1 In 1954 Karl Popper published an article attempting to show that the identification of the quantitative concept degree of confirmation with the quantitative concept degree of probability is a serious error. The error was presumably committed by J. M. Keynes, H. Reichen bach and R. Carnap. 2 It was Popper's intention then, to expose the error and to introduce an explicatum for the prescientific concept of degree of confirmation. A few months later Y. Bar-Hillel published an article attempting to show that no serious error had been committed (particularly by Carnap) and that the problem introduced by Popper was simply a "verbal one. "3 Popper replied immediately that "Dr. Bar-Hillel forces me [Popper] now to criticize Carnap's theory further," and he [Popper] introduced further objections which, if accepted, destroy Carnap's theory. 4 About eight years after this exchange took place I was in graduate school at the University of Chicago in search of a topic for a doctoral dissertation. An investigation of the issues involved in this exchange seemed to be ideal for me because I had (and still have) a great ad miration for the work of both Carnap and Popper. A thoroughly revised and I hope improved account of that investigation appears in the first five chapters of this book. Put very briefly, what I found were four main points of contention.

This volume examines Popper’s philosophy by analyzing the criticism of his most popular critics: Thomas Kuhn, Paul Feyerabend and Imre Lakatos. They all followed his rejection of the traditional view of science as inductive. Starting from the assumption that Hume’s criticism of induction is valid, the book explores the central criticism and objections that these three critics have raised. Their objections have met with great success, are significant and deserve paraphrase. One also may consider them reasonable protests against Popper’s high standards rather than fundamental criticisms of his philosophy. The book starts out with a preliminary discussion of some central background material and essentials of Popper’s philosophy. It ends with nutshell representations of the philosophies of Popper. Kuhn, Feyerabend and Lakatos. The middle section of the book presents the connection between these philosophers and explains what their central ideas consists of, what the critical arguments are, how they presented them, and how valid they are. In the process, the author claims that Popper's popular critics used against him arguments that he had invented (and answered) without saying so. They differ from him mainly in that they demanded of all criticism that it should be constructive: do not stop believing a refuted theory unless there is a better alternative to it. Popper hardly ever discussed belief, delegating its study to psychology proper; he usually discussed only objective knowledge, knowledge that is public and thus open to public scrutiny.

Studie over de filosofie van de in Oostenrijk geboren Engelse wijsgeer (geb. 1902)

Despite the criticism of Karl Popper's falsifiability theory for the demarcation between science and non-science, mainly pseudo-science, this criterion is still very useful, and perfectly valid after it was perfected by Popper and his followers. Moreover, even in his original version, considered by Lakatos as "dogmatic", Popper did not assert that this methodology is an absolute demarcation criterion: a single counter-example is not enough to falsify a theory; a theory can legitimately be saved from falsification by introducing an auxiliary hypothesis. Compared to Kuhn's theory of revolutions, which he himself later dissociated from it transforming it into a theory of "micro-revolutions," I consider that Popper's demarcation methodology, along with the subsequent development proposed by him, including the corroboration and the verisimilitude, though imperfect, is not only valid today, but it is still the best demarcation methodology. For argumentation, I used the main works of Popper dealing with this issue, and his main critics and supporters. After a brief presentation of Karl Popper, and an introduction to the demarcation problem and the falsification methodology, I review the main criticisms and the arguments of his supporters, emphasizing the idea that Popper has never put the sign of equality between falsification and rejection. Finally, I present my own conclusions on this issue. Keywords: Karl Popper, falsifiability, falsification, demarcation problem, pseudo-science CONTENTS Abstract Introduction 1 The demarcation problem 2 Pseudoscience 3 Falsifiability 4 Falsification and refutation 5 Extension of falsifiability 6 Criticism of falsifiability 7 Support of falsifiability 8 The current trend Conclusions Bibliography Notes DOI: 10.13140/RG.2.2.22522.54725

This title is part of UC Press's Voices Revived program, which commemorates University of California Press’s mission to seek out and cultivate the brightest minds and give them voice, reach, and impact. Drawing on a backlist dating to 1893, Voices Revived makes high-quality, peer-reviewed scholarship accessible once again using print-on-demand technology. This title was originally published in 1974.

This book provides a comprehensive review of the works in the rapidly evolving field of neural networks and brain studies. Its purpose is two-fold: to help physicists entering this field to get a broader view of the context of the domain, and to help scientists of other disciplines to reach a better understanding of the physicists' contributions within a context of perspectives they can relate to.Included in the volume are 68 carefully selected, high quality reprints to provide the volume with both breadth and depth. It is organized into 5 sections and 22 chapters, both the sections and chapters being preceded by introductory comments by the editors.