Sender–receiver games, first introduced by David Lewis ([1969]), have received increased attention in recent years as a formal model for the emergence of communication. Skyrms ([2010]) showed that simple models of reinforcement learning often succeed in forming efficient, albeit not necessarily minimal, signalling systems for a large family of games. Later, Alexander et al. ([2012]) showed that reinforcement learning, combined with forgetting, frequently produced both efficient and minimal signalling systems. In this article, I define a ‘dynamic’ sender–receiver game in which (...) the state–action pairs are not held constant over time and show that neither of these two models of learning learn to signal in this environment. However, a model of reinforcement learning with discounting of the past does learn to signal; it also gives rise to the phenomenon of linguistic drift. 1 Introduction2 Dynamic Signalling Games with Reinforcement Learning2.1 Introducing new states2.2 Swapping state–action pairs3 Discounting the Past3.1 Learning to signal in a dynamic world3.2 An unexpected outcome: linguistic drift4 ConclusionAppendix: A Markov Chain Analysis. (shrink)

To be free is to escape all limitations and obstacles—or so we think at first. But if we probe further, we discover that freedom embraces its own necessities, a set of conditions without which it could not exist. _Freedom's Embrace_ explores these necessities of freedom. J. Melvin Woody surveys competing conceptions of freedom and traces debates about the nature and reality of freedom to confusions about knowledge, humanity, and nature that are rooted in some of the most fundamental assumptions of (...) modern Western thought. The preemption of freedom as an exclusively human privilege with all nature relegated to mechanical necessity is a fatal error that renders both humanity and nature equally unintelligible. What distinguishes human beings from other animals is not freedom but the use of symbols, which vastly extends the range of available options and enables us to envision freedom as an ideal by which customary institutions and norms may be judged and transformed. By carefully surveying its necessary conditions and limitations, Woody reconciles the salient competing conceptions of freedom and weaves them together into a richer and broader theory that resolves old controversies and opens the way toward an ethics of freedom that can meet the challenges of relativism and nihilism that arise from recognizing the historicity and malleability of culture. (shrink)

Although the theory of definability had many important antecedents—such as the descriptive set theory initiated by the French semi-intuitionists in the early 1900s—the main ideas were first laid out in precise mathematical terms by Alfred Tarski beginning in 1929. We review here the basic notions of languages, explicit definability, and grammatical complexity, and emphasize common themes in the theories of definability for four important languages underlying, respectively, descriptive set theory, recursive function theory, classical pure logic, and finite-universe logic. We review (...) the history of previous studies of the similarities and differences in the theories of definability of the first three of these four languages. A seminal role leading toward unification of the theories has been played by the separation principles introduced by Nikolai Luzin in 1927. Emphasizing analogies and driving toward further unification embracing finite-universe logic we concentrate on a simple example—the first and second separation principles for existential-universal first-order sentences . Using this as a test case for the fundamental problem of how to “finitize” arguments in classical pure logic to the finite-universe case, we are led to the analogous negative solution by using the theory of certain special graphs: a graph is - special for any positive integers m , n , p , q iff it is bipartite with m red points and n blue points and for every p -tuple of red points there is a blue point to which they are all connected . As an aside we introduce for further study a natural “Ramseyesque” increasing sequence A of positive integers, where A is the least positive integer n for which an -special graph exists. (shrink)

This paper traces an expanded ethical perspective for youth and community work (YCW) practice in response to the climate and biodiversity crises. Discussing ecological ethics, we problematise the liberal humanist emphasis on utilitarianism and reject it as inappropriate for YCW in these times. Instead, we argue for an ecocentric practice ethic which intrinsically values the non-human world. To advance an ecocentric ethical perspective for YCW we draw on decolonial and posthuman theory. Inspired by a Freirean dialogical approach, we apply these (...) theoretical domains as lenses to problematise YCW practice, seeking a generative dialogue between perspectives. Through this, we identify three emergent tasks for ecocentric YCW: (a) thinking and acting beyond the individual; (b) cultivating reciprocal care and connection and (c) practicing critical pedagogies of place. This third element builds on YCW's social pedagogic tradition and provides a practical means to incorporate ecocentric ideas into practice. We conclude that, given the unprecedented implications of climate crises and biodiversity collapse, a YCW ethics that does not consider these implications for young people is insufficient for the context of practice today. Enacting an ecocentric YCW ethics requires ongoing collective praxis and dialogue between young people, practitioners, educators, managers and students. (shrink)

J. J. Valberg; VIII*—Improper Singular Terms, Proceedings of the Aristotelian Society, Volume 71, Issue 1, 1 June 1971, Pages 121–146, https://doi.org/10.1093/a.

In this paper, we describe Blackboard’s Online Journal program and explain how we use the online journal in a variety of philosophy courses. We outline our pedagogical motivation for using online journals and analyze how online journals help to improve our students’ ability to read, write and think philosophically. We analyze the strengths and weaknesses of online journals in comparison to online discussion boards. Finally, we address several concerns that philosophy teachers may have about using online journals.

Amit's Hebbian model risks being overexplanatory, since it does not depend on specific physiological modelling of cortical ANNs, but concentrates on those phenomena which are modelled by a large class of ANNs. While offering a strong demonstration of the presence of Hebb's “cell assemblies,” it does not offer an equal account of Hebb's “phase sequence” concept.

The American Society for Microbiology addresses issues of research integrity in several ways. There is a Code of Ethics for Society members and an Ethics Committee, a Publications Board has editorial oversight of ethical issues involved in Society journals and other publications, and the Public and Scientific Affairs Board is involved in ethical issues and scientific policies at the national level. In addition, the Society uses meetings and publications to inform and educate members about research integrity.

Anselm's argument has two distinct conclusions: (a) we cannot intelligibly doubt that god exists, and (b) this god, whose existence we cannot doubt, exists necessarily. if we replace anselm's vague conception of god by the spinozistic conception of substance, a defensible version of the ontological argument, understood as having these two conclusions, can be constructed. two important consequences of this analysis are: (1) the ontological argument, properly understood, deals simply with the concept of substance. it is a further question whether (...) substance ought to be understood as god. (2) the ontological argument does not actually demonstrate the existence of anything. it simply makes clear the consequences of adopting a metaphysical view which employs the spinozistic conception of substance. (shrink)