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871.
George Voutsadakis 《Studia Logica》2013,101(4):849-899
Wójcicki has provided a characterization of selfextensional logics as those that can be endowed with a complete local referential semantics. His result was extended by Jansana and Palmigiano, who developed a duality between the category of reduced congruential atlases and that of reduced referential algebras over a fixed similarity type. This duality restricts to one between reduced atlas models and reduced referential algebra models of selfextensional logics. In this paper referential algebraic systems and congruential atlas systems are introduced, which abstract referential algebras and congruential atlases, respectively. This enables the formulation of an analog of Wójcicki’s Theorem for logics formalized as π-institutions. Moreover, the results of Jansana and Palmigiano are generalized to obtain a duality between congruential atlas systems and referential algebraic systems over a fixed categorical algebraic signature. In future work, the duality obtained in this paper will be used to obtain one between atlas system models and referential algebraic system models of an arbitrary selfextensional π-institution. Using this latter duality, the characterization of fully selfextensional deductive systems among the selfextensional ones, that was obtained by Jansana and Palmigiano, can be extended to a similar characterization of fully selfextensional π-institutions among appropriately chosen classes of selfextensional ones. 相似文献
872.
873.
George Boolos 《逻辑史和逻辑哲学》2013,34(3):223-229
In his recent paper in History and Philosophy of Logic, John Kearns argues for a solution of the Liar paradox using an illocutionary logic (Kearns 2007 ). Paraconsistent approaches, especially dialetheism, which accepts the Liar as being both true and false, are rejected by Kearns as making no ‘clear sense’ (p. 51). In this critical note, I want to highlight some shortcomings of Kearns' approach that concern a general difficulty for supposed solutions to (semantic) antinomies like the Liar. It is not controversial that there are languages which avoid the Liar. For example, the language which consists of the single sentence ‘Benedict XVI was born in Germany’ lacks the resources to talk about semantics at all and thus avoids the Liar. Similarly, more interesting languages such as the propositional calculus avoid the Liar by lacking the power to express semantic concepts or to quantify over propositions. Kearns also agrees with the dialetheist claim that natural languages are semantically closed (i.e. are able to talk about their sentences and the semantic concepts and distinctions they employ). Without semantic closure, the Liar would be no real problem for us (speakers of natural languages). But given the claim, the expressive power of natural languages may lead to the semantic antinomies. The dialetheist argues for his position by proposing a general hypothesis (cf. Bremer 2005 , pp. 27–28): ‘(Dilemma) A linguistic framework that solves some antinomies and is able to express its linguistic resources is confronted with strengthened versions of the antinomies’. Thus, the dialetheist claims that either some semantic concepts used in a supposed solution to a semantic antinomy are inexpressible in the framework used (and so, in view of the claim, violate the aim of being a model of natural language), or else old antinomies are exchanged for new ones. One horn of the dilemma is having inexpressible semantic properties. The other is having strengthened versions of the antinomies, once all semantic properties used are expressible. This dilemma applies, I claim, to Kearns' approach as well. 相似文献
874.
This article answers some of the criticisms and suggestions of the three commentaries. We showed, in agreement with Coyle, that (i) variability is indeed distinct from speed, (ii) they both additively reflect processing efficiency and (iii) that they differentially relate to WM and gf during development. In agreement with Kail, we showed that developmental intelligence and psychometric intelligence are (i) related but distinct, they additively contribute to school learning and (iii) their role varies with developmental phase. Finally, in agreement with Pascual-Leone, we proposed a number of higher level hidden constructs to account for the data patterns observed between empirical constructs, such as speed, variability, WM, and reasoning. 相似文献
875.
George Weaver 《逻辑史和逻辑哲学》2013,34(2):189-190
After an introduction which demonstrates the failure of the equational analogue of Beth’s definability theorem, the first two sections of this paper are devoted to an elementary exposition of a proof that a functional constant is equationally definable in an equational theory iff every model of the set of those consequences of the theory that do not contain the functional constant is uniquely extendible to a model of the theory itself.Sections three, four and five are devoted to applications and extensions of this result.Topics considered here include equational definability in first order logic, an extended notion of definability in equational logic and the synonymy of equational theories.The final two sections briefly review some of the history of equational logic 相似文献
876.
The current work, based on data from a cross-sectional sample of approximately 2,000 randomly selected university students, seeks to clarify exactly who is most likely to engage in online music piracy. The extant knowledgebase on why individuals take part in this form of intellectual property is growing, but little is known about the type and background of those involved. This study therefore seeks to construct a profile of the typical music pirate by measuring the salience of demographic characteristics and the respondent's scope of overall participation in cyberspace-based activities. Findings indicated that respondents’ differentially participated in music piracy based on their gender, race, type of college major, proficiency in using the Internet, and variety of online participation. Policy solutions based on an attempt to clearly specify, reinforce, and enforce definitions of appropriate Internet use are consequently suggested to reduce the prevalence of piracy among a university population. 相似文献
877.
George Wrisley 《Australasian journal of philosophy》2013,91(3):483-498
§258 of Wittgenstein's Philosophical Investigations is often seen as the core of his private language argument. While its role is certainly overinflated and it is a mistake to think that there is anything that could be called the private language argument, §258 is an important part of the private language sections of the Philosophical Investigations. As with so much of Wittgenstein's work, there are widely diverse interpretations of why exactly the private diarist's attempted ostensive definition fails. I argue for a version of the no-stage-setting interpretation of the failure of private ostension. On this interpretation, the reason why the diarist cannot establish a meaning for ‘S’ is that she lacks the conceptual-linguistic stage-setting needed to disambiguate the concentration of her attention (the private analogue of an ostensive definition). Thus, the problem with any subsequent use of ‘S’ is not that there is no criterion of correctness for remembering the meaning of ‘S’ correctly, or for re-identifying S correctly in the future. Rather, it is because of the initial failure to define ‘S’ that there is nothing that could count as a criterion of correctness for the future use of ‘S’; there is nothing to remember or re-identify. My argument for the no-stage-setting interpretation consists in showing how well it fits into the rest of the Philosophical Investigations and in defending it against objections from Robert J. Fogelin, Anthony Kenny, and most recently John V. Canfield. Kenny's and Canfield's objections are found to suffer from problems regarding memory scepticism. 相似文献
878.
879.
Five mothers of 50 newborn rat pups were maintained on either standard lab chow or a diet composed of the same chow with onion powder added. Taste preference tests administered during weaning indicated that the pups whose mother was fed the onion chow showed a preference for onion diet, but that such preference dissipated across the five day testing period. A control group of pups who were exposed to any onion diet cues available through channels other than the mother's milk did not show a preference for onion diet. It was concluded that exposure to onion taste in mother's milk was responsible for an initial preference for onion diet. 相似文献
880.