The fine structure constant α ≡ e2/ c ≈ 1/137 is one of the fundamental parameters of the standard model of particle physics. There is a long history of attempts to derive the measured value of α from an underlying theory, or exhibit it in the form of a compact mathematical expression [2–4, 6, 8, 14–16]. The most significant advance in this endeavour was made by Dirac, who showed that if magnetic monopoles exist, with magnetic charge μ, then..

When K. Grue-Sørensen became a professor of pedagogy at the University of Copenhagen in 1955, he was inline with the dominant historical-hermeneutical approach to humanities. From the late 1960s until retirementin 1974, his approach was challenged by both technical and critical alternatives. Both these alternative havesince grown steadily, while the historical-hermeneutical view has been in the defensive. But Grue-Sørensenand the tradition he represented have three signifi cant points for today’s pedagogy, whether it is technicalor critical: pedagogy can and should not (...) deliver effi ciency technology, pedagogy should as far as possible useeveryday language, and fi nally that the educational history can make us wiser. (shrink)

A recent no-go theorem (Frauchiger and Renner in Nat Commun 9(1):3711, 2018) establishes a contradiction from a specific application of quantum theory to a multi- agent setting. The proof of this theorem relies heavily on notions such as ‘knows’ or ‘is certain that’. This has stimulated an analysis of the theorem by Nurgalieva and del Rio (in: Selinger P, Chiribella G (eds) Proceedings of the 15th international conference on quantum physics and logic (QPL 2018). EPTCS 287, Open Publishing Association, Waterloo, (...) 2018), in which they claim that it shows the “[i]nadequacy of modal logic in quantum settings” (ibid.). In this paper, we will offer a significantly extended and refined reconstruction of the theorem in multi-agent modal logic. We will then show that a thorough reconstruction of the proof as given by Frauchiger and Renner requires the reflexivity of access relations (system T). However, a stronger theorem is possible that already follows in serial frames, and hence also holds in systems of doxastic logic (such as KD45). After proving this, we will discuss the general implications for different interpretations of quantum probabilities as well as several options for dealing with the result. (shrink)

The aim of this series is to inform both professional philosophers and a larger readership (of social and natural scientists, methodologists, mathematicians, students, teachers, publishers, etc. ) about what is going on, who's who, and who does what in contemporary philosophy and logic. PROFILES is designed to present the research activity and the resuits of already outstanding personalities and schools and of newly emerging ones in the various fields of philosophy and logic. There are many Festschrift volumes dedicated to various (...) philosophers. There is the celebrated Library of Living Philosophers edited by P. A. Schilpp whose format influenced the present enterprise. Still they can only cover very fittle of the contemporary philosophical scene. Faced with a tremendous expansion of philosophical information and with an almost frightening division of labor and increasing specialization we need systematic and regular ways of keeping track of what happens in the profession. PROFILES is intended to perform such a function. Each volume is devoted to one or several philosophers whose views and results are presented and discussed. The profiled philosopher(s) will summarize and review his (their) own work in the main fields of signifi cant contribution. This work will be discussed and evaluated by invited contributors. Relevant historical and/or biographical data, an up-to-date bibliography with short abstracts of the most important works and, whenever possible, references to significant reviews and discussions will also be included. (shrink)

The aim of this series is to inform both professional philosophers and a larger readership (of social and natural scientists, methodologists, mathematicians, students, teachers, publishers, etc. ) about what is going on, who's who, and who does what in contemporary philosophy and logic. PROFILES is designed to present the research activity and the results of already outstanding personalities and schools and of newly emerging ones in the various fields of philosophy and logic. There are many Festschrift volumes dedicated to various (...) philosophers. There is the celebrated Library oj Living Phi/osophers edited by P. A. Schilpp whose format influenced the present enterprise. Still they can only cover very little of the contemporary philosophical scene. Faced with a tremendous expansion of philosophical information and with an almost frightening division of labor and increasing specialization we need systematic and regular ways of keeping track of wh at happens in the profession. PRO FILES is intended to perform such a function. Each volume is devoted to one or several philosophers whose views and results are presented and discussed. The profiled philosopher(s) will summarize and review his (their) own work in the main fields of signifi cant contribution. This work will be discussed and evaluated by invited contributors. Relevant historical and/or biographical data, an up-to date bibliography with short abstracts of the most important works and, whenever possible, references to significant reviews and discussions will also be included. (shrink)

The aim of this series is to inform both professional philosophers and a larger readership (of social and natural scientists, methodologists, mathematicians, students, teachers, publishers, etc.) about what is going on, who's who, and who does what in contemporary philosophy and logic. PROFILES is designed to present the research activity and the results of already outstanding personalities and schools and of newly emerging ones in the various fields of philosophy and logic. There are many Festschrift volumes dedicated to various philosophers. (...) There is the celebrated Library of Living Philosophers edited by P.A. Schilpp whose format influenced the present enterprise. Still they can only cover very little of the contemporary philosophical scene. Faced with a tremenƯ dous expansion of philosophical information and with an almost frightenƯ ing division of labor and increasing specialization we need systematic and regular ways of keeping track of what happens in the profession. PROƯ FILES is intended to perform such a function. Each volume is devoted to one or several philosophers whose views and results are presented and discussed. The profiled philosopher(s) will summarize and review his (their) own work in the main fields of signifiƯ cant contribution. This work will be discussed and evaluated by invited contributors. Relevant historical and/or biographical data, an up-to-date bibliography with short abstracts of the most important works and, whenever possible, references to significant reviews and discussions will also be included. (shrink)

Pv~P: Cambridge Journal of Undergraduate Philosophy, Issue 1, 1982.

Festschrift honoring P.F. Strawson; includes contributed articles on his contributions in logic and on logic.

This is a transcript of a conversation between P F Strawson and Gareth Evans in 1973, filmed for The Open University. Under the title 'Truth', Strawson and Evans discuss the question as to whether the distinction between genuinely fact-stating uses of language and other uses can be grounded on a theory of truth, especially a 'thin' notion of truth in the tradition of F P Ramsey.

Frank Plumpton Ramsey (1903-1930), Cambridge mathematician and philosopher, was one of the most brilliant people of his generation. He lived in an extraordinarily stimulating milieu, surrounded by figures such as Russell, Whitehead, Keynes, Moore, and Wittgenstein. Ramsey's highly original papers on the foundations of mathematics, probability, economics, philosophy of science and the theory of knowledge were very influential in the 20th century and are still widely discussed in the 21st.