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We introduce two new belief revision axioms: partial monotonicity and consequence correctness. We show that partial monotonicity is consistent with but independent of the full set of axioms for a Gärdenfors belief revision sytem. In contrast to the Gärdenfors inconsistency results for certain monotonicity principles, we use partial monotonicity to inform a consistent formalization of the Ramsey test within a belief revision system extended by a conditional operator. We take this to be a technical dissolution of the well-known Gärdenfors dilemma.In addition, we present the consequential correctness axiom as a new measure of minimal revision in terms of the deductive core of a proposition whose support we wish to excise. We survey several syntactic and semantic belief revision systems and evaluate them according to both the Gärdenfors axioms and our new axioms. Furthermore, our algebraic characterization of semantic revision systems provides a useful technical device for analysis and comparison, which we illustrate with several new proofs.Finally, we have a new inconsistency result, which is dual to the Gärdenfors inconsistency results. Any elementary belief revision system that is consequentially correct must violate the Gärdenfors axiom of strong boundedness (K*8), which we characterize as yet another monotonicity condition.This work was supported by the McDonnell Douglas Independent Research and Development program. 相似文献
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Data from a survey of 4591 16-19-year-olds from four parts of Britain demonstrate that a North-South divide is manifested both economically and politically. Southerners are materially better off and more supportive of the Conservative party. Adopting a social identity analysis of sectional effects, we hypothesized that party political support is a manifestation of identification with locality, and also that political support, rather than perceived deprivation, would be associated with intentions to stay in or move out of ones locality. Results revealed that Labour supporters in the north of England, and Conservative supporters in the south were most committed to their locality. In Scotland, where nationalism is more directly linked to political parties, those who supported the Scottish Nationalist Party or Labour Party identified more strongly with Scotland and had less intention to leave, but also perceived their situation as more disadvantaged than did Conservatives. These findings are interpreted as supporting a social identity approach to political support and geographical occupational mobility. We suggest that despite the apparent irrationality of self-denying perceptions and choices, these may also serve self-preserving functions in the longer term. 相似文献
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Royda Crose Donald R. Nicholas David C. Gobble Beth Frank 《Journal of counseling and development : JCD》1992,71(2):149-156
An expanded view of health is advocated for assessment and treatment of individual clients in helping them achieve and maintain their maximum potential for high-level wellness. In addition, moderating variables, such as culture, age, and gender differences, have an impact on every dimension of health and wellness. In this article a multidimensional systems model for wellness is described, and gender differences along those dimensions are reviewed. Application of the model and implications for counseling are discussed. Finally, two illustrative case examples, one man and one woman, are described. 相似文献