A vast and interesting family of natural semantics for belief revision is defined. Suppose one is given a distance d between any two models. One may then define the revision of a theory K by a formula α as the theory defined by the set of all those models of α that are closest, by d, to the set of models of K. This family is characterized by a set of rationality postulates that extends the AGM postulates. The new postulates (...) describe properties of iterated revisions. (shrink)

A vast and interesting family of natural semantics for belief revision is defined. Suppose one is given a distance d between any two models. One may then define the revision of a theory K by a formula $\alpha$ as the theory defined by the set of all those models of $\alpha$ that are closest, by d, to the set of models of K. This family is characterized by a set of rationality postulates that extends the AGM postulates. The new postulates (...) describe properties of iterated revisions. (shrink)

A. Tarski [22] proposed the study of infinitary consequence operations as the central topic of mathematical logic. He considered monotonicity to be a property of all such operations. In this paper, we weaken the monotonicity requirement and consider more general operations, inference operations. These operations describe the nonmonotonic logics both humans and machines seem to be using when infering defeasible information from incomplete knowledge. We single out a number of interesting families of inference operations. This study of infinitary inference operations (...) is inspired by the results of [12] on nonmonotonic inference relations, and relies on some of the definitions found there. (shrink)

A. Tarski [21] proposed the study of infinitary consequence operations as the central topic of mathematical logic. He considered monotonicity to be a property of all such operations. In this paper, we weaken the monotonicity requirement and consider more general operations, inference operations. These operations describe the nonmonotonic logics both humans and machines seem to be using when infering dofeasible information from incomplete knowledge. We single out a number of interesting families of inference operations. This study of infinitary inference operations (...) is inspired by the results of [11] on finitary nonmonotonic operations, but this paper is self-contained. (shrink)

A. Tarski [22] proposed the study of infinitary consequence operations as the central topic of mathematical logic. He considered monotonicity to be a property of all such operations. In this paper, we weaken the monotonicity requirement and consider more general operations, inference operations. These operations describe the nonmonotonic logics both humans and machines seem to be using when infering defeasible information from incomplete knowledge. We single out a number of interesting families of inference operations. This study of infinitary inference operations (...) is inspired by the results of [12] on nonmonotonic inference relations, and relies on some of the definitions found there. (shrink)

The continuous ongoing mentation is experienced as dreams in some functional states. Mentation occurs with high speed, is driven by individual memory, and uses state-dependent processing strategies, context material, storage options, and retrieval access. Retrieval deserves more attention. Multiple state-shifts owing to individual meaning as extracted also during sleep concatenate dream narratives and define access to segments for awake recall. [Hobson et al.; Nielson; Solms].

The spread of evangelical Christianity across the globe is characterized by both a high degree of similarity in liturgy, symbolism and methods of organization and communication, and at the same time a remarkable ability to plug in to local indigenous rituals, symbols and practices related to possession and magic, to disease and healing. This poses complex questions for understanding ethnicity and also cultural globalization, which are explored using contemporary and historical sources relating to South and West Africa and to Brazil. (...) The ability of those evangelical churches which advertise their ability to transmit healing powers most insistently, to transpose healing from individual to community, to replace mystery with transparency, is set against their opportunistic and clientelistic political involvements and lack of transparency in their organization. (shrink)

For centuries Andean civilization and ecology has afforded a special fascination for European travellers and officials. In this volume, eight writers - anthropologists, economists and historians working in Bolivia, Britain, France, Ireland and Peru - describe and analyse aspects of rural society in various Andean regions. They focus on the impact of capitalist development on both the peasant economy and the landed elite in the Andes and the ways in which that impact has been shaped by a specific Andean culture (...) and a characteristic Andean ecology and climate. Their discussion of Andean specificity centres on the notion of verticality, first developed by John Murra to describe political and economic adaptation to climatic variation in the Andean eco-system. The volume represents a substantial contribution to our understanding of Andean rural society and the nature of the Latin American peasantry and peasant economy. It will appeal to all those interested in economic anthropology, Latin America, peasant studies and the capitalist world-economy. (shrink)

Socrates: A Life Worth Living traces the life and ideas of one of Western Civilization's founding philosophers, whose influence is still felt more than two thousand years later. Socrates is famous for how he died, executed by the Athenian government for corrupting the youth of Athens, but his most important contribution was to challenge the people around him to test their ideas and beliefs in conversation with each other, in the belief that in this way we could become a society (...) that knows the difference between truth and falsehood, and find what makes a life worthwhile. He did not claim to have definitive answers, but he knew that knowledge was the key to finding them, and he invited everyone he met to join him in his quest. (shrink)

A brilliant schoolboy in Amsterdam quickly learns to keep his ideas to himself. When he is twenty-three years old, those ideas prove so shocking and scandalous to his Jewish community that he is publicly denounced and expelled from his synagogue and neighborhood. The scandal shows no sign of waning as his ideas spread throughout seventeenth-century Europe, where he is almost universally reviled as an instrument of the devil. At the center of the storm, he lives the simplest of lives, quietly (...) devoted to his work as a lens grinder and to his steadfast search for truth--an endeavor that paves the way for all that is best in modern democracies. He does not live to see the results of his efforts, but his ideas change the world."--Provided by publisher. (shrink)