John Bell showed that a big class of local hidden-variable models stands in conflict with quantum mechanics and experiment. Recently, there were suggestions that empirically adequate hidden-variable models might exist which presuppose a weaker notion of local causality. We will show that a Bell-type inequality can be derived also from these weaker assumptions. IntroductionThe EPR-Bohm experimentLocal causalityBell's inequality from separate common causes4.1 A weak screening-off principle4.2 Perfect correlation and ‘determinism’4.3 A minimal theory for spins4.4 No conspiracyDiscussion.

In the light of recent discussions we present the main results of our project, the aim of which was to derive a Bell-type inequality from the weakest possible assumptions. A principal outcome of the project is that a Bell-type inequality can be derived from the assumption of separate common causes (Graßhoff, Portmann and Wüthrich 2005), even without the assumption of perfectly anticorrelating event types (Portmann and Wüthrich 2007). We also address the critique that in Graßhoff et al. (2005) we implicitly (...) assume a common common cause (Hofer-Szabó forthcoming). (shrink)

Paul Engelmann hat über zwanzig Jahre seines Lebens an einer systematischen Darstellung der Psychologie mittels einer von ihm entwickelten graphischen Methode gearbeitet. Das Resultat dieser Arbeit bildet seine Psychologie graphisch dargestellt, die sich in seinem Nachlaß befindet. In diesem Werk will Engelmann die Klärung geistiger Aufgabengebiete, wie sie seine Lehrer Karl Kraus, Adolf Loos und Ludwig Wittgenstein betrieben haben, in der Psychologie fortsetzen. Hierbei fiihrt er Freuds Methode weiter, psychische Erscheinungen räumlich darzustellen, und wendet die Bildtheorie Wittgensteins auf seine Theorie (...) psychischer Vorgänge an. (shrink)

Paul Engelmann hat über zwanzig Jahre seines Lebens an einer systematischen Darstellung der Psychologie mittels einer von ihm entwickelten graphischen Methode gearbeitet. Das Resultat dieser Arbeit bildet seine Psychologie graphisch dargestellt, die sich in seinem Nachlaß befindet. In diesem Werk will Engelmann die Klärung geistiger Aufgabengebiete, wie sie seine Lehrer Karl Kraus, Adolf Loos und Ludwig Wittgenstein betrieben haben, in der Psychologie fortsetzen. Hierbei fiihrt er Freuds Methode weiter, psychische Erscheinungen räumlich darzustellen, und wendet die Bildtheorie Wittgensteins auf seine Theorie (...) psychischer Vorgänge an. (shrink)

Ludwig Wittgenstein refers to Heinrich Hertz as one of his major influences. However, up to now it was not clear from where he acquired his knowledge of mechanics and in which way it contributed to his philosophy. The aim of this book is to answer these questions. It shows that Wittgenstein came in contact with Hertz’s physical world view during his studies in Berlin. It had an effect on his view of the natural sciences in the Tractatus, and Hertz's conception (...) of mass-particles led to its central notion of a simple object. It was especially Wittgenstein’s teacher in Berlin, Joseph Petzoldt, who played an important intermediary role. The manuscript of his 1907 course of lectures "Grundbegriffe der Mechanik" is published here for the first time. It is complemented by reprints of related texts on the topic by Neumann, Lange and Petzoldt. (shrink)