Karl Popper always claimed himself to be a realist. However, his constant denial to give definitions to the philosophical concepts, makes it difficult to understand what exactly he means by realism. This article focuses the attention on three meanings of Popper’s realism: a metaphysical, an epistemological and a sensible realism. The later sense can be rooted in the new studies on the ethical roots of all Popper’s philosophy.

Historical accounts of the work of J. J. Thomson find a contradiction in his work. On the one hand, he is presented as a Maxwellian theoretical physicist dealing with a typically Victorian entity, the ether. On the other hand, the analysis of his experimental work at the Cavendish seems to have little connection with his mathematical work. In this paper, I discuss the metaphysical views of J. J. Thomson, and argue that his deep belief in the ultimate continuity of matter (...) can be seen to give a framework to both his theoretical and his experimental work. His metaphysical beliefs were not in the least shaken by the discovery of discrete phenomena and entities, not even by his suggestion of the existence of corpuscles later known as electrons. His formation in Cambridge, together with some ideas that he acquired in his youth at Owens College, Manchester, are the key to understanding his metaphysics and the role it plays in his scientific work. (shrink)

ArgumentThe discovery of electron diffraction by George Paget Thomson in Aberdeen and Clinton J. Davisson and Lester H. Germer at the Bell Labs has often been portrayed as an example of independent discovery. Neither team was particularly interested in the developments of the nascent quantum theory but they both ended up demonstrating one of the most striking experimental consequences of the new physics. This paper traces the aftermath of this discovery and the way electron diffraction immediately turned from empirical evidence (...) of a highly novel theory into a technique for applied and technological research. Thomson was the first to design an “electron diffraction camera,” an instrument that soon found its place in laboratories around the world. I discuss the role played by Davisson and Germer, and by Thomson in the development of electron diffraction as a “research technology,” taking into account their specific institutional settings and research cultures. While Davisson and Germer remained in the industry-oriented Bell Labs, Thomson moved to Imperial College in 1930 where collaboration first, and competition later with George I. Finch was also relevant for the consolidation of an instrument that eventually became widely known as the “Finch Camera.”. (shrink)

Edmund T. Whittaker’s second edition of his A History of the Theories of Aether and Electricity is famous for his treatment of Einstein as an almost irrelevant character in the emergence of what he called “the relativity theory of Poincaré and Lorentz.” Historians of science have given a number of explanations, which include Whittaker’s scientific conservatism as an old classical physicist, his commitment to the ether, the pre-eminent role he attributed to mathematics over physics, and foundational philosophical disagreements, to name (...) a few. And in the background, often more implicit than forthright, the accusation of antisemitism looms over Whittaker. In this paper I intend to shed new light on this controversy by taking into consideration the abundant correspondence between Whittaker and his son preserved in the archives of the Fisher Library, University of Toronto. With it, we will get a more complex and personal view of the context in which his attempt at dethroning Einstein took place. Together with the abovementioned reasons, this correspondence shows that the problematic status quo of general relativity in the early 1950s, a period that has been described as the low-mark of general relativity, was very influential in the historical treatment he gave to Einstein. This is an aspect hardly mentioned in the historical work on this controversy and, from this correspondence, it appears to be central to understanding Whittaker at the time of drafting the new History. His possible antisemitic bias will also be addressed, though with the insufficient information on this subject the matter cannot be settled. (shrink)

ArgumentIn this paper I follow the demise of the ether in the first half of the twentieth century to show how the first obituaries of the ether were instrumental in creating an object with specific and largely simplified properties related to, but different from, nineteenth-century ethers. I suggest that writing the history of dead objects (or objects an author wants to be dead) is not epistemologically neutral but, on the contrary, it involves a reformulation of the object itself. I show (...) that this was indeed the case with the ether: those arguing for its demise in the early twentieth century tended to overlook as irrelevant one of the ether’s most important properties, namely being the seat for the transmission of electromagnetic waves. Instead, they emphasized the contradictions between other properties of previous ether(s), so as to advocate for its disappearance. (shrink)

El artículo presenta, analiza y comenta un texto de Arnau de Vilanova que se ha conservado relativo a la discusión que sostuvo este autor con los teólogos de París sobre la falacia del consecuente, en el contexto de la polémica escatológica . Los teólogos de París descalificaron la argumentación de Arnau de Vilanova porque incurría en la falacia del consecuente. Arnau de Vilanova se defiende de esta acusación.The article presents, analyzes and comments a text of Arnau de Vilanova that has (...) been conserved relative to the discussion that maintained this author with the theologians of Paris on the “fallacia consequentis”, in the context of the eschatological controversy . The theologians of Paris disqualified the argumentation of Arnau de Vilanova because he incurred the “fallacia consequentis”. Arnau de Vilanova defends himself of this accusation. (shrink)

This article delves into the reception of John W. Draper's History of the Conflict between Religion and Science in Spain. With two translations into Spanish appearing almost simultaneously in 1876, the conflict became a weapon in a long political dispute. The tensions between conservatives and liberals, between monarchists and republicans had the university and pedagogical reforms as one of the main battlefields. One of the chief reformist movements was informed by “Krausism,” an ideology that had academic freedom as one if (...) its central tenets. The similarities between the educational agenda of Draper and that of Krausists explain why the former's book resonated among members of the latter group. The article argues that in order to understand the reception of Draper in Spain, one should pay attention to the disputes about national identity and educational reforms, so as to place the so‐called conflict thesis in the context of opposing Spanish patriotisms. (shrink)

Research suggests that the ability to understand one’s own and others’ minds, or mentalizing, is a key factor for mental health. Most studies have focused the attention on the association between global measures of mentalizing and specific disorders. In contrast, very few studies have analyzed the association between specific mentalizing polarities and global measures of mental health. This study aimed to evaluate whether self and other polarities of mentalizing are associated with a multidimensional notion of mental health, which considers symptoms, (...) functioning, and well-being. Additionally, the level or depth of mentalizing within each polarity was also analyzed. A sample of 214 adolescents was evaluated on measures of self- and other- mentalizing, multi-informed measures of psychopathology and functioning based on Achenbach’s system, and measures of psychological well-being. Results revealed no association between mentalizing polarities and higher-order symptom factors. Self-mentalizing was associated with self-esteem and motivation to life goals, and other-mentalizing was associated to general, social and role functioning. This association between aspects of self-other mentalizing and self-other function has important implications for treatment and prevention. Deeper mentalizing within each polarity revealed stronger associations with functioning and well-being. Because mentalizing polarities are associated with functioning and well-being but not with symptoms, a new hypothesis is developed: mentalizing does not contribute to resiliency by preventing symptoms, but by helping to deal with them, thus improving functioning and well-being independently of psychopathology. These findings support that promoting mentalizing across development may improve mental health, even in non-clinical population. (shrink)

Karl Popper always claimed himself to be a realist. However, his constant denial to give definitions to the philosophical concepts, makes it difficult to understand what exactly he means by realism. This article focuses the attention on three meanings of Popper's realism: a metaphysical, an epistemological and a sensible realism. The later sense can be rooted in the new studies on the ethical roots of all Popper's philosophy.

This is an introduction to the thematic section on “The Historiography of Science and Religion in Europe,” which resulted from a symposium held at the eighth Conference of the European Society for the History of Science, University College London, UK, from September 14–17, 2018. The introduction provides a brief argument for the decentering of science and religion from the Anglo‐American discourse. It concludes by previewing the contributions of the section's essays.

Feature selection is a widely studied technique whose goal is to reduce the dimensionality of the problem by removing irrelevant features. It has multiple benefits, such as improved efficacy, efficiency and interpretability of almost any type of machine learning model. Feature selection techniques may be divided into three main categories, depending on the process used to remove the features known as Filter, Wrapper and Embedded. Embedded methods are usually the preferred feature selection method that efficiently obtains a selection of the (...) most relevant features of the model. However, not all models support an embedded feature selection that forces the use of a different method, reducing the efficiency and reliability of the selection. Neural networks are an example of a model that does not support embedded feature selection. As neural networks have shown to provide remarkable results in multiple scenarios such as classification and regression, sometimes in an ensemble with a model that includes an embedded feature selection, we attempt to embed a feature selection process with a general-purpose methodology. In this work, we propose a novel general-purpose layer for neural networks that removes the influence of irrelevant features. The Feature-Aware Drop Layer is included at the top of the neural network and trained during the backpropagation process without any additional parameters. Our methodology is tested with 17 datasets for classification and regression tasks, including data from different fields such as Health, Economic and Environment, among others. The results show remarkable improvements compared to three different feature selection approaches, with reliable, efficient and effective results. (shrink)

Gomes de Lisboa Escrito sobre as Questões Metafísicas de António André: Scriptum super Questiones Metaphisice Antonii AndreeEdição bilingue latim-português. Introdução, edição, tradução e notas Mário João CorreiaPorto: Edições Afrontamento, 195 p.ISBN 978-972-36-1839-6.