Resumo: Em oposição à leitura de Friedrich Nietzsche, a do pessimismo leopardiano justificado como expressão de "decadência fisiológica" e Leopardi identificado com o "anjo decaído" romântico, defende-se, neste escrito, a leitura de Walter Benjamin que revela o aspecto revolucionário e prático de um "anjo irônico", conforme a designação benjaminiana. Empreende-se aqui um diálogo entre os argumentos de Benjamin, apresentados na sua resenha [Kritiken und Resenzionen - 1928] dos Pensieri leopardianos, e a obra de Leopardi, Canti e Zibaldone di pensieri: algo (...) necessário para esclarecer também o teor da sua "filosofia desesperada" e, igualmente, o seu aspecto de crítica do presente.Palavras-chave: pessimismo - anjo irônico - decadência fisiológica - filosofia desesperada.: This work supports Walter Benjamin's understanding, which reveals the revolutionary and practical aspects of the "ironical angel" according to Benjamin's designation, as opposed to Friedrich Nietzsche's judgement of the leopardian pessimism justified as the expression of physiologic decadence, and Leopardi identified as a "decayed romantic angel". Here a dialogue is endeavored between Benjaminian arguments, presented on his leopardian Pensieri digest [Kritiken und Resenzionen], and Leopardi's work, Canti e Zibaldone di pensieri: something necessary to enlighten the contents of his "desperate philosophy" , as well as, the aspects of his critique of the present. (shrink)

A presente dissertação objetivou investigar as relações entre a Naturologia no Brasil e o movimento da Nova Era, partindo da hipótese levantada por Teixeira de que o surgimento da Naturologia no Brasil estaria relacionado à chegada da Nova Era ao país. Para tanto, foram aplicados 292 questionários em naturólogos formados nas duas universidades brasileiras com cursos de Naturologia reconhecidos pelo MEC. Para aferir o grau de adesão ao movimento da Nova Era, uma escala do tipo Likert foi aplicada, com (...) 25 itens referentes às grandes tendências do movimento da Nova Era ressaltadas por Hanegraaff. Os resultados demonstraram que 51,7% dos naturólogos consideram-se objetivamente novaeristas, e que os naturólogos atuantes são justamente os que demonstram o maior grau de identificação com esse título. Também foi atestado que o grau de adesão da escala do tipo Likert foi alto em todas as categorias, com médias superiores a 3. (shrink)

Populism is widely thought to be in tension with liberal democracy. This article clarifies what exactly is problematic about populism from a liberal–democratic point of view and goes on to develop normative standards that allow us to distinguish between more and less legitimate forms of populism. The point of this exercise is not to dismiss populism in toto; the article strives for a more subtle result, namely, to show that liberal democracy can accommodate populism provided that the latter conforms to (...) particular discursive norms. What the article calls a ‘liberal ethics of populism’ turns out to be closely bound up with a broader ethics of peoplehood, understood as a way of articulating who ‘the people’ are in a way that is compatible with liberal–democratic principles of political justification. Such an ethics, concludes the article, inevitably has a much wider audience than populist political actors: its addressees are all those who seek legitimately to exercise power in the name of the people. (shrink)

Focused on city-scale automation, and using self-driving cars (SDCs) as a case study, this article reflects on the role of AI—and in particular, computer vision systems used for mapping and navigation—as a catalyst for urban transformation. Urban research commonly presents AI and cities as having a one-way cause-and-effect relationship, giving undue weight to AI’s impact on cities and overlooking the role of cities in shaping AI. Working at the intersection of data science and social research, this paper aims to counter (...) this trend by exploring the reverse perspective: how do cities affect the development, and expose the present limits, of SDCs? The contribution of this paper is threefold. First, by comparing urban and nonurban environments and thoroughly examining the relationship between computer vision and city-specific sociality and form, it defines machine autonomy/automation as a function of the sociotechnical milieu in which an AI system operates. Second, and related, the paper problematizes the notion of SDCs as autonomous technologies and the role it plays in envisioning contending policy arrangements and technical solutions for achieving full driving automation. Finally, the article offers insight into a materialist and spatialized understanding of AI—namely, not as an abstract quality susceptible to replication within discrete machines, but rather as a distributed property emerging through embodied interactions among a multiplicity of agents (human, non-human, and technological) within/with their environments. (shrink)

In a recent paper, Pruss proves the validity of the rule beta-2 relative to Lewis’s semantics for counterfactuals, which is a significant step forward in the debate about the consequence argument. Yet, we believe there remain intuitive counter-examples to beta-2 formulated with the actuality operator and rigidified descriptions. We offer a novel and two-dimensional formulation of the Lewisian semantics for counterfactuals and prove the validity of a new transfer rule according to which a new version of the consequence argument can (...) be formulated. This new transfer rule is immune to the counter-examples involving the actuality operator and rigidified descriptions. However, we show that counter-examples to this new rule can also be generated, demanding that the Lewisian semantics be generalized for higher dimensions where counter-examples can always be generated. (shrink)

Popular sovereignty requires that citizens perceive themselves as being able to act and implement decisions, and that they are de facto causally connected to mechanisms of decision making. I argue that the two most common understandings of the exercise of popular sovereignty—which center on direct decision making by the people as a whole and the indirect exercise of democratic agency by elected representatives, respectively—are inadequate in this respect, and go on to suggest a complementary account that stresses the central role (...) of internally democratic and participatory political parties in actualising popular sovereignty, drawing on the democratic theory of Hans Kelsen. (shrink)

Populism is widely thought to be in tension with liberal democracy. This article clarifies what exactly is problematic about populism from a liberal–democratic point of view and goes on to develop...

Populist movements have become key players in European politics. These movements are readily criticized by journalists or political rivals, yet none of the common objections to populism seems to arrest their success. This article turns to normative political theory to cultivate sensitivity to problems arising from some existing arguments against populism, and to explore possible alternatives. It offers a critical reading of prototypical liberal and conservative arguments against populism, and proposes that the principles of solidarity and procedure provide good grounds (...) for a sustainable critique of populism. (shrink)

Ao dar conta da sua obra global de Paul Ricoeur, o presente estudo, em forma de glosa filosófica, busca apresentar os 'mundos do homem' sob o signo da relação de ipseidade e alteridade, da ipseidade colhida como 'identidade reflexiva' e da alteridade apreendida nos múltiplos registos filosoficamente permitidos. Para concretizar este objectivo são exploradas a Psicologia e Psicanálise, a História, a Linguagem e a Filosofia Prática, terminando a investigação com uma conclusão aporética sobre a ontologia em jogo.

There are three main accounts of scientific progress: 1) the epistemic account, according to which an episode in science constitutes progress when there is an increase in knowledge; 2) the semantic account, according to which progress is made when the number of truths increases; 3) the problem-solving account, according to which progress is made when the number of problems that we are able to solve increases. Each of these accounts has received several criticisms in the last decades. Nevertheless, some authors (...) think that the epistemic account is to be preferred if one takes a realist stance. Recently, Dellsén proposed the noetic account, according to which an episode in science constitutes progress when scientists achieve increased understanding of a phenomenon. Dellsén claims that the noetic account is a more adequate realist account of scientific progress than the epistemic account. This paper aims precisely at assessing whether the noetic account is a more adequate realist account of progress than the epistemic account. (shrink)

In a recent article, P. Roger Turner and Justin Capes argue that no one is, or ever was, even partly morally responsible for certain world-indexed truths. Here we present our reasons for thinking that their argument is unsound: It depends on the premise that possible worlds are maximally consistent states of affairs, which is, under plausible assumptions concerning states of affairs, demonstrably false. Our argument to show this is based on Bertrand Russell’s original ‘paradox of propositions’. We should then opt (...) for a different approach to explain world-indexed truths whose upshot is that we may be morally responsible for some of them. The result to the effect that there are no maximally consistent states of affairs is independently interesting though, since this notion motivates an account of the nature of possible worlds in the metaphysics of modality. We also register in this article, independently of our response to Turner and Capes, and in the spirit of Russell’s aforementioned paradox and many other versions thereof, a proof of the claim that there is no set of all true propositions one can render false. (shrink)

Purpose This study aims to explore whether face recognition technology – as it is intensely used by state and local police departments and law enforcement agencies – is racism free or, on the contrary, is affected by racial biases and/or racist prejudices, thus reinforcing overall racial discrimination. Design/methodology/approach The study investigates the causal pathways through which face recognition technology may reinforce the racial disproportion in enforcement; it also inquires whether it further discriminates black people by making them experience more racial (...) discrimination and self-identify more decisively as black – two conditions that are shown to be harmful in various respects. Findings This study shows that face recognition technology, as it is produced, implemented and used in Western societies, reinforces existing racial disparities in stop, investigation, arrest and incarceration rates because of racist prejudices and even contributes to strengthen the unhealthy effects of racism on historically disadvantaged racial groups, like black people. Practical implications The findings hope to make law enforcement agencies and software companies aware that they must take adequate action against the racially discriminative effects of the use of face recognition technology. Social implications This study highlights that no implementation of an allegedly racism-free biometric technology is safe from the risk of racially discriminating, simply because each implementation leans against our society, which is affected by racism in many persisting ways. Originality/value While the ethical survey of biometric technologies is traditionally framed in the discourse of universal rights, this study explores an issue that has not been deeply scrutinized so far, that is, how face recognition technology differently affects distinct racial groups and how it contributes to racial discrimination. (shrink)

It is a widely held principle that no one is able to do something that would require the past to have been different from how it actually is. This principle of the fixity of the past has been presented in numerous ways, playing a crucial role in arguments for logical and theological fatalism, and for the incompatibility of causal determinism and the ability to do otherwise. I will argue that, assuming bivalence, this principle is in conflict with standard views about (...) knowledge and the semantics for ‘actually’. I also consider many possible responses to the argument. (shrink)

In recent times, representation theory has become one of the most productive and interesting sub-fields in democratic theory. Arguably, the most important theoretical innovation are the so-called ‘constructivist’ approaches to political representation. These approaches play a central role in Creating Political Presence: The New Politics of Democratic Representation and The Constructivist Turn in Political Representation, two impressive volumes that take stock of the state of the art in representation theory. I discuss the two volumes by focusing on three broader and (...) interconnected themes: the problem that constructivism is meant to respond to, the tendency of representation theorists to expand the possibilities of representation as broadly as possible, and the normative aspects of political representation and how constructivists deal with them. (shrink)

In recent times, representation theory has become one of the most productive and interesting sub-fields in democratic theory. Arguably, the most important theoretical innovation are the so-called ‘constructivist’ approaches to political representation. These approaches play a central role in Creating Political Presence: The New Politics of Democratic Representation and The Constructivist Turn in Political Representation, two impressive volumes that take stock of the state of the art in representation theory. I discuss the two volumes by focusing on three broader and (...) interconnected themes: the problem that constructivism is meant to respond to, the tendency of representation theorists to expand the possibilities of representation as broadly as possible, and the normative aspects of political representation and how constructivists deal with them. (shrink)

Resumen En este artículo se reflexiona sobre la relación entre literatura y enfermedad, concentrando la atención en la perspectiva de Kierkegaard y de Kafka. Después de analizar la postura kierkegaardiana se pasa a la kafkiana y, finalmente, se comparan los resultados obtenidos. De este modo, se pueden apreciar las diferencias entre los dos planteamientos y, sucesivamente, utilizar los elementos en común para esbozar unas características interesantes sobre la relación entre literatura y enfermedad en los siglos XIX y XX en el (...) contexto de influencia alemana. Esto nos lleva a reflexionar sobre las conexiones causales entre la enfermedad y la literatura, y sobre el contexto social o íntimo en el cual estas se desarrollan.I analyze the topic of sickness in relation to 19th and 20th Century Literature in the Germanophile area. In particular, I examine Kierkegaard's and Kafka's perspectives. In the case of Kierkegaard, he principally wrote about sickness in his diaries, and in two important books: The Concept of Anxiety and The Sickness unto Death. However, Kafka wrote about the same theme in all his diaries. Therefore, in this study, I will compare the different perspectives of these two authors in relation to both sickness and literature. Through this, I will attempt to extract any key aspects that can be used for identifying a more general relation between sickness and literature in the 19th and 20th Centuries. To achieve this aim, I will firstly scrutinize Kierkegaard's posture, and then Kafka's posture. Following this, I will compare the findings to draw general conclusions. (shrink)

La complessità dei rapporti tra oggetto mentale, realtà storica e rappresentazione storiografica appare evidente, quando taluni film di fantascienza ripropongono discussioni teoriche, alcune delle quali dal forte sapore medievale, in atmosfere medievali collocate nel futuro.

O avanço técnico gerou disparidades ligadas ao campo da informática, algumas empresas aprisionaram o conhecimento através de senhas, licenças e direitos autorais, induzindo a sociedade civil a ficar refém desse processo de exploração comercial e criando uma divisão entre a comunidade de técnicos ligados a computação. Surge o Movimento Software Livre-MSL, em prol da criação, uso e difusão de softwares alternativos e cooperativos, uma nova forma de ação coletiva que visa romper com o sistema econômico vigente utilizando-se do potencial das (...) redes, principalmente da Internet, pois teve sua divulgação e propagação através da Internet por meio da cooperação mútua entre profissionais ligados a informática e alcançou vários segmentos da sociedade civil. Partindo dessas considerações, esse artigo apresenta resultados de uma pesquisa feita com algumas Organizações Não Governamentais-ONGs brasileiras, sobre as contribuições do MSL para a adesão, implementação e migração dos softwares livres por estas ONGs. (shrink)

Van Inwagen's General Composition Question (GCQ) asks what conditions on an object and its constituents make the object a whole that these constituents compose, as opposed to an object linked to the constituents by a relation other than composition. The answer is traditionally expected to cite no mereological terms, to hold of metaphysical necessity and to be such that no defeating scenarios can be conceived (e.g., a scenario in which the conditions are met but the constituents fail to genuinely compose (...) the object). While not all writers agree on setting these high expectations on the principles that constitute answers to the GCQ (Hawley 2006), there is a yet unsettled issue concerning the principles’ naturalistic accreditation: Could putative principles be constrained and informed by advanced physical knowledge? Arguing positively, we outline two styles of principles worthy of naturalistic authority. In an explorative spirit, we notice that each style incurs certain costs. First, the principle in question may fail some of the above expectations set in an aprioristic context. Second, it may require a specific meta-theoretic understanding of what it takes to achieve naturalistic accreditation. Finally, it may address the GCQ “piecemeal” and fail to generalize to objects of all physical sorts.1. (shrink)

ABSTRACT The article deals with the early career of the literary critic Alberto Asor Rosa, one of the founders of the operaismo movement, a Marxist tendency advocating the management of factories by workers through bottom-up councils. It outlines the role he assigned to literature and culture, investigating his criticism first against the non-revolutionary cultural politics of the Italian Communist Party, notoriously through his book Scrittori e popolo and his writings for the periodical classe operaia, then identifying a transition from a (...) destructive approach against any culture based on values to the use of cultural disciplines purely as techniques. The article posits that this instrumental understanding of culture depended on Asor Rosa’s political choice to take the perspective of the working class, in order to use culture itself for social analysis. In the second half of the decade, contributing to the periodicals Angelus novus and Contropiano, he still considered culture ineffective as a way towards revolution, but he began to value the great works of ʻbourgeois’ literature for their ability to penetrate the middle-class spirit and undermine capitalist society. The article concludes that, despite his changing idea of culture, Asor Rosa’s opinions on the intellectual’s task fit the traditional concept of it. (shrink)

In this paper I focus on the question of whether nanotechnology is giving rise to new ethical problems rather than merely to new instances of old ethical problems. Firstly, I demonstrate how important it is to make a general distinction between new ethical problems and new instances of old problems. Secondly, I propose one possible way of interpreting the distinction and offer a definition of a “new ethical problem”. Thirdly, I examine whether there is good reason to claim that nanotechnology (...) is giving or will give rise to new ethical problems. My conclusion is that there are no new ethical problems in nanotechnology but merely new occurrences of certain well-known types of ethical problems. Fourthly, I consider three arguments by van de Poel (NanoEthics 2:25–28, 2008) which contradict my conclusion. I argue that my negative conclusion is consistent with the claim that certain ethical issues arising in nanotechnology may require new normative standards or new analytical tools. I conclude that it is likely that a number of ethical issues arising in nanotechnology will have a considerable impact on our ethical theories and values – and that ethical reflection on nanotechnology will be one of the mother lodes of future ethical research – in spite of the fact that no ethical problem in nanoethics will actually be “new”. (shrink)

Plutarch’s account of Lucullus unsuccessfully begging his soldiers to follow him further, shortly before being forced to leave his command, is commonly read as the apex of his failure as a military leader. A close reading, however, reveals two hitherto overlooked aspects. Firstly, the story offers valuable information on late Republican military history, regarding the duration of military service before Augustus’ reform and the existence of clearly defined subgroups within the army. Secondly, the conflict between Lucullus and his soldiers allows (...) us to get a glimpse of the political debate of the time, characterised by the competing claims to Sulla’s heritage, the shift of military loyalty towards specific individuals, and above all the question of who really represented the interests of the res publica. (shrink)

This anthology contains selected papers from the 'Science as Culture' conference held at Lake Como, and Pavia University Italy, 15-19 September 1999. The conference, attended by about 220 individuals from thirty countries, was a joint venture of the International History, Philosophy and Science Teaching Group (its fifth conference) and the History of Physics and Physics Teaching Division of the European Physical Society (its eighth conference). The magnificient Villa Olmo, on the lakeshore, provided a memorable location for the presentors of the (...) 160 papers and the audience that discussed them. The conference was part of local celebrations of the bicentenary of Alessandro Volta's creation of the battery in 1799. Volta was born in Como in 1745, and for forty years from 1778 he was professor of experimental physics at Pavia University. The conference was fortunate to have had the generous financial support of the Italian government's Volta Bicentenary Fund, Lombardy region, Pavia University, Italian Research Council, and Kluwer Academic Publishers. The papers included here, have or will be, published in the journal Science & Education, the inaugural volume (1992) of which was a landmark in the history of science education publication, because it was the first journal in the field devoted to contributions from historical, philosophical and sociological scholarship. Clearly these 'foundational' disciplines inform numerous theoretical, curricular and pedagogical debates in science education. Contemporary Concerns The reseach promoted by the International and European Groups, and by the journal, is central to science education programmes in most areas of the world. (shrink)

ABSTRACT Quaderni piacentini, set up in 1962 by Piergiorgio Bellocchio and Grazia Cherchi, was probably the most iconic leftist periodical in Italy before 1968. Its criticism against both the Italian Communist Party for its non-revolutionary policy and the reformist centre-left coalition, its uncompromising ethics, and its exploring into non-orthodox Marxist approaches made it representative of the intellectual New Left in Italy, against the background of advanced industrialization. This article explores the changing perception of the role of intellectuals in society from (...) classic forms of an elitist political involvement to the desired identification with the masses. It argues that between the two different ways to approach culture that intersected in Quaderni piacentini and characterized the debate around 1968, namely the one expressed by Franco Fortini – advocate of the function of intellectuals and of the use of literature for political purposes – and the one supported by Alberto Asor Rosa – convinced of the need for a self-destruction of traditional ʻbourgeois' disciplines – the periodical tended to side with the former, in order to keep culture a credible and legitimate tool for militancy. (shrink)

Book 1 of Euclid's Elements opens with a set of unproved assumptions: definitions, postulates, and ‘common notions’. The common notions are general rules validating deductions that involve the relations of equality and congruence. The attested postulates are five in number, even if a part of the manuscript tradition adds a sixth, almost surely spurious, that in some manuscripts features as the ninth, and last, common notion. The postulates are called αἰτήματα both in the manuscripts of the Elements and in the (...) ancient exegetic tradition. It is not said, however, that this denomination is original, as it coincides with the nomen rei actae associated with the verbal form introducing the postulates themselves. Since antiquity it has been recognized that the postulates naturally split into two groups of quite different character: the first three are rules licensing basic constructions, the fourth and the fifth are assertions stating properties of particular geometric objects. I transcribe postulates 1–3 in the text established by Heiberg : ᾐτήσθω ἀπὸ παντὸς σημείου ἐπὶ πᾶν σημεῖον εὐθεῖαν γραμμὴν ἀγαγεῖνκαὶ πεπερασμένην εὐθεῖαν κατὰ τὸ συνεχὲς ἐπ᾽ εὐθείας ἐκβαλεῖνκαὶ παντὶ κέντρῳ καὶ διαστήματι κύκλον γράϕεσθαι. (shrink)

The aim of the study was to evaluate the effectiveness of a media literacy intervention targeting, for the first time, the specific topic of Performance and Appearance Enhancing Substances use in high-school students. Overall, 389 students aged between 13 and 19 years participated to a media literacy intervention while 103 students aged between 14 and 19 year were considered as the control group. In two separate occasions over the course of six consecutive months, students in both groups filled out a (...) set of questionnaires which included measures of social-cognitive beliefs and a self-reported measure of retrospective use of doping and supplements. Compared to students in the control group = 1.96; SD= 0.85; and Mean= 2.09; SD= 0.94), intervention students on average expressed relatively stronger attitudes against doping use over time = 2.2; SD= 0.85; and Mean= 2.05; SD= 0.82). Students in the latter group also showed a statistically significant decrease in self-reported supplement use = 6.7%; Use= 3.8%;p= 0.05, McNemar Test). Interestingly, albeit marginally significant, students in the control group showed a relative increment in the self-reported use of supplements over time = 4.9%; Use= 8.7%;p= 0.22, McNemar Test). Overall, the media literacy intervention investigated in the present study was effective in decreasing adolescent student’s positive attitudes toward doping use and in reducing the use of legal PAES. These findings supported the generalizability and the usefulness of a media literacy approach in the specific field of PAES. (shrink)

Solidarity can be conceived in multiple ways. This article probes possible underlying ontological and normative assumptions of solidarity. In order to conceptually clarify the notion of solidarity, we distinguish between five types of solidarity. We suggest that solidarity is either grounded in the Enlightenment ideas of liberty, or a category of loyalty and allegiance. If the former is the case, solidarity can be justified on rational grounds. If the latter is the case, it is contingent on narratives of historical continuity (...) and a non-rational sense of belonging. Moreover, we show that different types of solidarity can be derived from Anglo-Saxon and continental thought, which hints at different conceptions of community. (shrink)

Several theists, including Linda Zagzebski, have claimed that theism is somehow committed to nonvacuism about counterpossibles. Even though Zagzebski herself has rejected vacuism, she has offered an argument in favour of it, which Edward Wierenga has defended as providing strong support for vacuism that is independent of the orthodox semantics for counterfactuals, mainly developed by David Lewis and Robert Stalnaker. In this paper I show that argument to be sound only relative to the orthodox semantics, which entails vacuism, and give (...) an example of a semantics for counterfactuals countenancing impossible worlds for which it fails. (shrink)

The idea that an adequate semantics of ordinary language calls for some theory of events has sparked considerable debate among linguists and philosophers. On the one hand, so many linguistic phenomena appear to be explained if (and, according to some authors, only if) we make room for logical forms in which reference to or quantification over events is explicitly featured. Examples include nominalization, adverbial modification, tense and aspect, plurals, and singular causal statements. On the other hand, a number of deep (...) philosophical questions arise as soon as we take events into consideration. Are events entities of a kind? What are their identity and individuation criteria? How does semantic theorizing depend on such metaphysical issues? The aim of this book is to address such issues in some depth, with emphasis precisely on the interplay between linguistic applications and philosophical implications. Contributors: N. Asher, P. M. Bertinetto, J. Brandl, D. Delfitto, R. Eckardt, J. Higginbotham, A. Lenci, T. Parsons, A. ter Meulen, H. Verkuyl. A comprehensive introductory essay (pp. 3-47) is included. (shrink)

This paper discusses some societal implications of the most recent and publicly discussed application of advanced machine learning techniques: generative AI models, such as ChatGPT (text generation) and DALL-E (text-to-image generation). The aim is to shift attention away from conceptual disputes, e.g. regarding their level of intelligence and similarities/differences with human performance, to focus instead on practical problems, pertaining the impact that these technologies might have (and already have) on human societies. After a preliminary clarification of how generative AI works (...) (Sect. 1), the paper discusses what kind of transparency ought to be required for such technologies and for the business model behind their commercial exploitation (Sect. 2), what is the role of user-generated data in determining their performance and how it should inform the redistribution of the resulting benefits (Sect. 3), the best way of integrating generative AI systems in the creative job market and how to properly negotiate their role in it (Sect. 4), and what kind of “cognitive extension” offered by these technologies we ought to embrace, and what type we should instead resist and monitor (Sect. 5). The last part of the paper summarizes the main conclusions of this analysis, also marking its distance from other, more apocalyptic approaches to the dangers of AI for human society. (shrink)

The aim of this article is to present and discuss the language of the «givens», a typical stylistic resource of Greek mathematics and one of the major features of the proof format of analysis and synthesis. I shall analyze its expressive function and its peculiarities, as well as its general role as a deductive tool, explaining at the same time its particular applications in subgenres of a geometrical proposition like the locus theorems and the so-called «porisms». The main interpretative theses (...) of this study are the following: the language of the «givens» (1) is the standard idiom in which “existence and uniqueness” of a mathematical object was proved, (2) was conceived as an unified framework reducing to a strictly deductive format disparate argumentative steps such as deductions, constructions, and calculations. (shrink)

In this paper we present tableau methods for two-dimensional modal logics. Although models for such logics are well known, proof systems remain rather unexplored as most of their developments have been purely axiomatic. The logics herein considered contain first-order quantifiers with identity, and all the formulas in the language are doubly-indexed in the proof systems, with the upper indices intuitively representing the actual or reference worlds, and the lower indices representing worlds of evaluation—first and second dimensions, respectively. The tableaux modulate (...) over different notions of validity such as local, general, and diagonal, besides being general enough for several two-dimensional logics proposed in the literature. We also motivate the introduction of a new operator into two-dimensional languages and explore some of the philosophical questions raised by it concerning the relations there are between actuality, necessity, and the a priori, that seem to undermine traditional intuitive interpretations of two-dimensional operators. (shrink)

Elefanti nani, inesistenti regni medievali, parodie politiche scambiate per vere, panzane virali e dibattiti privi di senso sui social media. Le bufale un tempo erano oggetto di curiosità, bizzarri orpelli della credulità umana di cui discutere fra il serio e il faceto. Oggi causano allarme sociale, come ci dimostra la cronaca recente: la baraonda digitale prodotta dal diffondersi di un'epidemia può minare alla radice i tentativi di combatterla, o al contrario facilitare una risposta collettiva sensata ed efficace. Perché la disinformazione (...) online è soprattutto il sintomo di cambiamenti radicali nelle nuove tecnologie di comunicazione. Convivere felicemente con tutto questo è possibile, e persino necessario. Per farlo, bisogna considerare le bufale non spazzatura di cui sbarazzarsi, ma piuttosto fantastici laboratori su cui affinare le nostre competenze. Una proposta originale per orientarsi meglio nella nuova ecologia dell'informazione--Page 2 of cover. (shrink)