retrospecting "Two Dogmas" I find myself overshooting by twenty years. I think back to college days, 61 years agao. I majored in mathematics and was doing my honors reading in mathematical logic, a subject that had not yet penetrated the Oberlin curriculum. My new love, in the platonic sense, was Whitehead and Russell's Principia Mathematica.
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  24. Krister Segerberg (1992). Getting Started: Beginnings in the Logic of Action. Studia Logica 51 (3-4):347 - 378.
    A history of the logic of action is outlined, beginning with St Anselm. Five modern authors are discussed in some detail: von Wright, Fitch, Kanger, Chellas and Pratt.
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  25. Seligman Jerry & Westerstahl Dag (eds.) (1996). Logic, Language and Computation. Center for the Study of Language and Inf.
  26. Graham White (2008). Causality, Modality, and Explanation. Notre Dame Journal of Formal Logic 49 (3):313-343.
    We start with Fodor's critique of cognitive science in "The mind doesn't work that way: The scope and limits of computational psychology": he argues that much mental activity cannot be handled by the current methods of cognitive science because it is nonmonotonic and, therefore, is global in nature, is not context-free, and is thus not capable of being formalized by a Turing-like mental architecture. We look at the use of nonmonotonic logic in the artificial intelligence community, particularly with the discussion (...)
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  27. Edward N. Zalta (1997). The Modal Object Calculus and its Interpretation. In M. de Rijke (ed.), Advances in Intensional Logic. Kluwer 249--279.
    The modal object calculus is the system of logic which houses the (proper) axiomatic theory of abstract objects. The calculus has some rather interesting features in and of itself, independent of the proper theory. The most sophisticated, type-theoretic incarnation of the calculus can be used to analyze the intensional contexts of natural language and so constitutes an intensional logic. However, the simpler second-order version of the calculus couches a theory of fine-grained properties, relations and propositions and serves as a framework (...)
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  28. Edward N. Zalta (1993). A Philosophical Conception of Propositional Modal Logic. Philosophical Topics 21 (2):263-281.
    The author revises the formulation of propositional modal logic by interposing a domain of structured propositions between the modal language and the models. Interpretations of the language (i.e., ways of mapping the language into the domain of propositions) are distinguished from models of the domain of propositions (i.e., ways of assigning truth values to propositions at each world), and this contrasts with the traditional formulation. Truth and logical consequence are defined, in the first instance, as properties of, and relations among, (...)
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  29. Edward N. Zalta (1993). Replies to the Critics. Philosophical Studies 69 (2-3):231-242.
    In an author-meets-critics session at the March 1992 Pacific APA meetings, the critics (Christopher Menzel, Harry Deutsch, and C. Anthony Anderson) commented on the author's book *Intensional Logic and the Metaphysics of Intentionality* (Cambridge, MA: MIT/Bradford, 1988). The critical commentaries are published in this issue together with these replies by the author. The author responds to questions concerning the system he proposes, and in particular, to questions concerning the treatment of modality, the semantics of belief reports, and the general efficacy (...)
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