It has been shown that for the Reissner-Nordström solution to the vacuum Einstein field equations charge, like mass, has a unique space-time signature (Marsh, Found. Phys. 38:293–300, 2008). The presence of charge results in a negative curvature. This work, which includes a discussion of effective mass, is extended here to the Kerr-Newman solution.

Charge, like mass in Newtonian mechanics, is an irreducible element of electromagnetic theory that must be introduced ab initio. Its origin is not properly a part of the theory. Fields are then defined in terms of forces on either masses—in the case of Newtonian mechanics, or charges in the case of electromagnetism. General Relativity changed our way of thinking about the gravitational field by replacing the concept of a force field with the curvature of space-time. Mass, however, remained an irreducible (...) element. It is shown here that the Reissner-Nordström solution to the Einstein field equations tells us that charge, like mass, has a unique space-time signature. (shrink)

This book contains the material for a first course in pure model theory with applications to differentially closed fields.

This almost self-contained introduction to higher recursion theory is essential reading for all researchers in the field.

Over many centuries, the homing pigeon has been selectively bred for returning home from a distant location. As a result of this strong selective pressure, homing pigeons have developed an excellent spatial navigation system. This system passes through the hippocampal formation, which shares many striking similarities to the mammalian hippocampus; there are a host of shared neuropeptides, interconnections, and its role in the storage and manipulation of spatial maps. There are some notable differences as well: there are unique connectivity patterns (...) and spatial encoding strategies. This review summarizes the comparisons between the avian and mammalian hippocampal systems, and the responses of single neurons in several general categories: location and place cells responding in specific areas, path and goal cells responding between goal locations, context-dependent cells that respond before or during a task, and pattern, grid, and boundary cells that increase firing at stable intervals. Head-direction cells, responding to a specific compass direction, are found in mammals and other birds but not to date in pigeons. By studying an animal that evolved under significant adaptive pressure to quickly develop a complex and efficient spatial memory system, we may better understand the comparative neurology of neurospatial systems, and plot new and potentially fruitful avenues of comparative research in the future. (shrink)

Since locke, introspection has been generally defined as a form of observation. this is true, for example, of the classical tradition in psychology exemplified by wundt and titchener. recent experimental work by cognitive psychologists continues to treat introspection as a mode of observation while denying its alleged success in identifying cognitive processes. besides psychologists, philosophers such as james, ryle, and quinton are discussed, and they, too, define introspection as a type of observation analogous to perception. the present article calls attention (...) to other concepts of introspection that are important but that have figured less prominently in the history of philosophy and psychology. it is agreed here that, so far as the goals of self-knowledge and self-control are concerned, a concept of introspection other than that of observation is the significant one. explicating the nature of this alternative concept of introspection and its relevance for self-knowledge is the major aim of the article. (shrink)

This is the first comprehensive interpretive and critical analysis of the thought of one of America's foremost phiolosophers and psychologists- William James.

The notion of a weakly scattered theory T is defined. T need not be scattered. For each a model of T, let sr() be the Scott rank of . Assume sr() ≤ ω\sp A \sb 1 for all a model of T. Let σ\sp T \sb 2 be the least Σ₂ admissible ordinal relative to T. If T admits effective k-splitting as defined in this paper, then θσ\cal Aθ\cal A$ a model of T.

In _Bioethics in Context_, Gary Jones and Joseph DeMarco connect ethical theory, medicine, and the law, guiding readers toward a practical and legally grounded understanding of key issues in health-care ethics. This book is uniquely up-to-date in its discussion of health-care law and unpacks the complex web of American policies, including the Patient Protection and Affordable Care Act. Useful case studies and examples are embedded throughout, and a companion website offers a thorough, curated database of relevant legal precedents as (...) well as additional case studies and other resources. (shrink)

As fundamentalist religious thought strengthens its hold on U.S. politics and increases its role in politics around the world, enlightened values that form the very foundation of modern society are coming under attack. This essay explores some ramifications of these current conflicts.

This study explores linkages between what Chinese managers generally know about environmental issues, how strongly they value environmental protection, and different types of behaviours/actions they may take within their organizations on behalf of the environment. From a sample of 305 managers in Guangzhou and Beijing, it was found that both environmental knowledge and values are more predictive of more personal managerial behaviours, such as keeping informed of relevant company issues and working within the system to minimize environmental impacts, than more (...) overt behaviours. Moreover, for these more personal actions, environmental knowledge and values were found to have both main and interactive effects. By comparison, it was found that both environmental values and knowledge had additive effects on managerial tendencies to initiate new programs within their domain of responsibility. Only environmental values was found to have a modest influence environmental advocacy. (shrink)

Most explanations of beliefs are epistemically or pragmatically rationalizing. The distinction between these two types involves the explainer's differing expectations of how the believer will behave in the face of counter-evidence. This feature suggests that rationalizing explanations portray beliefs as either a consequence of the believer's following a norm, or part of a sub-intentional goal-oriented system. Which properly characterizes pragmatic believing? If there were pragmatic norms for believing, I argue, they would not be consciously followable. Yet an unallowable norm is (...) not a norm at all, and so I conclude that there are no such norms and that pragmatic believing is a sub-intentional, and not a norm-driven, process. /// La mayoría de las explicaciones de las creencias racionalizan de forma epistémica o pragmática. La distinción entre estas dos involucra las diferentes expectativas del que explica acerca de cómo se comportará el creyente frente a evidencia contraria. Este rasgo sugiere que las explicaciones racionalizadoras toman las creencias o bien como una consecuencia de que el creyente siga una norma, o bien como parte de su sistema subintencional orientado a fines. ¿Cuàl caracteriza de manera apropiada el creer pragmático? Aquí argumento que si hubiera normas pragmáticas para creer, no se podrían seguir conscientemente; sin embargo, una norma no seguible no es una norma en ningún sentido, por lo que concluyo que no existen tales normas y que el creer pragmático es un proceso subintencional y no un proceso guiado por normas. (shrink)

Dark comedies invite us to laugh at something which is, at least ostensibly, not funny at all. They take an act or event that would, under most descriptions or presentations, invite pity or anger, and give it characteristics that invite amusement. It is essential to the humour of the kidnapping in The King of Comedy that it is a kidnapping. The immorality of this event is crucial to its humour.

Because higher education brings members of academic communities in direct contact with students, the reflective higher education student is in an excellent position for developing two important intellectual virtues: confidence and humility. However, academic communities differ as to whether their members reach consensus, and their teaching practices reflect this difference. In this essay, Ward Jones argues that both consensus‐reaching and non‐consensus‐reaching communities can encourage the development of intellectual confidence and humility in their students, although each will do so in (...) very different ways. (shrink)

The lambda model of servocontrol seems superior to the alpha model in terms of dealing with the mechanical complexities of nonlinear and multiarticular muscles. Both, however, can be trivialized by noting that the “control variable” may simply be the sum of descending influences at propriospinal interneurons in the case of the lambda model or in the muscles themselves in the case of the alpha model. The notion that the brain explicitly computes output in terms of any such control variables may (...) be an engineering metaphor, useful for conceptual understanding but not for generating predictive hypotheses about higher motor circuitry. (shrink)

This paper investigates the characteristics of firms which have underrepresented groups in top management positions and those which do not. It is argued that profiles of these characteristics will be different for firms with minorities vs. women and that these profiles will be different depending on whether representation is by board membership or through officerships. A discriminant analysis found both similarities and differences in variables that were associated with these different forms of representation. It was found, for example, that size (...) is associated with representation for both minorities and women, whereas high advertising intensity is associated with firms with women on board, but not as officers. Other findings and the implications of the study are discussed. (shrink)

Contents: Recursive Enumerability and the Jump Operator; On the Degrees Less Than 0'; A Simple Set Which Is Not Effectively Simple; The Recursively Enumerable Degrees Are Dense; Metarecursive Sets (with G Kreisel); Post's Problem, Admissible Ordinals and Regularity; On a Theorem of Lachlan and Marlin; A Minimal Hyperdegree (with R O Gandy); Measure-Theoretic Uniformity in Recursion Theory and Set Theory; Forcing with Perfect Closed Sets; Recursion in Objects of Finite Type; The a-Finite Injury Method (with S G Simpson); Remarks Against (...) Foundational Activity; Countable Admissible Ordinals and Hyperdegrees; The 1-Section of a Type n Object; The k-Section of a Type n Object; Post's Problem, Absoluteness and Recursion in Finite Types; Effective Bounds on Morley Rank; On the Number of Countable Models; Post's Problem in E-Recursion; The Limits of E-Recursive Enumerability; Effective Versus Proper Forcing. (shrink)