Cumulative Prospect Theory is the modern version of Prospect Theory and it is nowadays considered a valid alternative to the classical Expected Utility Theory. Cumulative Prospect theory implies Gain-Loss Separability, i.e., the separate evaluation of losses and gains within a mixed gamble. Recently, some authors have questioned this assumption of the theory, proposing new paradoxes where the Gain-Loss Separability is violated. We present a generalization of Cumulative Prospect Theory which does not imply Gain-Loss Separability and is able to explain the (...) cited paradoxes. On the other hand, the new model, which we call the bipolar Cumulative Prospect Theory, genuinely generalizes the original Prospect Theory of Kahneman and Tversky, preserving the main features of the theory. We present also a characterization of the bipolar Choquet Integral with respect to a bi-capacity in a discrete setting. (shrink)

In this paper I will present a puzzle about epistemic akrasia, and I will use that puzzle to motivate accepting some non-standard views about the nature of epistemological judgment. The puzzle is that while it seems obvious that epistemic akrasia must be irrational, the claim that epistemic akrasia is always irrational amounts to the claim that a certain sort of justified false belief—a justified false belief about what one ought to believe—is impossible. But justified false beliefs seem to be possible (...) in any domain, and it’s hard to see why beliefs about what one ought to believe should be an exception. I will argue that when we get clearer about what sort of psychological state epistemic akrasia is, we can resolve the puzzle in favor of the intuitive view that epistemic akrasia is always irrational. (shrink)

How do we transmit or distribute knowledge, as distinct from generating or producing it? In this book John Greco examines the interpersonal relations and social structures which enable and inhibit the sharing of knowledge within and across epistemic communities. Drawing on resources from moral theory, the philosophy of language, action theory and the cognitive sciences, he considers the role of interpersonal trust in transmitting knowledge, and argues that sharing knowledge involves a kind of shared agency similar to giving a (...) gift or passing a ball. He also explains why transmitting knowledge is easy in some social contexts, such as those involving friendship or caregiving, but impossible in contexts characterized by suspicion and competition rather than by trust and cooperation. His book explores phenomena that have been undertheorized by traditional epistemology, and throws new light on existing problems in social epistemology and the epistemology of testimony. (shrink)

Semantic theories based on a hierarchy of types have prominently been used to defend the possibility of unrestricted quantification. However, they also pose a prima facie problem for it: each quantifier ranges over at most one level of the hierarchy and is therefore not unrestricted. It is difficult to evaluate this problem without a principled account of what it is for a quantifier to be unrestricted. Drawing on an insight of Russell’s about the relationship between quantification and the structure of (...) predication, we offer such an account. We use this account to examine the problem in three different type-theoretic settings, which are increasingly permissive with respect to predication. We conclude that unrestricted quantification is available in all but the most permissive kind of type theory. (shrink)

The first handbook on the topic of religious epistemology introduces and discusses topics fundamental to the epistemology of religious belief.

This chapter reviews a number of related problems in the epistemology of testimony, and suggests some dilemmas for any theory of knowledge that tries to solve them. Here a common theme emerges: It can seem that any theory must make testimonial knowledge either too hard or too easy, and that therefore no adequate account of testimonial knowledge is possible. The chapter then puts forward a proposal for making progress. Specifically, an important function of the concept of knowledge is to govern (...) the acquisition and distribution of quality information within an epistemic community. Testimonial exchanges paradigmatically serve in the distribution role, but sometimes serve in the acquisition role. The resulting position, it is argued, explains why testimonial knowledge is sometimes easy to get, and sometimes much harder. (shrink)

This book investigates the role of inference in argumentation, considering how arguments support standpoints on the basis of different loci. The authors propose and illustrate a model for the analysis of the standpoint-argument connection, called Argumentum Model of Topics. A prominent feature of the AMT is that it distinguishes, within each and every single argumentation, between an inferential-procedural component, on which the reasoning process is based; and a material-contextual component, which anchors the argument in the interlocutors’ cultural and factual common (...) ground. The AMT explains how these components differ and how they are intertwined within each single argument. This model is introduced in Part II of the book, following a careful reconstruction of the enormously rich tradition of studies on inference in argumentation, from the antiquity to contemporary authors, without neglecting medieval and post-medieval contributions. The AMT is a contemporary model grounded in a dialogue with such tradition, whose crucial aspects are illuminated in this book. (shrink)

When we say that someone knows something we are making a value judgment—we are saying that there is something intellectually good or right about the person’s belief, or about the way she believes it, or perhaps about her. We are saying, for example, that her belief is intellectually better than someone else’s mere opinion. Notice that we might make this sort of value judgment even if the two persons agree. Suppose that two people agree that the earth is the third (...) planet from the sun. Nevertheless, we might think that one person knows this while the other person merely believes it. If so, we are making a value judgment—we are saying that there is something intellectually better going on in the case of knowledge. Another way to put the point is to say that knowledge is a normative notion. There is something normatively better about the case of knowledge, as opposed to the case of mere opinion, or even the case of true opinion. Finally, saying that someone knows something is not the only sort of value judgment we can make about her belief. Even if we agree that some belief falls short of knowledge, we might nevertheless judge that it is justified, or rational, or reasonable, or responsible. In each such case, we are saying that there is something normatively better about the case in question, as opposed to the case of mere opinion, or even the case of true opinion. (shrink)

Recent interest in the epistemology of testimony can be traced to C. A. J. Coady's Testimony: A Philosophical Study (1992) and then a collection of papers edited by Bimal Krishna Matilal and Arindam Chakrabarti, Knowing from Words (1994). These two volumes framed several issues in the epistemology of testimony and largely set the agenda for work in that area over the next two decades. -/- One major issue in this literature is whether testimonial knowledge can be "reduced" to some other (...) kind of knowledge: Is testimonial knowledge sui generis, requiring its own distinctive treatment, or is testimonial knowledge merely an instance of, for example, inductive knowledge, requiring no special epistemology over and above that required for inductive knowledge in general? One way that testimonial knowledge might be special is that it involves social elements that make it distinctive. This possibility raises further issues that have been prominent in the literature: In what ways is testimonial knowledge a social phenomenon, and what are the consequences of this for the epistemology of testimony and for epistemology more generally? (shrink)

L'opera sviluppa una riflessione politico-simbolica sul rapporto identità-alterità per rintracciare le valenze, che favoriscono il riconoscimento dell'incontro, al di là del possibile scontro alternativo escludente. Due i simboli politici esaminati, Prometeo e Cristo, che danno di che pensare, sollecitando a ri-pensare, il rapporto con l'altro. Aut aut: da una parte la croce di Cristo che simbolicamente, con i suoi bracci che si intersecano l'uno attraverso l'altro, rappresenta l'apertura della dimensione immanente, nella sua orizzontalità, a quella trascendente, nella sua verticalità, ossia (...) la tensione al supra e al prius quale esigenza di progresso ascensionale di ricerca del massimo bene umano; dall'altra la rupe di Prometeo, espressione dell'attaccamento ctonico al piano immanente, che, se assolutizzato, opprime e mortifica l'essere incatenandolo e affossandolo. Con un'originale apertura della politica alla pedagogia, l'autrice affronta la questione cruciale del la libertà che, intesa come liberazione responsabile dall'insignificanza all'infinito, richiede di essere educata per rendere concretamente possibile il progetto di una convivenza più autenticamente umana. (shrink)

Plural expressions found in natural languages allow us to talk about many objects simultaneously. Plural logic — a logical system that takes plurals at face value — has seen a surge of interest in recent years. This book explores its broader significance for philosophy, logic, and linguistics. What can plural logic do for us? Are the bold claims made on its behalf correct? After introducing plural logic and its main applications, the book provides a systematic analysis of the relation between (...) this logic and other theoretical frameworks such as set theory, mereology, higher-order logic, and modal logic. The applications of plural logic rely on two assumptions, namely that this logic is ontologically innocent and has great expressive power. These assumptions are shown to be problematic. The result is a more nuanced picture of plural logic's applications than has been given thus far. Questions about the correct logic of plurals play a central role in the final chapters, where traditional plural logic is rejected in favor of a "critical" alternative. The most striking feature of this alternative is that there is no universal plurality. This leads to a novel approach to the relation between the many and the one. In particular, critical plural logic paves the way for an account of sets capable of solving the set-theoretic paradoxes. (shrink)

This paper advocates for a “social turn" in religious epistemology. Part One reviews some familiar skeptical arguments targeting religious belief (the argument from luck, the argument from peer disagreement, Hume's argument). All these skeptical arguments say that testimonial evidence cannot give religious belief adequate support or grounding, especially in the context of conflicting evidence. Part Two considers some recent work in social epistemology and the epistemology of testimony. Several issues regarding the nature of testimonial evidence are considered, and an account (...) of testimonial evidence as a means of distribution of information through the system is defended. Part Three uses the results of Part Two to reconsider the skeptical arguments in Part One. (shrink)

It's standard in epistemology to approach questions about knowledge and rational belief using idealized, simplified models. But while the practice of constructing idealized models in epistemology is old, metaepistemological reflection on that practice is not. Greco argues that the fact that epistemologists build idealized models isn't merely a metaepistemological observation that can leave first-order epistemological debates untouched. Rather, once we view epistemology through the lens of idealization and model-building, the landscape looks quite different. Constructing idealized models is likely the (...) best epistemologists can do. Once one starts using epistemological categories like belief, knowledge, and confidence, the realm of idealization and model-building is entered. We can object to a model of knowledge by pointing to a better model, but in the absence of a better model, the fact that a framework for epistemologizing theorizing involves simplifications, approximations, and other inaccuracies-the fact of its status as an idealized model-is not in itself objectionable. Once we accept that theorizing in epistemological terms is inescapably idealized, a number of intriguing possibilities open up. Greco defends a package of epistemological views that might otherwise have looked indefensibly dismissive of our cognitive limitations-a package according to which we know a wide variety of facts with certainty, including what our evidence is, what we know and don't know, and what follows from our knowledge. (shrink)

We construct an explicit covariant Majorana formulation of Maxwell electromagnetism which does not make use of vector 4-potential. This allows us to write a “Dirac” equation for the photon containing all the known properties of it. In particular, the spin and (intrinsic) boost matrices are derived and the helicity properties of the photon are studied.

This biography sheds new light on the life and work of physicist Ettore Majorana (including unpublished contributions), as well as on his mysterious disappearance in March 1938. Majorana is held by many, including Nobel Laureate, Enrico Fermi, to have been a genius of the rank of Galilei and Newton. In this intriguing story, the author, himself a leading expert on the work of Majorana, supplements the existing literature with new insights, anecdotes and personal accounts of contemporaries of Majorana.