Suppose a committee or a jury confronts a complex question, the answer to which requires attending to several sub-questions. Two different voting procedures can be used. On one, the committee members vote on each sub-question and the voting results are used as premises for the committee’s conclusion on the main issue. This premise-based procedure can be contrasted with the conclusion-based approach, which requires the members to directly vote on the conclusion, with the vote of each member being guided by her (...) views on the relevant sub-questions. The two procedures are not equivalent: There may be a majority of voters supporting each of the premises, but if these majorities do not significantly overlap, there will be a majority against the conclusion. Pettit (2001) connects the choice between the two procedures with the discussion of deliberative democracy. The problem we want to examine instead concerns the relative advantages and disadvantages of the two procedures from the epistemic point of view. Which of them is better when it comes to tracking truth? As it turns out, the answer is not univocal. On the basis of Condorcet’s jury theorem, the premise-based procedure can be shown to be superior if the objective is reach truth for the right reasons, without making any mistakes on the way. However, if the goal instead is to reach truth for whatever reasons, right or wrong, there will be cases in which using the conclusion-based procedure turns out to be more reliable, even though, for the most part, the premise-based procedure will retain its superiority. (shrink)

In her engaging book, The referential mechanism of proper names, Li presents empirical studies involving American and Chinese laypeople. Li interprets her results as supporting an epistemic‐perspective reading of the variability in referential intuitions on proper names. Building upon this thesis, Li defends the ambiguity view, claiming that names are ambiguous between a descriptivist and a causal‐historical meaning. I argue that either Li's data do not enable a comparison of the two theories of reference, or support for the (...) ambiguity view is limited to the Chinese sample at most and does not rely upon the inference that Li employs. (shrink)

Concerns with cultural variation and epistemic perspectives have played major roles in experimental semantics. They dominate Li's book (2023). Li's own experimental work provides two promising explanations of the cultural variation: Chinese, but not Americans, tend to agree with a character's false statement because they think it is not her fault that she is wrong or because they are socially conforming. So, the notice argues, the cultural variation is a red herring to the theory of reference. Li preferred explanation (...) is that Chinese and Americans take different epistemic perspectives. The notice argues that this is misguided and another red herring. (shrink)

There has been considerable recent interest in the consequences of closed timelike curves (CTCs) for the dynamics of quantum mechanical systems. A vast majority of research into this area makes use of the dynamical equations developed by Deutsch, which were developed from a consistency condition that assumes that mixed quantum states uniquely describe the physical state of a system. We criticize this choice of consistency condition from an epistemic perspective, i.e., a perspective in which the quantum state (...) represents a state of knowledge about a system. We demonstrate that directly applying Deutsch’s condition when mixed states are treated as representing an observer’s knowledge of a system can conceal time travel paradoxes from the observer, rather than resolving them. To shed further light on the appropriate dynamics for quantum systems traversing CTCs, we make use of a toy epistemic theory with a strictly classical ontology due to Spekkens and show that, in contrast to the results of Deutsch, many of the traditional paradoxical effects of time travel are present. (shrink)

This paper addresses a problem for theories of epistemic democracy. In a decision on a complex issue which can be decomposed into several parts, a collective can use different voting procedures: Either its members vote on each sub-question and the answers that gain majority support are used as premises for the conclusion on the main issue, or the vote is conducted on the main issue itself. The two procedures can lead to different results. We investigate which of these procedures (...) is better as a truth-tracker, assuming that there exists a true answer to be reached. On the basis of the Condorcet jury theorem, we show that the pbp is universally superior if the objective is to reach truth for the right reasons. If one instead is after truth for whatever reasons, right or wrong, there will be cases in which the cbp is more reliable, even though, for the most part, the pbp still is to be preferred. (shrink)

In this paper, we explore and discuss the use of the concept of being affected in biomedical decision making processes in Germany. The corresponding German term ‘Betroffenheit’ characterizes on the one hand a relation between a state of affairs and a person and on the other an emotional reaction that involves feelings like concern and empathy with the suffering of others. An example for the increasing relevance of being affected is the postulation of the participation of people with disabilities and (...) chronic or acute diseases in the discourse, as partly realized in the German National Ethics Council or the Federal Joint Committee. Nevertheless, not only on the political level, the resistance against the participation of affected people is still strong; the academic debate seems to be cross-grained, too. Against this background, we explore the meaning and argumentative role of the concept of being affected as it is used by affected and lay people themselves. Our analysis is based on four focus group discussions in which lay people, patients and relatives of patients discuss their attitudes towards biomedical interventions such as organ transplantation and genetic testing. This setting allows for a comparison of how affected and non-affected people are concerned and deliberate about medical opportunities, but also of how they position themselves as being affected or non-affected with respect to (scientific) knowledge and morality. On this basis, we discuss the normative relevance of being affected for the justification of political participation. (shrink)

Suppose a committee or a jury confronts a complex question, the answer to which requires attending to several sub-questions. Two different voting procedures can be used. On one, the committee members vote on each sub-question and the voting results are used as premises for the committee’s conclusion on the main issue. This premise-based procedure can be contrasted with the conclusion-based approach, which requires the members to directly vote on the conclusion, with the vote of each member being guided by her (...) views on the relevant sub-questions. The two procedures are not equivalent: There may be a majority of voters supporting each of the premises, but if these majorities do not significantly overlap, there will be a majority against the conclusion. Pettit (2001) connects the choice between the two procedures with the discussion of deliberative democracy. The problem we want to examine instead concerns the relative advantages and disadvantages of the two procedures from the epistemic point of view. Which of them is better when it comes to tracking truth? As it turns out, the answer is not univocal. On the basis of Condorcet’s jury theorem, the premise-based procedure can be shown to be superior if the objective is reach truth for the right reasons, without making any mistakes on the way. However, if the goal instead is to reach truth for whatever reasons, right or wrong, there will be cases in which using the conclusion-based procedure turns out to be more reliable, even though, for the most part, the premise-based procedure will retain its superiority. (shrink)

In a scenario characterized by unpredictable developments, such as the recent COVID-19 pandemic, epidemiological models have played a leading part, having been especially widely deployed for forecasting purposes. In this paper, two real-world examples of modeling are examined in support of the proposition that science can convey inconsistent as well as genuinely perspectival representations of the world. Reciprocally inconsistent outcomes are grounded on incompatible assumptions, whereas perspectival outcomes are grounded on compatible assumptions and illuminate different aspects of the same object (...) of interest. In both cases, models should be viewed as expressions of specific assumptions and unconstrained choices on the part of those designing them. The coexistence of a variety of models reflects a primary feature of science, namely its pluralism. It is herein proposed that recent over-exposure to science’s inner workings and disputes such as those pertaining to models, may have led the public to perceive pluralism as a flaw—or more specifically, as disunity or fragmentation, which in turn may have been interpreted as a sign of unreliability. In conclusion, given the inescapability of pluralism, suggestions are offered as to how to counteract distorted perceptions of science, and thereby enhance scientific literacy. (shrink)

This article explores whether perspective taking has an impact on the ascription of epistemic states. To do so, a new method is introduced which incites participants to imagine themselves in the position of the protagonist of a short vignette and to judge from her perspective. In a series of experiments, perspective proves to have a significant impact on belief ascriptions, but not on knowledge ascriptions. For belief, perspective is further found to moderate the epistemic (...) side-effect effect significantly. It is hypothesized that the surprising findings are driven by the special epistemic authority we enjoy in assessing our own belief states, which does not extend to the assessment of our own knowledge states. (shrink)

This thesis aims to advance evolutionary and epistemological knowledge of Middle and Late Pleistocene paleoanthropology, focusing on four main processes at the basis of cutting-edge research on modern human origins and evolution. These are the speciation of Homo sapiens, the transition to behavioural modernity, admixture with archaic hominin species outside Africa and human niche construction and global range expansion, here approached from the perspective of the current climate crisis. First, an extended single-origin of Homo sapiens will be defended on (...) evidential and evolutionary grounds, arguing that the paleoclimatic and paleoenvironmental context of Middle Pleistocene Africa likely favoured an allopatric speciation process from a widespread and diversified ancestral population. Then the thesis will move to the behavioural and archaeological side of the origin problem. I will analyse the evolution of the research agenda on “behavioural modernity”, developing a philosophical account of “investigative disintegration” and criticizing Rubicon-based approaches that have not kept up with new standards of explanatory adequacy. I will then turn to paleogenomic research and discuss evidence of archaic admixture with respect to the taxonomic status of Homo sapiens and Neanderthals. I will approach the apparent conflict between molecular and morphology-based taxonomies from a diachronic perspective on lineage divergence and from an integrative perspective on different species conceptions and delimitation criteria, justifying distinct specific status on such grounds. Finally, I will frame anthropogenically-driven climate change as a niche construction process played at a global scale, having deep roots in Homo sapiens evolutionary history and long-term consequences that today require a counteractive response to prior actions to deviate from a potential evolutionary trap. (shrink)

This paper addresses a problem for theories of epistemic democracy. In a decision on a complex issue which can be decomposed into several parts, a collective can use different voting procedures: Either its members vote on each sub-question and the answers that gain majority support are used as premises for the conclusion on the main issue, or the vote is conducted on the main issue itself. The two procedures can lead to different results. We investigate which of these procedures (...) is better as a truth-tracker, assuming that there exists a true answer to be reached. On the basis of the Condorcet jury theorem, we show that the pbp is universally superior if the objective is to reach truth for the right reasons. If one instead is after truth for whatever reasons, right or wrong, there will be cases in which the cbp is more reliable, even though, for the most part, the pbp still is to be preferred. (shrink)

This book presents a nonstandard approach to epistemology. Where standard epistemology generally focuses on the certain knowledge the Greeks called epistêmê, the present focus is on some less assured modes of information. Its deliberations focus on such cognitively suboptimal processes as conjecture, guesswork, and plausible supposition.

This volume features new perspectives on the topic of epistemic closure. It connects epistemic closure principles to related themes in epistemology such as scepticism, dogmatism, evidentialism, epistemic logic, and modal epistemology.

Many epistemologists endorse true-belief monism, the thesis that only true beliefs are of fundamental epistemic value. However, this view faces formidable counterexamples. In response to these challenges, we alter the letter, but not the spirit, of true-belief monism. We dub the resulting view “inquisitive truth monism”, which holds that only true answers to relevant questions are of fundamental epistemic value. Which questions are relevant is a function of an inquirer’s perspective, which is characterized by his/her interests, social (...) role, and background assumptions. Using examples of several different scientific practices, we argue that inquisitive truth monism outperforms true-belief monism. (shrink)

Some influential interpreters of Dharmakīrti have suggested understanding his thought in terms of a ‘sliding scale of analysis.’ Here it is argued that this emphasis on Dharmakīrti's alternating philosophical perspectives, though helpful in important respects, obscures the close connection between the two views in play. Indeed, with respect to these perspectives as Dharmakīrti develops them, the epistemology is the same either way. Insofar as that is right, John Dunne's characterization of Dharmakīrti's Yogācāra as ‘epistemic idealism ’ may not, after (...) all, distinguish this perspective from Sautrāntika; indeed, epistemic idealism can be understood as just the view these positions share. Thus, what distinguishes the ‘Yogācāra’ section of Dharmakīrti's texts is simply his making explicit that epistemological commitments the Sautrāntika does hold are already compatible with idealism. Sautrāntika and Yogācāra thus differ only when one turns to the metaphysical arguments that additionally show that only such mental things as sense data could be real. (shrink)

Imagine that Ann, asked to name her favorite treat, answers: 1. Licorice is tasty Imagine that Ben, having hidden some licorice in the cupboard, whispers to Ann: 2. There might be licorice in the cupboard. What if any role is played by perspective—whom the licorice is tasty to, whose evidence allows for licorice in the cupboard—in the semantics of such sentences?

Many epistemologists endorse true-belief monism, the thesis that only true beliefs are of fundamental epistemic value. However, this view faces formidable counterexamples. In response to these challenges, we alter the letter, but not the spirit, of true-belief monism. We dub the resulting view “inquisitive truth monism,” which holds that only true answers to relevant questions are of fundamental epistemic value. Which questions are relevant is a function of an inquirer’s perspective, which is characterized by his/her interests, social (...) role, and background assumptions. Using examples of several different scientific practices, we argue that inquisitive truth monism outperforms true-belief monism. (shrink)

This book digs into the complex archaeology of empathy illuminating controversies, epistemic problems and unanswered questions encapsulated within its cross-disciplinary history. The authors ask how a neutral innate capacity to directly understand the actions and feelings of others becomes charged with emotion and moral values associated with altruism or caregiving. They explore how the discovery of the mirror neuron system and its interpretation as the neurobiological basis of empathy has stimulated such an enormous body of research and how in (...) a number of these studies, the moral values and social attitudes underlying empathy in human perception and action are conceptualized as universal traits. It is argued that in the humanities the historical, cultural and scientific genealogies of empathy and its forerunners, such as Einfühlung, have been shown to depend on historical preconditions, cultural procedures, and symbolic systems of production. The multiple semantics of empathy and related concepts are discussed in the context of their cultural and historical foundations, raising questions about these cross-disciplinary constellations. This volume will be of interest to scholars of psychology, art history, cultural research, history of science, literary studies, neuroscience, philosophy and psychoanalysis. (shrink)

A number of philosophers, going back at least to Kierkegaard, argue that to have faith in something is, in part, to have a passion for that thing—to possess a lasting, formative disposition to feel certain positive patterns of emotion towards the object of faith. I propose that (at least some of) the intellectual dimensions of faith can be modeled in much the same way. Having faith in a person involves taking a certain perspective towards the object of faith—in possessing (...) a lasting, formative disposition for things to seem as though the object of faith is worthy of one’s trust. After developing the view, I briefly discuss its epistemic implications. I suggest that, by systematically reorienting how one experiences the world, faith can actually change one’s total body of evidence (or perhaps even how one weighs that evidence), thereby altering what one is justified in believing about the object of faith. (shrink)

This paper focuses on the relation between epistemic reasons and the subject’s epistemic perspective. It tackles the questions of whether epistemic reasons are dependent on the perspective of the subject they are reasons for, and if so, whether they are dependent on the actual or the potential perspective. It is argued that epistemic reasons are either independent or minimally dependent on the subject’s epistemic perspective. In particular, I provide three arguments supporting (...) the conclusion that epistemic reasons are not dependent on the subject’s actual perspective. Furthermore, I show that variants of these arguments apply against popular views holding that epistemic reasons depend on the subject’s potential perspective, such as the view that epistemic reasons are facts that one is in a position to know. (shrink)

This article is a study of the development of modern European cuisine through an examination of the socio-cognitive schemas which shape the way social actors think of and about food. While the historical phase that spans from the late middle ages to modernity has been widely studied (mainly by historians) I advance a new interpretation which focuses on the influence of cognitive patterns on the structure of cuisine — the ways of eating, cooking and serving food. I argue that the (...) shift in the mode of classification helps explain the origin of the modern configuration of cuisine built on the polarity between the sweet and savory tastes. Using the case of cuisine, I propose to see the cultural schemas which define thinking in a socio-historical context as providing the conditions of possibility for transformations in a cultural sphere to occur. This article thus attempts to contribute to our understanding of the relation between cultural practices and cognitive schemas. (shrink)

Dynamic epistemic logics provide an account of the evolution of agents’ belief and knowledge when they learn the occurrence of an event. These logics started to become popular about 20 years ago and by now there exists a huge number of publications about them. The present paper briefly summarises the existing body of literature, discusses some problems and shortcomings, and proposes some avenues for future research.

The papers collected in this book share a common motivation: All respond to certain kinds of injustice that unfairly and unreasonably prevent the insights and intellectual abilities of vulnerable and stigmatized groups from being given their due recognition. Most people are opposed to injustice in principle, and do not want to have mistaken views about others. But research in the social sciences reveals a disturbing truth: Even people who intend to be fair-minded and unprejudiced are influenced by unconscious biases and (...) stereotypes, as well as social structures and institutions that lead to unjust judgments. We may sincerely want to be epistemically just, but we frequently fail, and simply thinking harder about it will not fix the problem. -/- This volume collects 17 new essays that draw from cutting-edge social science research, to suggest how we can better manage our own unjust reactions, as well as resist patterns of epistemic injustice that we may face. The volume concludes with an afterward by Miranda Fricker, reflecting on these new lines of research and potential future directions to explore. (shrink)

Background There is a growing concern about artificial intelligence (AI) applications in healthcare that can disadvantage already under-represented and marginalised groups (eg, based on gender or race). Objectives Our objectives are to canvas the range of strategies stakeholders endorse in attempting to mitigate algorithmic bias, and to consider the ethical question of responsibility for algorithmic bias. Methodology The study involves in-depth, semistructured interviews with healthcare workers, screening programme managers, consumer health representatives, regulators, data scientists and developers. Results Findings reveal considerable (...) divergent views on three key issues. First, views on whether bias is a problem in healthcare AI varied, with most participants agreeing bias is a problem (which we call the bias-critical view), a small number believing the opposite (the bias-denial view), and some arguing that the benefits of AI outweigh any harms or wrongs arising from the bias problem (the bias-apologist view). Second, there was a disagreement on the strategies to mitigate bias, and who is responsible for such strategies. Finally, there were divergent views on whether to include or exclude sociocultural identifiers (eg, race, ethnicity or gender-diverse identities) in the development of AI as a way to mitigate bias. Conclusion/significance Based on the views of participants, we set out responses that stakeholders might pursue, including greater interdisciplinary collaboration, tailored stakeholder engagement activities, empirical studies to understand algorithmic bias and strategies to modify dominant approaches in AI development such as the use of participatory methods, and increased diversity and inclusion in research teams and research participant recruitment and selection. (shrink)

“Epistemic safety” refers to an epistemic status in which the subject acquires true beliefs without involving epistemic luck. There is a tradition of cashing out safety-defining modality in terms of possible world semantics, and even Julian Dutant's and Martin Smith's normalcy-based notions of safety also take this semantics as a significant component of them. However, such an approach has to largely depend on epistemologists’ ad hoc intuitions on how to individuate possible worlds and how to pick out (...) “close” worlds. In contrast, I propose a probabilistic approach to safety to maximally preclude the preceding type of ad hoc-ness. The main idea is as follows: Each epistemic vignette wherein a subject S holds a true belief p has to be evaluated by a safety-ascriber, hence, S holds a true belief p safely iff according to the safety-ascriber's evaluation, the probability of the occurrence of the truth-maker of p is above a pre-fixed “safety threshold”. My theory will be applied to Lottery Cases, Gettierized Cases and Skeptical Cases to test the scope of its applicability. (shrink)

We present the Jaina theory of sevenfold predication as a 7-valued logic, in which every logical value consists in a 3-tuple of opinions. A question-answer semantics is used in order to give an intuitive characterization of these logical values in terms of opinion polls. Two different interpretations are plausible for the latest sort of opinion, depending upon whether "non-assertability" refers to incompleteness or inconsistency. It is shown hat the incomplete version of JL_{G} is equivalent to Kleene's logic K3, whereas the (...) inconsistent version of JL_{M} is equivalent to Priest's Logic of Paradox LP. Finally, it is argued that the Indian logics depart from Western logics by conflating truth and justified belief: the different preconditions for belief ascription accounts for the difference between pluralist and skeptic logics. (shrink)

This article examines the emergent relationship between epistemic responsibility and frame awareness in early childhood, wherein a mother uses language socialization practices to guide her child into a new frame. The pair co-constructs the parameters of the new frame through negotiation of epistemic responsibility and remedial interchanges. The analysis demonstrates that these remedial interchanges arise from conflicting understandings of the embeddedness of frames and the epistemic dynamics that these frames entail. The child maintains epistemic primacy in (...) her concurrent play frame, which carries over to the recording activity given that the recording activity is embedded within her larger play frame. I argue that the data predict epistemic responsibility to be acquired earlier than the ability to shift epistemic dynamics outside of role-play. This study contributes to our understanding of frame and epistemic development in early childhood. (shrink)

It is generally accepted that the development of the modern sciences is rooted in experiment. Yet for a long time, experimentation did not occupy a prominent role, neither in philosophy nor in history of science. With the ‘practical turn’ in studying the sciences and their history, this has begun to change. This paper is concerned with systems and cultures of experimentation and the consistencies that are generated within such systems and cultures. The first part of the paper exposes the forms (...) of historical and structural coherence that characterize the experimental exploration of epistemic objects. In the second part, a particular experimental culture in the life sciences is briefly described as an example. A survey will be given of what it means and what it takes to analyze biological functions in the test tube. (shrink)

The primary objective of this paper is to examine the connections between the diversityof methodological approaches—characteristic of methodological pluralism—and non-conventional economic perspectives—characteristic of heterodox economics— while also exploring two related concepts: the reciprocal influence between disciplines and epistemic peer disagreement. Initially, the fundamental categories of methodological pluralism in economic sciences will be presented. Subsequently, the points of convergence and divergence between alternative economic theories and mainstream economic thought will be analyzed. The third section of the paper will explore the (...) potential relationship between pluralism and the incorporation of ideas from other disciplines into economics. Finally, the article will examine how a genuine exchange of ideas between conciliatory perspectives in cases of epistemic peer disagreement could enrich both non-conventional economic approaches and more widely accepted theories. (shrink)

Epistemic closure has been a central issue in epistemology over the last forty years. According to versions of the relevant alternatives and subjunctivist theories of knowledge, epistemic closure can fail: an agent who knows some propositions can fail to know a logical consequence of those propositions, even if the agent explicitly believes the consequence (having “competently deduced” it from the known propositions). In this sense, the claim that epistemic closure can fail must be distinguished from the fact (...) that agents do not always believe, let alone know, the consequences of what they know—a fact that raises the “problem of logical omniscience” that has been central in epistemic logic. This paper, part I of II, is a study of epistemic closure from the perspective of epistemic logic. First, I introduce models for epistemic logic, based on Lewis’s models for counterfactuals, that correspond closely to the pictures of the relevant alternatives and subjunctivist theories of knowledge in epistemology. Second, I give an exact characterization of the closure properties of knowledge according to these theories, as formalized. Finally, I consider the relation between closure and higher-order knowledge. The philosophical repercussions of these results and results from part II, which prompt a reassessment of the issue of closure in epistemology, are discussed further in companion papers. As a contribution to modal logic, this paper demonstrates an alternative approach to proving modal completeness theorems, without the standard canonical model construction. By “modal decomposition” I obtain completeness and other results for two non-normal modal logics with respect to new semantics. One of these logics, dubbed the logic of ranked relevant alternatives, appears not to have been previously identified in the modal logic literature. More broadly, the paper presents epistemology as a rich area for logical study. (shrink)

In their contribution to the rapidly developing field of research on psychedelic medicine, Glenn Cohen and Mason Marks shed light on a frequently overlooked but critical aspect of ethical considera...

The article elaborates on the concept of ethics, noting the contrasting definitions of morality virtue-based and rule-based ethics. It highlights the related distinction between virtue epistemology and rule epistemology, stating that the main difference lies in the appreciation of the ethics of belief by either discipline. It also discusses the claim by philosopher Linda Zagzebski that epistemology is a branch of ethics, focusing on the contrary arguments including the perspectives of Saint Thomas Aquinas.

Expressions of epistemic modality mark the possibility/necessity of the prejacent proposition relative to some body of evidence/knowledge.

In Epistemic Entitlement. The Right to Believe Hannes Ole Matthiessen develops a social externalist account of epistemic entitlement and perceptual knowledge. The basic idea is that positive epistemic status should be understood as a specific kind of epistemic right, that is a right to believe. Since rights have consequences for how others are required to treat the bearer of the right, they have to be publicly accessible. The author therefore suggests that epistemic entitlement can plausibly (...) be conceptualized as a status that is grounded in a publicly observable perceptual situation, rather than in a perceptual experience as current theories of epistemic entitlement state. It is then argued that such a social externalist account of entitlement, in which the perceiver's epistemic perspective becomes relevant only in the exceptional case where an entitlement is challenged, can nevertheless do justice to our central intuitions about first-personal epistemic phenomenology. (shrink)

This chapter investigates the problem of knowledge production on economic poverty in Africa as, largely, an instance of epistemic injustice. It applies Karl Popper’s critical rationalism to the issue of knowledge production on poverty. Methodologies of researches on poverty in Africa subtly promotes intended epistemic injustices against the subjects as the poor are underrepresented in knowledge about them; the experiences of the poor are often ignored, and their epistemic capacity for unearthing the push and pull factors of (...) poverty are greeted with much inferiority, skepticism and contempt. In severing the intersection between researching and reporting poverty in Africa and epistemic injustice, this chapter argues that Popper’s critical rationalism is philosophically indispensable. Popper’s scientific and political thoughts are potent theoretical interventions in addressing the epistemic, methodological, social, moral and political problems of poverty in Africa. The elements of scientific method inquiry, rationality, piecemeal social engineering, liberalism and intellectual openness explicit in Popper’s philosophy are explored, applied and found relevant to promoting poverty research ideals and policy development in Africa and beyond. The chapter concludes on the importance of Popper’s works, which span beyond his time and space, to knowledge about Africa. (shrink)

In this paper we present a modal logic framework to reason about the expertise of information sources. A source is considered an expert on a proposition φ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varphi $$\end{document} if they are able to correctly refute φ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varphi $$\end{document} in any possible world where φ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varphi $$\end{document} is false. Closely connected with expertise is a notion of (...) soundness of information: φ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varphi $$\end{document} is said to be “sound” if it is true up to lack of expertise of the source. That is, any statement logically weaker than φ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varphi $$\end{document} on which the source has expertise must in fact be true. This is relevant for modelling situations in which sources make claims beyond their domain of expertise. Particular attention is paid to the connection between expertise and knowledge: we show that expertise and soundness admit precise interpretations in terms of S4 and S5 epistemic logic, under certain conditions. We go on to extend the framework to multiple sources, defining two notions of collective expertise. These also have epistemic interpretations via distributed and common knowledge from multi-agent epistemic logic. On the technical side, we give several sound and complete axiomatisations of various classes of expertise models. (shrink)