Voigt's 1887 explanation of the Michelson-Morley result as a Doppler effect using absolute space-time is examined. It is shown that Doppler effects involve two wave velocities: (1) the phase velocity, which is used to account for the Michelson-Morley null result, and (2) the velocity of energy propagation, which, being fixed relative to absolute space, may be used to explain the results of Roemer, Bradley, Sagnac, Marinov, and the 2.7° K anisotropy.

A many-valued (aka multiple- or multi-valued) semantics, in the strict sense, is one which employs more than two truth values; in the loose sense it is one which countenances more than two truth statuses. So if, for example, we say that there are only two truth values—True and False—but allow that as well as possessing the value True and possessing the value False, propositions may also have a third truth status—possessing neither truth value—then we have a many-valued semantics in the (...) loose but not the strict sense. A many-valued logic is one which arises from a many-valued semantics and does not also arise from any two-valued semantics [Malinowski, 1993, 30]. By a ‘logic’ here we mean either a set of tautologies, or a consequence relation. We can best explain these ideas by considering the case of classical propositional logic. The language contains the usual basic symbols (propositional constants p, q, r, . . .; connectives ¬, ∧, ∨, →, ↔; and parentheses) and well-formed formulas are defined in the standard way. With the language thus specified—as a set of well-formed formulas—its semantics is then given in three parts. (i) A model of a logical language consists in a free assignment of semantic values to basic items of the non-logical vocabulary. Here the basic items of the non-logical vocabulary are the propositional constants. The appropriate kind of semantic value for a proposition is a truth value, and so a model of the language consists in a free assignment of truth values to basic propositions. Two truth values are countenanced: 1 (representing truth) and 0 (representing falsity). (ii) Rules are presented which determine a truth value for every proposition of the language, given a model. The most common way of presenting these rules is via truth tables (Figure 1). Another way of stating such rules—which will be useful below—is first to introduce functions on the truth values themselves: a unary function ¬ and four binary functions ∧, ∨, → and ↔ (Figure 2).. (shrink)

Opstellen van een hoogleraar in de wijsbegeerte.

In this article, firstly, I begin by articulating four logically different positions Kant has been argued to hold concerning the nature and meaning of ‘aesthetic judgement’ so that, secondly, I may endorse the alternative that has been almost entirely neglected: that is, aesthetic judgement should be understood to be both ‘internalist’ in that the pleasure of taste is a constitutive element of the judgement itself (rather than its external effect or prior referent) and ‘objective’ insofar as the pleasure of taste (...) not only reflects the mental state of the judging subject but discriminates features or properties of the object judged. Ultimately I believe that this ‘internal objectivism’ is a compelling meta-aesthetic position in its own right with interesting parallels to recent trends in aesthetic theory, but presently I am concerned to demonstrate that one way to get clear about how such judgements are possible and to become comfortable with their significance is to see how this position arises and is resisted in the Critique of Judgment and, accordingly, in the contemporary scholarship on Kantian aesthetics. (shrink)

In this essay I propose to offer some observations in due course on how Christian thought and practice in general might profit from a central theme in the theology of Rāmānuja, a Tamil Vaisnava Brahmin whose traditional date straddles the eleventh and twelfth centuries of the Christian era. The central theme I have in mind is expressed in Rāmānuja's view that the ‘world’ is the ‘body’ of Brahman or God. We shall go on to explain what this means, but let (...) me state first that my overall aim is to further inter-religious understanding, especially between Christian and Hindu points of view. In professing a concern for inter-religious dialogue I know that I reflect a longstanding interest of Professor H. D. Lewis. I shall seek to show that the Christian religion can profit both from the content and the method of Rāmānuja's body-of-God theology. To this end this essay is divided into two sections. Section I is the longer: it contains an analysis of what Rāmānuja did mean by his body-of-God theme – doubtless unfamiliar ground for most of the readers of this essay – and serves as a propaedeutic for what follows in section 2. In section 2 I shall attempt to ‘extrapolate’ Rāmānuja's thinking into a Christian context, with dialogue in mind. Section 2 cannot be appreciated for the promise I hope it holds out without the detail of the first section. (shrink)

In this comment to Kehrer (2014) the relevance of atheistic argumentation in the domain of ethics as an important part of religion is sketched.

In spite of the seeming heterogeneity of topics in its title - Revolutions, Systems, and Theories - this volume purports to be something more than a random collection of Essays in Political Philosophy. The Colloquium of the Philosophy Department of the University of Western Ontario (29-31 Octo­ ber, 1971) at which initial versions of the first eight papers were delivered was entitled 'Political Theory'; and while the organizers anticipated and indeed welcomed topicality in the issues accorded priority arid in the (...) empirical evidence invoked, they were also hoping for a reasonably comprehensive explorat ion of some of the central issues of political philosophy. For this reason it was quickly decided that in such a field a philosophical focus on clarification of ordering concepts required the suppIement - and test - of researches into more particular subject maUers by social scientists. Thus, to speak in general terms (where the specializatlons and their taxonomies multi­ ply fissiparously!), contributors include political scientists, economists and sociologists (Barnard, Baston, Tullock, Rapoport) as well as philosophers (Scriven, Morgenbesser, Braybrooke, TayIor), and juxtaposed as proponents and commentators ·to generate exchanges across disciplinary frontiers. While the five additional invited papers are alI by professional philosophers, they extend the original Colloquium either by continuing controversy on its funda­ mental issues (e. g., Rubinoff, Nielsen, Roy) or by their continued explorations in what are acknowledged to be boundary areas (e. g., Schick, Wartofsky). The greatest topical emphasis is that on revolution. (shrink)

This paper deals with the axiomatizability problem for the matrix-based logics RMQ − and RMQ *. We present a Hilbert-style axiom system for RMQ −, and a quasi-axiomatization based on it for RMQ *. We further compare these logics to different well-known modal logics, and assess its status as relevance logics.

Der Atheismus erlebte in den letzten Jahren eine Renaissance. Durch verschiedene Publikationen wurde der Atheismus in der Offentlichkeit und in den Wissenschaften wieder zum Thema. Religioser Glaube sei mit einem wissenschaftlichen Weltbild nicht vereinbar, so viele Atheisten. Diese Bewegung fasst man unter dem Namen Neuer Atheismus zusammen. Aber ist tatsachlich etwas neu am neuen Atheismus? Gibt es in den modernen Naturwissenschaften noch einen Platz fur Gott? Konnen Argumente der neuen Atheisten uberzeugend zeigen, dass es unvernunftig und unwissenschaftlich ist, an die (...) Existenz eines Gottes zu glauben? Dies sind nur einige Beispielfragen, die die Autoren dieses Bandes versuchen werden zu beantworten. Die Autoren kommen aus unterschiedlichsten Disziplinen: Aus der Physik, der Biologie, der Mathematik, der Philosophie und der Theologie.". (shrink)