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Jeff Pelletier [18]Jeffry Pelletier [1]
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Profile: Jeffry Pelletier (University of Alberta, Simon Fraser University)
Profile: Jeff Pelletier
  1. Jeff Pelletier, CASC: Effective Evaluation Having an Effect.
    Although advances in the underlying theory of a subdiscipline of AI can result in impressive increases in the performance of systems that employ such an underlying theory, this sometimes seems to be almost "by accident." The reason for this impression is that the impressive new advance in performance sometimes seems to be a feature merely of the specific example tests that are being demonstrated. And this impression is further strengthened when one notes that, in general, a localized theoretical advance is (...)
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  2. Jeff Pelletier, The Development of CASC.
    Advances in the underlying theory of a subdiscipline of AI can result in an apparently impressive improvement in the performance of a system that incorporates the advance. This impression typically comes from observing improved performance of the new system on some test problems. However, the improvement in performance may be for only the problems used in the testing, and performance on other problems may be degraded, possibly resulting overall in an degradation of the system’s performance. This comes about typically when (...)
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  3. Thomas Hofweber & Jeff Pelletier, Encuneral Noun Phrases.
    The semantics of noun phrases (NPs) is of crucial importance for both philosophy and linguistics. Throughout much of the history of the debate about the semantics of noun phrases there has been an implicit assumption about how they are to be understood. Basically, it is the assumption that NPs come only in two kinds. In this paper we would like to make that assumption explicit and discuss it and its status in the semantics of natural language. We will have a (...)
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  4. Jeff Pelletier, A Formal Analysis of Relevance.
    We investigate the notion of relevance as it pertains to ‘commonsense’, subjunctive conditionals. Relevance is taken here as a relation between a property (such as having a broken wing) and a conditional (such as birds typically fly). Specifically, we explore a notion of ‘causative’ relevance, distinct from ‘evidential’ relevance found, for example, in probabilistic approaches. A series of postulates characterising a minimal, parsimonious concept of relevance is developed. Along the way we argue that no purely logical account of relevance (even (...)
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  5. Jeff Pelletier, Briefly Noted.
    statistical linguistics with its own conception the main it is very clearly written. If the of what semantics is, IL, or some variant of..
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  6. Jeff Pelletier, Book Reviews. [REVIEW]
    Computational semantics is the study of how to represent meaning in a way that computers can use. For the authors of this textbook, this study includes the representation of the meaning of natural language in logic formalisms, the recognition of certain relations that hold within this formalization (such as synonymy, consistency, and implication), and the computational implementation of all this. I think that, while there probably are not many courses devoted to computational semantics, this book could profitably be incorporated into (...)
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  7. Jeff Pelletier, Belief Revision as Propositional Update.
    In this study, we examine the problem of belief revision, defined as deciding whic h of several initially-accepted sentences to disbelieve, when new information presents a l ogical inconsistency with the initial set. In the first three experiments, the initial sentence set included a conditional sentence, a non-conditional sentence, and an inferred conclusi on drawn from the first two. The new information contradicted the inferred conclusion. Results indicated that the conditional sentences (...)
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  8. Jeff Pelletier, Enumerating the Preconditions of Agent Message Types.
    Agent communication languages (ACLs) invoke speech act theory and define individual message types by reference to particular combinations of beliefs and desires of the speaker (feasibility preconditions). Even when the mental states are restricted to a small set of nested beliefs, it seems that there might be a very large number of different possible preconditions, and therefore a very large number of different message types. With some constraints on the mental attitude of the speaker, we enumerate the possible belief states (...)
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  9. Jeff Pelletier, Human Benchmarks on Ai's Benchmark Problems.
    Default reasoning occurs when the available information does not deductively guarantee the truth of the conclusion; and the conclusion is nonetheless correctly arrived at. The formalisms that have been developed in Artificial Intelligence to capture this mode of reasoning have suffered from a lack of agreement as to which non-monotonic inferences should be considered correct; and so Lifschitz 1989 produced a set of “Nonmonotonic Benchmark Problems” which all future formalisms are supposed to honor. The present work investigates the extent to (...)
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  10. Jeff Pelletier, Is Logic All in Our.
    Psychologism in logic is the doctrine that the semantic content of logical terms is in some way a feature of human psychology. We consider the historically influential version of the doctrine, Psychological Individualism, and the many counter-arguments to it. We then propose and assess various modifications to the doctrine that might allow it to avoid the classical objections. We call these Psychological Descriptivism, Teleological Cognitive Architecture, and Ideal Cognizers. These characterizations give some order to the wide range of modern views (...)
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  11. Jeff Pelletier, On an Argument Against Semantic Compositionality.
    James Higginbotham (1986) presents a theory of semantic interpretation which violates the principle of semantic compositionality. He gives an argument by means of an example construction in favor of his contention. I show that compositioinal theories have more resources than some researchers give it credit for, and that these can be used in two different ways to account for the phenomenon Higginbotham describes.
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  12. Jeff Pelletier, On Reasoning with Default Rules and Exceptions.
    Department of Computing Science Departments of Philosophy and Computing Science University of Alberta University of Alberta Edmonton, Alberta T6G 2H1 Edmonton, Alberta T6G 2H..
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  13. Jeff Pelletier, The Average American has 2.3 Children.
    Average-NPs, such as the one in the title of this paper, have been claimed to be ‘linguistically identical’ to any other definite-NPs but at the same time to be ‘semantically inconsistent’ with these other definite-NPs. To some this is an ironclad proof of the irrelevance of semantics to linguistics. We argue that both of the initial claims are wrong: average-NPs are not ‘linguistically identical’ to other definite-NPs but instead show a number of interesting divergences, and we provide a plausible semantic (...)
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  14. Jeff Pelletier, Ternary Exclusive Or.
    Ternary exclusive or is the (two valued) truth function that is true just in case exactly one of its three arguments is true. This is an interesting truth function, not definable in terms of the binary exclusive or alone, although the binary case is definable in terms of the ternary case. This article investigates the types of truth functions that can be defined by ternary exclusive or, and relates these findings to the seminal work of Emil Post.
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  15. Jeff Pelletier, Thinking of 'Not'.
    A certain direction in cognitive science has been to try to “ground” public language statements in some species of mental representation. A central tenet of this trend is that communication – that is, public language – succeeds (when it does) because the elements of this public language are in some way correlated with mental items of both the speaker and the audience so that the mental state evoked in the audience by the use of that piece of public language is (...)
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  16. Jeff Pelletier, Vagueness.
    Vagueness: an expression is vague if and only if it is possible that it give rise to a “borderline case.” A borderline case is a situation in which the application of a particular expression to a (name of) a particular object does not generate an expression with a definite TRUTH-VALUE. That is, the piece of language in question neither applies to the object nor fails to apply.
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  17. Jeff Pelletier, What is Frege's Theory of Descriptions?
    In the case of an actual proper name such as ‘Aristotle’ opinions as to the Sinn may differ. It might, for instance, be taken to be the following: the pupil of Plato and teacher of Alexander the Great. Anybody who does this will attach another Sinn to the sentence ‘Aristotle was born in Stagira’ than will a man who takes as the Sinn of the name: the teacher of Alexander the Great who was born in Stagira. So long as the (...)
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  18. Jeff Pelletier, What Should Default Reasoning Be, by Default?
    This is a position paper concerning the role of empirical studies of human default reasoning in the formalization of AI theories of default reasoning. We note that AI motivates its theoretical enterprise by reference to human skill at default reasoning, but that the actual research does not make any use of this sort of information and instead relies on intuitions of individual investigators. We discuss two reasons theorists might not consider human performance relevant to formalizing default reasoning: (a) that intuitions (...)
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  19. Jeffry Pelletier (1977). Formal Philosophy. Metaphilosophy 8 (4):320-341.
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