An elementary presentation is given of classical and relativistic collision dynamics based upon the principle of conservation of momentum. The concepts of mass are shown to be implicitly defined and their basic properties are rigorously derived and discussed. Luxons and tachyons are treated on the same footing as material particles.

We develop a process-based framework, articulating the escalation of difference between “private” self and “public” display as an alternative trajectory in the pursuit of authenticity to alignment and compromise. A parsimonious model presents an endogenous dynamic of binary choice that generates momentum toward polarization. The model is illustrated in the context of “black” metal – a branch of heavy metal music that appeared in Norway in the early 1990s, notorious for its involvement in criminal activities. Using fanzine data, we construct (...) a narrative of how a process of escalation led to innovation and transgression through self-selection and exclusion. The analysis addresses two related theoretical problems – what motivates actors to challenge normative scripts and “burn the bridges” to social acceptance, and why such challenges may prove more effective in achieving recognition than compromise. Examples from politics, culture and sports reinforce the importance of these problems. (shrink)

Six palimpsest folios – or, to be accurate, three bifolios – of the Verona manuscript, Biblioteca Capitolare XL, contain fragments of a Latin translation of Euclid's Elements: fols. 331v–r and 326v–r, 341r–v and 338r–v, 336r–v and 343r–v. The folios are dated to around a.d. 500, and the text is written in capital script in two columns. Unfortunately the folios have suffered severe damage from various chemical substances, which were used by nineteenth-century scholars in attempts to retrieve the underlying text. Nevertheless, (...) an edition of the fragments finally appeared in 1964 by M. Geymonat. (shrink)

Dans sa lecture de l'Hommage de Lacan à Marguerite Duras pour Le Ravissement de Lol V. Stein, Erik Porge met en évidence, cinquante ans après, l'actualité de ce texte où Lacan lie la problématique de la sublimation à celle d'une fiction clinique faisant cas. Il montre en effet que la transmission de la clinique de l'analyste participe de la dynamique de la sublimation de celui-ci. La topologie du fantasme, avec laquelle cette folie féminine - qui s'inscrit dans la suite (...) de Marguerite Anzieu (cas Aimée) et des soeurs Papin - est abordée, ouvre le lecteur à une dynamique transférentielle et de sublimation par son articulation à la pulsion. En même temps que Lacan parle de la sublimation, il est ravi par le texte et fait acte de sublimation dans l'écriture de son Hommage, en nouant l'objet de sa propre pulsion au Ravissement de Lol V. Stein et à Marguerite Duras elle-même. Dans un mouvement de retour sur sa lecture de ce texte, Lacan élève la lettre à la dignité de la Chose (définition de la sublimation) ; le style devient condition d'accès au cas et fait lui-même cas. (shrink)

We model the optimal copulation duration in the yellow dungflyScathophaga stercoraria, assuming that males optimize their reproductive success per day. The independent state-variables of a male are the actual sperm reserves, the female encounterrate and the time of the day. We used stochastic dynamic programming to predict the optimal copulation duration. The model predicts that copulation duration should increase (i) for larger males, (ii) for males with a better previous diet (iii) for males accepting more females (iv) for males staying (...) away from the dung during a whole day. It also predicts that (v) males on a restricted diet should accept fewer matings, (vi) testes size should shrivel during the day, (vii) the correlation coefficient between copulation duration and sequence number should decrease with increasing initial sperm reserve and with increasing number of copulations performed on a given day.There are two essential differences between our model and a model of Parker (1992). (i) Our model assumes that males optimize per day. Parker's model assumes that males optimize per mating bout, one bout comprising many days. (ii) Since all the important state variables depend only on the moment of the copulation, our model does not assume a long-time memory in dungflies, and it is more flexible than Parker's model. Overall, both models explain the data available equally well. (shrink)

"For at kunne leve og virke og for at kunne planlægge vort eget liv på længere sigt, må vi tage stilling til livets tre hovedproblemer: Hvad kan vi vide? Hvad tør vi håbe? Og hvad skal vi gøre? Det er netop disse problemer, de store filosoffer har tænkt igennem langt mere dybtgående og grundigt, end man sædvanligvis har mulighed for at gøre det." I en vis forstand er vi alle sammen filosoffer, for vi har alle et bestemt livssyn, om vi (...) er klar over det eller ej. Professor i filosofi Svend Erik Stybes bog beskriver ikke blot forskellige livssyn, som er opstået gennem filosofihistorien i løbet af de sidste mange århundreder. Han giver også en definition af begrebet livssyn, som de fleste vil kunne relatere til og få til at give mening i forhold til deres eget liv. Bogen "De store tænkere og vort livssyn" fra 1963 henvender sig til enhver, der har interesse for livets store og små spørgsmål og forskellige filosoffer og idéhistorikeres tilgang dertil. Svend Erik Stybe (1919-1995) var en dansk idéhistoriker og forfatter, der udgav et væld af bøger om både dansk og europæisk filosofi- og idéhistorie gennem de sidste mange hundrede år. Han skrev blandt andet bøger til brug i undervisning i idéhistorie på gymnasiet og universitetet, opslagsværker om filosofi og idéhistorie samt bøger om specifikke filosoffer som Jean-Jacques Rousseau, John Locke og Baruch de Spinoza. Svend Erik Stybe blev udnævnt til professor i filosofi ved Københavns Universitet i 1970, hvor han forblev frem til sin pension i 1989. (shrink)

As an extension of the well-known Action Description Language A introduced by M. Gelfond and V. Lifschitz [8] C. Baral and M. Gelfond recently defined the diafect AC which supports the description of concurrent actions [1]. Also, a sound but incomplete encoding of AC by means of an extended logic program was presented there. In this paper, we work on interpretations of contradictory inferences from partial action descriptions. Employing an interpretation different from the one implicitly used in AC, we present (...) a new dialect which allows to infer sound information from contradictory descriptions and to describe non-determinism and uncertainty. Furthermore, we give the first sound and complete encoding of AC, using equational logic programming, and extend it to as well. (shrink)

The author analyzes the inner structure of the philosophy of the Tractatus rather than its relation to the views of other philosophers.

In everyday life we often act adequately, yet without deliberation. For instance, we immediately obtain and maintain an appropriate distance from others in an elevator. The notion of normativity implied here is a very basic one, namely distinguishing adequate from inadequate, correct from incorrect, or better from worse in the context of a particular situation. In the first part of this paper I investigate such ‘situated normativity’ by focusing on unreflective expert action. More particularly, I use Wittgenstein’s examples of craftsmen (...) (tailors and architects) absorbed in action to introduce situated normativity. Situated normativity can be understood as the normative aspect of embodied cognition in unreflective skillful action. I develop Wittgenstein’s insight that a peculiar type of affective behaviour, ‘directed discontent’, is essential for getting things right without reflection. Directed discontent is a reaction of appreciation in action and is introduced as a paradigmatic expression of situated normativity. In the second part I discuss Wittgenstein’s ideas on the normativity of what he calls ‘blind’ rule-following and the ‘bedrock’ of immediate action. What matters for understanding the normativity of (even ‘blind’) rule-following, is not that one has the capacity for linguistic articulation or reflection but that one is reliably participating in a communal custom. In the third part I further investigate the complex relationships between unreflective skillful action, perception, emotion, and normativity. Part of this entails an account of the link between normativity at the level of the expert’s socio-cultural practice and the individual’s situated and lived normativity. (shrink)

Analyzing how Plotinus’ critical reception of the Aristotelian, Stoic and Middle-Platonist notions of 'that which depends on us' lead him to a highly original interpretation of the notion, this book shows the central role of this notion in the Plotinian account of human agency.

There are several theses in political science that are usually explicitly called ‘laws’. Other theses are generally thought of as laws, but often without being explicitly labelled as such. Still other claims are well-supported and arguably interesting, while no one would be tempted to call them laws. This situation raises philosophical questions: which theses deserve to be called laws and which not? And how should we decide about this? In this paper we develop and motivate a strategy for thinking about (...) laws in political science which integrates two core concepts: spatio-temporal stability and social mechanisms. The proposed strategy is a set of guidelines that political scientists can use to reflect on and argue about specific cases within their discipline, not a clear-cut demarcation criterion. We defend and motivate this strategy and apply it to two cases (one with respect to state repression, one about parliamentary elections). After we have developed and motivated our strategy for political science, we show that our proposal is relevant for other disciplines in the social sciences. We explain how our views fit into critical realism and embed them in the debate on laws in general philosophy of science and in the philosophy of the social sciences. (shrink)

C. S. Lewis is one of the most beloved Christian apologists of the twentieth century; David Hume and Bertrand Russell are among Christianity’s most important critics. This book puts these three intellectual giants in conversation with one another on various important questions: the existence of God, suffering, morality, reason, joy, miracles, and faith. Alongside irreconcilable differences, surprising areas of agreement emerge. Curious readers will find penetrating insights in the reasoned dialogue of these three great thinkers.

Logical pluralism is the view that there is more than one correct logic. Most logical pluralists think that logic is normative in the sense that you make a mistake if you accept the premisses of a valid argument but reject its conclusion. Some authors have argued that this combination is self-undermining: Suppose that L1 and L2 are correct logics that coincide except for the argument from Γ to φ, which is valid in L1 but invalid in L2. If you accept (...) all sentences in Γ, then, by normativity, you make a mistake if you reject φ. In order to avoid mistakes, you should accept φ or suspend judgment about φ. Both options are problematic for pluralism. Can pluralists avoid this worry by rejecting the normativity of logic? I argue that they cannot. All else being equal, the argument goes through even if logic is not normative. (shrink)

The concept of ecosystem services is a way of visualizing the instrumental value that nature has for human beings. Most ecosystem services can be performed by more than one species. This fact is sometimes used as an argument against the preservation of species. However, even though substitutability does detract from the instrumental value of a species, it also adds option value to it. The option value cannot make a substitutable species as instrumentally valuable as a non-substitutable species, but in many (...) cases, it can add enough value to make the species more valuable than the projects that threaten its existence. (shrink)

Angesichts der ökologischen Krise und der zunehmenden Zivilisationsprobleme ist es notwendig, einen philosophischen Naturbegriff, der das Verhältnis des Menschen zur Natur aufgrund dieser Tatsache neu bestimmt, zu entwickeln. Der Jesuit, Paläontologe und Philosoph Pierre Teilhard de Chardin (1881-1955) ist ein herausragendes Beispiel einer Vermittlung von Naturwissenschaft und Naturphilosophie. Teilhard entwirft eine Zusammenschau von transzendent-metaphysischer Teleologie, die aus dem christlichen Glauben heraus Gott als einzige Zweckursache des Geschehens sieht, philosophischer Anthropologie und naturwissenschaftlich orientierter kausalmechanischer Evolutionstheorie, dem allmählichen Entwickeln eines höheren Zustands (...) aus einem vorhergehenden. Die in der Ursache gegründeten Seinszusammenhänge ergeben einen vom Ziel her bestimmten Zusammenhang. Gott ist Totum alles wirklich Seienden im Horizont des möglichen Seins. Das für Teilhard so wichtige teleologische Prinzip hat seinen philosophiehistorischen Ursprung bei Aristoteles, der damit eine Denktradition begründete, die im Gegensatz zum kausal-mechanischen Weltbild der Naturwissenschaften steht und die sich über Thomas von Aquin und Hegel bis zu Teilhard als vorläufig letztem Höhepunkt erhält. Der aus Teilhards Naturphilosophie folgende Optimismus kann von großer Bedeutung für die Gegenwart sein. Er resultiert aus der Übernahme von Verantwortung für die Schöpfung und ist die ethische Konsequenz aus Naturfinalität und christlichem Universalismus. Der Autor: Erik Lehnert, geb. 1975 in Berlin. Studium der Philosophie, Geschichte sowie Ur- und Frühgeschichte in Berlin, z. Z. Promotion über die Aktualität der Philosophie von Karl Jaspers. 1995 bis 1997 Mitherausgeber von "Aletheia - Neues kritisches Journal der Philosophie, Theologie, Geschichte und Politik", Veröffentlichungen u.a. zur Philosophie des 19. Jahrhunderts. (shrink)

Erik Wielenberg has presented an objection to divine command theory (DCT) alleging that DCT has the troubling implication that psychopaths have no moral obligations. Matthew Flannagan has replied to Wielenberg’s argument. Here, I defend the view that, despite Flannagan’s reply, the psychopath objection presents a serious problem for the versions of DCT defended by its most prominent contemporary advocates — Robert Adams, C. Stephen Evans, and William Lane Craig.

Marxism: Crisis or Renewal? It has become commonplace nowadays to speak of a crisis— and even of the end— of Marxism. This dire forecast can hardly be ...