In this paper the analysis of the classical dynamics of a charged particle is carried out without considering that the electromagnetic field necessarily goes to zero at infinity. A quite general non-linear equation of motion is obtained for an extended charged particle valid for any distribution of charge in the particle and for an electromagnetic field satisfying any boundary conditions. Some common approximations are analyzed with detail to determine how the usual difficulties arise.

An alternative approach to analyze the nonrelativistic quantum dynamics of a rigid and extended charged particle taking into account the radiation reaction is discussed with detail. Interpretation of the field operators as annihilation and creation ones, theory of perturbations and renormalization are not used. The analysis is carried out in the Heisenberg picture with the electromagnetic field expanded in a complete orthogonal basis set of functions which allows the electromagnetic field to satisfy arbitrary boundary conditions. The corresponding coefficients are the (...) field operators which satisfy the usual commutation relations. A nonlinear equation of motion for the charged particle is obtained. A careful consideration of the quantum effects allows the derivation of a linear equation of motion which is free of both runaway solutions and preacceleration, even for a point charge. Also, the electromagnetic mass, which is defined as the coefficient of the acceleration operator, vanishes for a point particle. However, this does not mean that the results are free of ambiguities which are exhibited and discussed. (shrink)

In order to understand the rise of runaway solutions in the radiation reaction problem a mechanical model is used. An alternative demonstration of Daboul’s theorem, through Hurwitz’s criterion, is given. The origin of runaway solutions in electrodynamics is discussed. They arise when the particle has a negative mechanical mass or when approximations are used in the equation of motion. In the 1-dimensional mechanical model an exact and linear equation of motion for the particle is obtained, the corresponding exact solution is (...) again runaway when the mechanical mass is negative. The exact solution is not runaway when the mechanical mass is positive. However, the use of approximations leads to an equation of motion which has runaway solutions. It is exhibited that the use of approximations in the 3-dimensional mechanical model is completely necessary because the general equation of motion for the particle is non-linear. The analysis of this case proceeds in a very similar way to the one carried out in electrodynamics. This means that the number of dimensions also plays an important role in the analysis. (shrink)

Le domande sulla natura, le fonti e la possibilità della conoscenza sono da sempre al centro della riflessione filosofica, ma negli ultimi decenni sono state affrontate da nuovi punti di vista e con metodologie inedite, ricevendo risposte talora sorprendenti. Questo volume presenta un campione della ricerca epistemologica più recente, rendendo accessibili al pubblico italiano i contributi di alcuni dei maggiori studiosi contemporanei della disciplina. L'opera è suddivisa in quattro parti, dedicate rispettivamente alla dipendenza del sapere da fattori contestuali e pragmatici, (...) alle alternative funzionaliste e sperimentali alla tradizionale analisi filosofica della conoscenza, alla distinzione fra conoscenza a priori e a posteriori e alla dimensione sociale della conoscenza. Ciascuna sezione è corredata da un saggio introduttivo che offre gli elementi necessari per comprendere i testi presentati e da una bibliografia ragionata che fornisce indicazioni per approfondire gli argomenti trattati. (shrink)

Secondo la definizione “standard”, la menzogna è definita da quattro condizioni necessarie, congiuntamente sufficienti. La prima (condizione dell’asserto) richiede che il parlante proferisca un asserto in una frase dichiarativa dotata di senso compiuto. La seconda (condizione dell’insincerità), stabilisce che il parlante debba credere falso il contenuto proposizionale (p) del suo asserto, e la terza (condizione dell’interlocutore) richiede che l’asserto sia rivolto a un interlocutore. Secondo l’ultima condizione (condizione dell’intenzione di ingannare), il parlante deve avere l’intenzione di far credere all’interlocutore che (...) p è vero. Nei primi 5 capitoli di questa tesi discuto pregi e difetti di ognuna di queste condizioni. Nell’ultimo capitolo propongo una lettura pragmatica della menzogna, intesa come asserzione insincera, toccando questioni legate alla teoria degli atti linguistici e delle implicature conversazionali. (shrink)

All’interno del dibattito sulla definizione filosofica della menzogna, alcuni autori hanno sostenuto che mentire è sempre sbagliato. Margolis, in particolare, ha espresso la tesi radicale secondo cui “mentire è moralmente sbagliato” è una tautologia. Nella prima parte dell’articolo introduco la tesi di Margolis, e ne difendo la plausibilità contro le semplificazioni che ha subito all’interno del dibattito filosofico, mostrando che l’applicazione condizionale del predicato “sbagliato” consente di trattare in modo adeguato alcune menzogne intuitivamente giustificabili. Nella seconda parte argomento che, nonostante (...) questo stratagemma, non è possibile difendere la tesi che “mentire è moralmente sbagliato” sia una tautologia, perché bisognerebbe assumere che “mentire è moralmente sbagliato” sia una condizione necessaria fra quelle che definiscono il concetto stesso di menzogna. Questo non è desiderabile perché, come dimostro nella parte finale del mio articolo, ogni definizione di menzogna che incorpori requisiti morali nelle sue condizioni necessarie é destinata a contraddire le intuizioni del senso comune su che cos’é una menzogna. La conclusione è che la tesi che “mentire è moralmente è sbagliato” è una tautologia non può essere difesa, se non al prezzo, troppo alto, di ridefinire in modo controintuitivo il significato del termine “menzogna”. (shrink)

Le rejet de End of Track de Mou Tunfei (fin années 60), film “invisible”, jamais distribué, prouve à quel point les thématiques abordées (homosexualité, différence de classes, nihilisme) étaient taboues pour toute une génération. Banana Paradise (années 80) évoque la façon dont deux frères d’armes survivent en usurpant l’identité de camarades décédés, et finissent par s’épanouir dans une société en exil taraudée par la mémoire du continent. Enfin, Gf/Bf (années 2000) développe des thématiques jadis censurées (homosexualité, démocratisation) et qui refont (...) surface via le prisme du triangle amoureux. Malgré leur hétérogénéité, ces films permettent de constituer une histoire de ce rapport fraternel dans des contextes ambigus et dissonants ; à travers trois films d’époques différentes, je retrace l’évolution dans le temps de la représentation de l’amitié entre hommes, une évolution qui révèle un « changement de paradigme » au sein même de la société taiwanaise. (shrink)

Le rejet de End of Track de Mou Tunfei (fin années 60), film “invisible”, jamais distribué, prouve à quel point les thématiques abordées (homosexualité, différence de classes, nihilisme) étaient taboues pour toute une génération. Banana Paradise (années 80) évoque la façon dont deux frères d’armes survivent en usurpant l’identité de camarades décédés, et finissent par s’épanouir dans une société en exil taraudée par la mémoire du continent. Enfin, Gf/Bf (années 2000) développe des thématiques jadis censurées (homosexualité, démocratisation) et qui refont (...) surface via le prisme du triangle amoureux. Malgré leur hétérogénéité, ces films permettent de constituer une histoire de ce rapport fraternel dans des contextes ambigus et dissonants ; à travers trois films d’époques différentes, je retrace l’évolution dans le temps de la représentation de l’amitié entre hommes, une évolution qui révèle un « changement de paradigme » au sein même de la société taiwanaise. (shrink)

Bundle theory takes objects to be bundles of properties. Some bundle theorists take objects to be bundles of instantiated universals, and some take objects to be bundles of tropes. Tropes are instances of properties: some take instantiated universals to be tropes, while others deny the existence of universals and take tropes to be ontologically fundamental. Historically, the bundling relation has been taken to be a primitive relation, not analyzable in terms of or ontologically reducible to some other relation, and has (...) been variously characterized as, e.g., “compresence,” “concurrence,” or “consubstantiation.” Bertrand Russell (1940) defends compresence of universals, and Hector-Neri Castañeda (1974) defends consubstantiation of universals. John Bacon (1995) defends concurrent tropes and Keith Campbell (1990) defends compresent tropes. Jonathan Schaffer (2001) bucks this trend, endorsing compresence understood as co-location in spacetime, but this brings with it undesireable consequences such as the impossibility of distinguishing between objects (such as electrons or other microentities) with the same location. Mereological bundle theory improves upon traditional bundle theory by taking the primitive relation of bundling to be the more familiar relation of fusing or composing, such that objects are fusions of properties or fusions of property instances. Hence, mereological bundle theorists endorse a property mereology: a mereology where properties or property instances can be parts of objects. An advantage of the approach derives from the fact that standard mereologies take composition to be primitive or define it using a different primitive mereological notion (such as primitive parthood). Thus, taking the basic primitive of bundle theory to be composition can reduce the need for.. (shrink)

La flânerie offre un pont qui relie les rives de la gestion et de la philosophie. Cet article clarifie d’abord le sens de la flânerie chez Taylor, sa distinction entre flâneries naturelle et systématique, et l’attention spécifique porté par Taylor à cette dernière, collective, organisée et sournoise, donc plus difficilement rationalisable. Il confronte ensuite Taylor aux réflexions de Benjamin s’attachant aux métamorphoses du flâneur dans le Paris du xix e siècle, pour interroger enfin l’ambiguïté de la flânerie et son potentiel (...) révolutionnaire : pour Taylor, la maîtrise du désir devient l’objet même du management ; pour Benjamin, la flânerie apparaît comme l’une des dernières possibilités de voir éclater l’espace-temps homogène de la Fin de l’Histoire. Le management contemporain clôt cette tension en intégrant les actions et les pensées des travailleurs dans de multiples boucles de rétroaction. (shrink)

According to an influential view, asserting a proposition involves undertaking some “commitment” to the truth of that proposition. But accounts of what it is for someone to be committed to the truth of a proposition are often vague or imprecise, and are rarely put to work to define assertion. This paper aims to fill this gap. It offers a precise characterisation of assertoric commitment, and shows how it can be applied to define assertion. On the proposed view, acquiring commitment is (...) not sufficient for asserting. To assert, commitment must be acquired by explicitly presenting a proposition as true. (shrink)

Speech acts are governed by a variety of illocutionary norms. Building on Sbisà’s (2019) work, this chapter attempts to develop a common framework to study them. Four families of illocutionary rules are identified: (i) Validity rules set conditions for (actual) performance; (ii) Cooperative rules set conditions for cooperative performance; (iii) Illocutionary goals set conditions for successful performance; (iv) Illocutionary obligations set conditions for compliance. Illocutionary rules are often taken to play a constitutive role: speech acts are said to be constituted (...) by the unique set of rules that regulates them. Against this view, it is argued that many illocutionary rules are instead best construed as rationally derivable expectations of cooperation. This alternative paradigm provides fertile ground to reconcile scholarly disagreement between speech act theorists, and yields a promising explanation of how illocutionary norms are learned and evolve through time. (shrink)

How can we capture the intuitive distinction between lying and misleading? According to a traditional view, the difference boils down to whether the speaker is saying (as opposed to implying) something that they believe to be false. This view is subject to known objections; to overcome them, an alternative view has emerged. For the alternative view, what matters is whether the speaker can consistently deny that they are committed to knowing the relevant proposition. We point out serious flaws for this (...) alternative view, and sketch a simpler alternative that incorporates key insights of the traditional view. (shrink)

A new definition of lying is gaining traction, according to which you lie only if you say what you know to be false. Drawing inspiration from “New Evil Demon” scenarios, I present a battery of counterexamples against this “Knowledge Account” of lying. Along the way, I comment upon the methodology of conceptual analysis, the moral implications of the Knowledge Account, and its ties with knowledge-first epistemology.

This paper is divided into two parts. In the first part, I extend the traditional definition of lying to illocutionary acts executed by means of explicit performatives, focusing on promising. This is achieved in two steps. First, I discuss how the utterance of a sentence containing an explicit performative such as “I promise that Φ ” can count as an assertion of its content Φ . Second, I develop a general account of insincerity meant to explain under which conditions a (...) given illocutionary act can be insincere, and show how this applies to promises. I conclude that a promise to Φ is insincere (and consequently a lie) only if the speaker intends not to Φ , or believes that he will not Φ , or both. In the second part, I test the proposed definition of lying by promising against the intuitions of ordinary language speakers. The results show that, unlike alternative accounts, the proposed definition makes the correct predictions in the cases tested. Furthermore, these results challenge the following necessary conditions for telling a lie with content p: that you have to assert p directly; that you have to believe that p be false; that p must be false; that you must aim to deceive the addressee into believing that p. (shrink)

Is truth the rule or the aim of assertion? Philosophers disagree. After reviewing the available evidence, the hypothesis that truth is the aim of assertion is defended against recent attempts to prove that truth is rather a rule of assertion.

Assertions are our standard communicative tool for sharing and acquiring information. Recent empirical studies seemingly provide converging evidence that assertions are subject to a factive norm: you are entitled to assert a proposition p only if p is true. All these studies, however, assume that we can treat participants' judgments about what an agent 'should say' as evidence of their intuitions about assertability. This paper argues that this assumption is incorrect, so that the conclusions drawn in these studies are unwarranted. (...) It shows that most people do not interpret statements about what an agent 'should say' as statements about assertability, but rather as statements about what is in the agent's interest to do. It identifies some effective measures to force the intended reading of statements about what an agent 'should say', and shows that when these measures are implemented, people's judgments consistently and overwhelmingly align with non-factive accounts of assertion. (shrink)

In a recent book (_Lying and insincerity_, Oxford University Press, 2018), Andreas Stokke argues that one lies iff one says something one believes to be false, thereby proposing that it becomes common ground. This paper shows that Stokke’s proposal is unable to draw the right distinctions about insincere performative utterances. The objection also has repercussions on theories of assertion, because it poses a novel challenge to any attempt to define assertion as a proposal to update the common ground.

The concept of a communal type of privacy shared by interconnected social groups has wide applications in the healthcare field, specifically in genetic testing and genetic data privacy (Pyrrho, Cam...

This paper analyses the communicative and epistemic value of retweeting (and more generally of reposting content on social media). Against a naïve view, it argues that retweets are not acts of endorsement, motivating this diagnosis with linguistic data. Retweeting is instead modelled as a peculiar form of quotation, in which the reported content is indicated rather than reproduced. A relevance-theoretic account of the communicative import of retweeting is then developed, to spell out the complex mechanisms by which retweets achieve their (...) communicative goals. The last section outlines the epistemic threats posed by the increasing prevalence of retweeting on social media, linking them to the low reputational, cognitive and practical costs linked to this emerging form of communication. (shrink)

There is a fundamental disagreement about which norm regulates assertion. Proponents of factive accounts argue that only true propositions are assertable, whereas proponents of non-factive accounts insist that at least some false propositions are. Puzzlingly, both views are supported by equally plausible (but apparently incompatible) linguistic data. This paper delineates an alternative solution: to understand truth as the aim of assertion, and pair this view with a non-factive rule. The resulting account is able to explain all the relevant linguistic data, (...) and finds independent support from general considerations about the differences between rules and aims. (shrink)

Not every speech act can be a lie. A good definition of lying should be able to draw the right distinctions between speech acts that can be lies and speech acts that under no circumstances are lies. This paper shows that no extant account of lying is able to draw the required distinctions. It argues that a definition of lying based on the notion of ‘assertoric commitment’ can succeed where other accounts have failed. Assertoric commitment is analysed in terms of (...) two normative components: ‘accountability’ and ‘discursive responsibility’. The resulting definition of lying draws all the desired distinctions, providing an intensionally adequate analysis of the concept of lying. (shrink)

In a recent article, Krauss (2017) raises some fundamental questions concerning (i) what the desiderata of a definition of lying are, and (ii) how definitions of lying can account for partial beliefs. This paper aims to provide an adequate answer to both questions. Regarding (i), it shows that there can be a tension between two desiderata for a definition of lying: 'descriptive accuracy' (meeting intuitions about our ordinary concept of lying), and 'moral import' (meeting intuitions about what is wrong with (...) lying), vindicating the primacy of the former desideratum. Regarding (ii), it shows that Krauss' proposed 'worse-off requirement' meets neither of these desiderata, whereas the 'comparative insincerity condition' (Marsili 2014) can meet both. The conclusion is that lies are assertions that the speaker takes to be more likely to be false than true, and their distinctive blameworthiness is a function of the extent to which they violate a sincerity norm. (shrink)

Arguably, a theory of assertion should be able to provide (i) a definition of assertion, and (ii) a set of conditions for an assertion to be appropriate. This paper reviews two strands of theories that have attempted to meet this challenge. Commitment-based accounts à la Peirce define assertion in terms of commitment to the truth of the proposition. Restriction-based accounts à la Williamson define assertion in terms of the conditions for its appropriate performance. After assessing the suitability of these projects (...) to meet the desiderata of a theory of assertion, I argue that a speech act theoretic account à la Searle is more suitable for this purpose: it integrates the core intuitions of both restriction-based and commitment-based accounts while avoiding their respective problems, and has the further advantage of determining how assertion fits into a more general theory of illocutionary acts. (shrink)

According to an influential hypothesis, the speech act of assertion is subject to a single 'constitutive' rule, that takes the form: "One must: assert that p only if p has C". Scholars working on assertion interpret the assumption that this rule is 'constitutive' in different ways. This disagreement, often unacknowledged, threatens the foundations of the philosophical debate on assertion. This paper reviews different interpretations of the claim that assertion is governed by a constitutive rule. It argues that once we understand (...) the full import of assuming that assertion is governed by a constitutive rule, it becomes clear that some fundamental assumptions of the current debate are mistaken, and others unwarranted. (shrink)

In a series of articles (Pagin, 2004, 2009), Peter Pagin has argued that assertion is not a social speech act, introducing a method (which we baptize ‘the P-test’) designed to refute any account that defines assertion in terms of its social effects. This paper contends that Pagin's method fails to rebut the thesis that assertion is social. We show that the P-test is both unreliable (because it overgenerates counterexamples) and counterproductive (because it ultimately provides evidence in favor of some social (...) accounts). Nonetheless, we contend that assertion is not fully social. We defend an intermediate view according to which assertion is only a partly social speech act: assertions both commit the speaker to a proposition (a social component) and present their propositional content as true (a non-social component). The upshot is that assertion is in some important respect social, although it cannot be defined solely in terms of its social effects. (shrink)

Heinz Kurz is recognised internationally as a leading economic theorist and a foremost historian of economic thought. This book pays tribute to his outstanding contributions on the occasion of his 65 th birthday by bringing together a unique collection of new essays by distinguished economists from around the world. Keynes, Sraffa, and the Criticism of Neoclassical Theory comprises twenty-three essays, covering themes in Keynesian economic theory, in the development of the modern classical approach to economic theory, linear production models, and (...) the critique of neoclassical theory. The essays in this book will be an invaluable source of inspiration for economists interested in economic theory and in the evolution of economic thought. They will also be of interest to postgraduate and research students specialising in economic theory and in the history of economic thought. (shrink)

In the philosophical debate on lying, there has generally been agreement that either the speaker believes that his statement is false, or he believes that his statement is true. This article challenges this assumption, and argues that lying is a scalar phenomenon that allows for a number of intermediate cases – the most obvious being cases of uncertainty. The first section shows that lying can involve beliefs about graded truth values (fuzzy lies) and graded beliefs (graded-belief lies). It puts forward (...) a new definition to deal with these scalar parameters, that requires that the speaker asserts what he believes more likely to be false than true. The second section shows that statements are scalar in the same way beliefs are, and accounts for a further element of scalarity, illocutionary force. (shrink)

In the philosophical literature on the definition of lying, the analysis is generally restricted to cases of flat-out belief. This chapter considers the complex phenomenon of lies involving partial beliefs – beliefs ranging from mere uncertainty to absolute certainty. The first section analyses lies uttered while holding a graded belief in the falsity of the assertion, and presents a revised insincerity condition, requiring that the liar believes the assertion to be more likely to be false than true. The second section (...) analyses assertions that express graded beliefs, exploring how mitigation and reinforcement can alter the insincerity conditions for lying. The last section considers the case of lies that attack certainty (knowledge-lies), understood as attempt to alter the hearer's graded beliefs. (shrink)

This thesis addresses philosophical problems concerning improper assertions. The first part considers the issue of defining lying: here, against a standard view, I argue that a lie need not intend to deceive the hearer. I define lying as an insincere assertion, and then resort to speech act theory to develop a detailed account of what an assertion is, and what can make it insincere. Even a sincere assertion, however, can be improper (e.g., it can be false, or unwarranted): in the (...) second part of the thesis, I consider these kinds of impropriety. An influential hypothesis maintains that proper assertions must meet a precise epistemic standard, and several philosophers have tried to identify this standard. After reviewing some difficulties for this approach, I provide an innovative solution to some known puzzles concerning the permissibility of false assertions. In my view, assertions purport to aim at truth, but they are not subject to a norm that requires speakers to assert a proposition only if it is true. (shrink)