The dynamics of single populations up to ecosystems, are often described by one or a set of non-linear ordinary differential equations. In this paper we review the use of bifurcation theory to analyse these non-linear dynamical systems. Bifurcation analysis gives regimes in the parameter space with quantitatively different asymptotic dynamic behaviour of the system. In small-scale systems the underlying models for the populations and their interaction are simple Lotka-Volterra models or more elaborated models with more biological detail. The latter ones (...) are more difficult to analyse, especially when the number of populations is large. Therefore for large-scale systems the Lotka-Volterra equations are still popular despite the limited realism. Various approaches are discussed in which the different time-scale of ecological and evolutionary biological processes are considered together. (shrink)

This contribution is a gentle introduction to so-called dynamic epistemic logics, that can describe how agents change their knowledge and beliefs. We start with a concise introduction to epistemic logic, through the example of one, two and finally three players holding cards; and, mainly for the purpose of motivating the dynamics, we also very summarily introduce the concepts of general and common knowledge. We then pay ample attention to the logic of public announcements, wherein agents change their knowledge as the (...) result of public announcements. One crucial topic in that setting is that of unsuccessful updates: formulas that become false when announced. The Moore-sentences that were already extensively discussed at the conception of epistemic logic in Hintikka’s ‘Knowledge and Belief’ give rise to such unsuccessful updates. After that, we present a few examples of more complex epistemic updates. Our closing observations are on recent developments that link the ‘standard’ topic of belief revision, as in ‘On the Logic of Theory Change: partial meet contraction and revision functions’, by Alchourron et al. , to the dynamic epistemic logics introduced here. (shrink)

This contribution is a gentle introduction to so-called dynamic epistemic logics, that can describe how agents change their knowledge and beliefs. We start with a concise introduction to epistemic logic, through the example of one, two and finally three players holding cards; and, mainly for the purpose of motivating the dynamics, we also very summarily introduce the concepts of general and common knowledge. We then pay ample attention to the logic of public announcements, wherein agents change their knowledge as the (...) result of public announcements. One crucial topic in that setting is that of unsuccessful updates: formulas that become false when announced. The Moore-sentences that were already extensively discussed at the conception of epistemic logic in Hintikka’s ‘Knowledge and Belief ’ (1962) give rise to such unsuccessful updates. After that, we present a few examples of more complex epistemic updates. (shrink)

With this work, the author terminates his trilogy on nationally prominent philosophers in Germany, France, and the United States, respectively. In all three works a deliberate attempt is made to counter the current trend towards linguistic analysis and deal with philosophy in its classical meaning as a body of general truths about the universe as a whole, which the author believes leads to some important consequences of present day relevance. The style of the work, to say the least, is unusual (...) in that it is cast in the form of a series of letters, fourteen in number, of a father to his daughter. Since he admits there are no German, French, or American "philosophies," properly speaking, each letter deals with a particular North American philosopher, beginning with Jonathan Edwards, Benjamin Franklin, and Thomas Paine in Revolutionary days, continuing with Ralph Waldo Emerson, William James, Charles Sanders Peirce, Josiah Royce, John Dewey, and George Herbert Mead as 19th century representatives, and Whitehead, Santayana, and Carnap for the first half of the twentieth. The work concludes with Hans Kelsen and Marcuse, who like Carnap, came to the United States as the result of Hitler’s antisemitism. The tenor of the work lays stress on problems of cultural and political life and, thereby, on the ties of this sort that bind the United States and Europe. The work reads well, and although its tone is more biographical than philosophical, more expository than critical, it could well serve as supplementary reading for a seminar on American philosophy.—A.B.W. (shrink)

From what has been argued, it should now be apparent how Heidegger's philosophy of the affect, its ontological disclosures and its relation to authenticity might be enlarged to meet certain marxist challenges. The most valuable instruction to be gained from these citicisms, I think, is that which Lukacs offers in the example of Szilasi's intuition of co-presence. Traditional phenomenology needs to enrich its investigations into the social and historical reality of situation. Kosik's point that Heideggerian authenticity lacks the crucial third (...) step (revolutionary change of society) is also profound but again, not incompatiblein se with Heidegger's concept. Alternatively, one might as easily say that Critical Marxism or any Marxist Humanism can still be enriched by certain Heideggerian insights. (shrink)

The use of placebo as a control condition in clinical trials of major depressive disorder and anxiety disorders continues to be an area of ethical concern. Typically, opponents of placebo controls argue that they violate the beneficent-based, “best proven diagnostic and therapeutic method” that the original Helsinki Declaration of 1964 famously asserted participants are owed. A more consequentialist, oppositional argument is that participants receiving placebo might suffer enormously by being deprived of their usual medication(s). Nevertheless, recent findings of potential for (...) suicidality in young people treated with antidepressants, along with meta-analyses suggesting that antidepressants add no significant clinical benefit over placebos, warrant a re-evaluation of the arguments against placebo. Furthermore, the nature of placebo treatment in short-term clinical trials is often not well understood, and lack of understanding can foster opposition to it. This paper will show how scientific justifications for placebo use are morally relevant. The fundamental ethical importance of placebo controls is discussed in relation to several aspects of clinical trials, including detection of adverse events, accurate assessment of clinical benefit, advancing understanding of the heterogeneity of depression and anxiety disorders and respecting informed consent requirements. Prohibiting the use of placebo controls is morally concerning in that such prohibitions allow for the possibility of serious adverse public health consequences. Moral worries that research participants receiving placebo are being unduly jeopardised will be shown to be exaggerated, especially in relation to the net benefits for end-users to be gained from the quality of data resulting from using placebo controls. (shrink)

The late John Burrow, one of the most stimulating promoters of the distinctively interdisciplinary enterprise that is Intellectual History, was a vital member of what has become known as the ‘Sussex School’. In exploring the resonances of his singular and richly idiosyncratic contribution, this article places his unique historical sensibility within a series of interpretative contexts, demonstrating the vitality of writings that will continue to inspire and inform scholarship in the field for decades to come. ☆ The Sussex Centre for (...) Intellectual History Lecture delivered at the University of Sussex on 21st October, 2010. I am deeply indebted to Noël Sugimura for reading and commenting on an earlier version of the present essay with her customary sense and sensibility. (shrink)