While no classicist would deny that Quintilian’s “Institutio oratoria” is the most complete handbook of rhetoric transmitted from Antiquity, the work is usually mined for its information on both the Roman educational system and technical aspects of the art of speaking. The “Institutio” may be useful as a guide to eloquence, but its author frequently hints to higher aspirations. This article focuses on the literary merits of the “Institutio”, arguing that it deliberately competes with the poetical works of Horace, Vergil, (...) and, possibly, Statius. (shrink)

Many logical systems today describe intelligent interacting agents over time. Frameworks include Interpreted Systems (IS, Fagin et al. [8]), Epistemic-Temporal Logic (ETL, Parikh & Ramanujam [22]), STIT (Belnap et al. [5]), Process Algebra and Game Semantics (Abramsky [1]). This variety is an asset, as different modeling tools can be fine-tuned to specific applications. But it may also be an obstacle, when barriers between paradigms and schools go up. This paper takes a closer look at one particular interface, between two systems (...) that both address the dynamics of knowledge and information flow in multi-agent systems. One is IS/ETL (IS and ETL are, from a technical point of view, the same up to model transformations, cf. [20]), which uses linear or branching time models with added epistemic structure induced by agents’ different capabilities for observing events. These models provide a Grand Stage where histories of some process unfold constrained by a protocol, and a matching epistemic-temporal language describes what happens. The other framework is Dynamic Epistemic Logic (DEL, [10, 4, 34]) that describes interactive processes in terms of epistemic event models which may occur inside modalities of the language. Temporal evolution is then computed from some initial epistemic model through a process of successive ‘product updates’. It has long been unclear how to best compare IS/ETL and DEL. Various aspects have been investigated in [10, 30, 32], but in this paper, we study the interface in a more systematic way. Often, DEL and ETL are presented as alternative ways of adding dynamics to multi-agent epistemic models. In this paper, we rather focus on how merging the two different modeling choices leads to interesting new questions. Our leading interest here will be a view of informational processes as evolving over time. To see what we mean, consider the simplest version of DEL, viz. the logic of public announcements PAL ([23]) which adds a very specific type of communicative 1 action to epistemic models: a public announcement.. (shrink)

In this paper we introduce Dynamic Epistemic Logic, which is alogic for reasoning about information change in a multi-agent system. Theinformation structures we use are based on non-well-founded sets, and canbe conceived as bisimulation classes of Kripke models. On these structures,we define a notion of information change that is inspired by UpdateSemantics (Veltman, 1996). We give a sound and complete axiomatization ofthe resulting logic, and we discuss applications to the puzzle of the dirtychildren, and to knowledge programs.

This essay discusses whether an indigenous African ethic, as expressed in ubuntu, may serve as an example of how to decolonise Western knowledge. In the first part, the key claims of decolonisation of knowledge are set out. The second part analyses three strategies to construct models of ‘African’ ethics, namely transfer, translation and stating of a substantive rival model as contained in ubuntu ethics. After a critical appraisal of this substantive proposal, part three indicates the potential and limitation of the (...) decolonisation project: possibilities lie in the -contextualisation of knowledge, whereas limitations are related to constructing an alternative to what is known as ‘scientific’ knowledge. As far as the author knows, this is the first attempt to frame ethics in terms of the epistemological search for ‘decolonised’ knowledge. (shrink)

The rise of Big Data changes the context in which organisations producing official statistics operate. Big Data provides opportunities, but in order to make optimal use of Big Data, a number of challenges have to be addressed. This stimulates increased collaboration between National Statistical Institutes, Big Data holders, businesses and universities. In time, this may lead to a shift in the role of statistical institutes in the provision of high-quality and impartial statistical information to society. In this paper, the changes (...) in context, the opportunities, the challenges and the way to collaborate are addressed. The collaboration between the various stakeholders will involve each partner building on and contributing different strengths. For national statistical offices, traditional strengths include, on the one hand, the ability to collect data and combine data sources with statistical products and, on the other hand, their focus on quality, transparency and sound methodology. In the Big Data era of competing and multiplying data sources, they continue to have a unique knowledge of official statistical production methods. And their impartiality and respect for privacy as enshrined in law uniquely position them as a trusted third party. Based on this, they may advise on the quality and validity of information of various sources. By thus positioning themselves, they will be able to play their role as key information providers in a changing society. (shrink)

We formulate a formal framework in which we combine the theory of dynamic epistemic logic and the theory of games. In particular, we show how we can use tools of dynamic epistemic logic to reason about information change ? and in particular, the effect of communication acts ? in such a game of imperfect information. We show how this framework allows for the formulation of specific assumptions in pragmatics of communication, as well as the formulation of general results about the (...) value of information. (shrink)

A variety of logical frameworks have been developed to study rational agents interacting over time. This paper takes a closer look at one particular interface, between two systems that both address the dynamics of knowledge and information flow. The first is Epistemic Temporal Logic (ETL) which uses linear or branching time models with added epistemic structure induced by agents’ different capabilities for observing events. The second framework is Dynamic Epistemic Logic (DEL) that describes interactive processes in terms of epistemic event (...) models which may occur inside modalities of the language. This paper systematically and rigorously relates the DEL framework with the ETL framework. The precise relationship between DEL and ETL is explored via a new representation theorem characterizing the largest class of ETL models corresponding to DEL protocols in terms of notions of Perfect Recall , No Miracles , and Bisimulation Invariance . We then focus on new issues of completeness . One contribution is an axiomatization for the dynamic logic of public announcements constrained by protocols, which has been an open problem for some years, as it does not fit the usual ‘reduction axiom’ format of DEL. Finally, we provide a number of examples that show how DEL suggests an interesting fine-structure inside ETL. (shrink)

This paper seeks to show that the proposition of 'double contingency' introduced by Parsons and defended by Luhmann and Habermas is insufficient under the conditions of contemporary communication societies. In the latter context, the increasing differentiation and organization of communication processes eventuated in the recognition of the epistemic authority of the public, which in turn compels us to conceptualize a new level of contingency. A first step is therefore taken to capture the role of the public in communication societies theoretically (...) by what may be called 'triple contingency'. Since the process of the definition of reality and its outcome, to which the response of the public is central, is best seen in constructivist terms, attention is also paid to relevant methodological and epistemological questions. Key Words: cognitive turn • communication • constructivism • double contingency • Habermas • Luhmann • observation • Parsons • situationalism • the third point of view. (shrink)

We examine the paradox of the surprise examination using dynamic epistemic logic. This logic contains means of expressing epistemic facts as well as the effects of learning new facts, and is therefore a natural framework for representing the puzzle. We discuss a number of different interpretations of the puzzle in this context, and show how the failure of principle of success, that states that sentences, when learned, remain to be true and come to be believed, plays a central role in (...) understanding the puzzle. (shrink)

Instead of speaking of conscious experience as arising in a brain, we prefer to speak of a brain as arising in conscious experience. From an epistemological standpoint, starting from direct experiences strikes us as more justified. As a first option, we reconsider the ‘hard problem’ of the relation between conscious experience and the physical world by thus turning that problem upside down. We also consider a second option: turning the hard problem sideways. Rather than starting with the third-person approach used (...) in physics, or the first- person approach of starting with individual conscious experience, we consider starting from an I-and-you basis, centered around the second-person. Finally, we present a candidate for what could be considered to underlie conscious experience: ‘sense’. We consider this to be a shot in the dark, but at least a shot in the right direction: somewhere between upside down and sideways. Our notion of sense can be seen as an alternative to panpsychism. To give an analogy, using the notions of space and time is more convenient than trying to analyse the phenomenon of motion in terms of a space-based ‘pandynamism’. Similarly, when approaching the phenomenon of consciousness, we prefer the triad of space, time and sense, over a spacetime-based form of panpsychism. (shrink)

Since the emergence of neo-evolutionism in the 1960s, various critiques of the theory of social or socio-cultural evolution have been forwarded, including notably those of Immanuel Wallerstein, Alain Touraine and Anthony Giddens who decisively reject the idea of evolution. Within this context, Jürgen Habermas's theory of socio-cultural evolution has also become a specific object of critique, the best known in the English-speaking world being, perhaps, Michael Schmid's critique. While the latter is ultimately based on neo-Darwinistic assumptions which allow a non-Marxist (...) alternative to be pitted against Habermas's position, a significant immanent critique has been taking shape during the late 1970s and 1980s the contours of which are at present starting to become visible, despite the fact that as yet it is nowhere developed and presented in a systematic manner. I have in mind here the work of younger authors belonging to the circle around Habermas, such as Johann Arnason, Axel Honneth, Hans Joas, Günter Frankenberg, Ulrich Rödel, and Klaus Eder, who have not only developed a critique of Habermas but are also engaged in developing an alternative to him within the framework of critical theory. (shrink)

This article presents the results of a discourse analysis of press coverage on the Quantified Self (QS) movement in the German and British (online) press between 2007 and 2018. The analysis is driven by two questions: What discursive patterns can be discerned within this coverage? And, what characterizes the translation of the experimental practices and imaginaries of this pioneer community into an overall societal reflection of deep mediatization? In essence, the article shows that the QS movement becomes a ‘general signifier’ (...) for a dystopian view of deep mediatization. So, while the QS movement itself understands its practices and community as self-empowering, self-reasoning, and experimental, the constructions of the QS movement in public discourse suggest the opposite. Paradoxically, however, another basic imaginary of the pioneer community is adopted and confirmed, namely that of the (simple) mutability of society as a consequence of digital media technologies. (shrink)

ABSTRACT:Demands have been growing upon firms to take actions in the interests of workers, the environment, local communities, and others. Firms sometimes have felt they could best discharge such responsibilities by cooperating with other firms. This, however, is suspect from the point of view of a purely economic interpretation of competition law, since interfirm agreements may raise prices and thus lower welfare for consumers. Should competition law remain focused on competition enhancing economic welfare, or be reformed to allow for acts (...) of cooperation that are socially beneficial? To answer this question, the article provides a philosophical reevaluation of the deep-seated view that firms are merely private actors. It argues that demands of political legitimacy should also be addressed at firms cooperating together, and that standard views of democratic accountability should be broadened, introducing a model of delegated, sequential decision making which allows regulatory agencies and parliaments to control interfirm agreements. (shrink)

We discuss the nature of reality in the ontological context of Penrose’s math-matter-mind triangle. The triangle suggests the circularity of the widespread view that math arises from the mind, the mind arises out of matter, and that matter can be explained in terms of math. Non-physicists should be wary of any claim that modern physics leads us to any particular resolution of this circularity, since even the sample of three theoretical physicists writing this paper hold three divergent views. Some physicists (...) believe that current physics has already found the basic framework for a complete description of reality, and only has to fill in the details. Others suspect that no single framework, from physics or other sources, will ever capture reality. Yet others guess that reality might be approached arbitrarily closely by some form of future physics, but probably based on completely different frameworks. We will designate these three approaches as the fundamentalist, secular and mystic views of the world, as seen by practicing physicists. We present and contrast each of these views, which arguably form broad categories capturing most if not all interpretations of physics. We argue that this diversity in the physics community is more useful than an ontological monoculture, since it motivates physicists to tackle unsolved problems with a wide variety of approaches. (shrink)

Current dynamic-epistemic logics model different types of information change in multi-agent scenarios. We generalize these logics to a probabilistic setting, obtaining a calculus for multi-agent update with three natural slots: prior probability on states, occurrence probabilities in the relevant process taking place, and observation probabilities of events. To match this update mechanism, we present a complete dynamic logic of information change with a probabilistic character. The completeness proof follows a compositional methodology that applies to a much larger class of dynamic-probabilistic (...) logics as well. Finally, we discuss how our basic update rule can be parameterized for different update policies, or learning methods. (shrink)

A variety of logical frameworks have been developed to study rational agents interacting over time. This paper takes a closer look at one particular interface, between two systems that both address the dynamics of knowledge and information flow. The first is Epistemic Temporal Logic (ETL) which uses linear or branching time models with added epistemic structure induced by agents’ different capabilities for observing events. The second framework is Dynamic Epistemic Logic (DEL) that describes interactive processes in terms of epistemic event (...) models which may occur inside modalities of the language. This paper systematically and rigorously relates the DEL framework with the ETL framework. The precise relationship between DEL and ETL is explored via a new representation theorem characterizing the largest class of ETL models corresponding to DEL protocols in terms of notions of Perfect Recall, No Miracles, and Bisimulation Invariance. We then focus on new issues of completeness. One contribution is an axiomatization for the dynamic logic of public announcements constrained by protocols, which has been an open problem for some years, as it does not fit the usual ‘reduction axiom’ format of DEL. Finally, we provide a number of examples that show how DEL suggests an interesting fine-structure inside ETL. (shrink)

The political philosopher Hannah Arendt develops several arguments regarding why truthfulness cannot be counted among the political virtues. This article shows that similar arguments apply to lying in business. Based on Hannah Arendt's theory, we distinguish five reasons why lying is a structural temptation to businessmen: business is about action to change the world and therefore businessmen need the capacity to deny current reality; commerce requires successful image-making and liars have the advantage to come up with plausible stories; business communication (...) is more often about opinions than about facts, giving leeway to ignore uncomfortable signals; business increasingly makes use of plans and models, but these techniques foster inflexibility in acknowledging the real facts; and businessmen easily fall prey to self-deception, because one needs to act as if the vision already materializes. The theory is illustrated by a case study of Landis, which grew from a relatively insignificant organization into a large one within a short period of time, but ended with outright lies and bankruptcy. (shrink)

Current dynamic-epistemic logics model different types of information change in multi-agent scenarios. We generalize these logics to a probabilistic setting, obtaining a calculus for multi-agent update with three natural slots: prior probability on states, occurrence probabilities in the relevant process taking place, and observation probabilities of events. To match this update mechanism, we present a complete dynamic logic of information change with a probabilistic character. The completeness proof follows a compositional methodology that applies to a much larger class of dynamic-probabilistic (...) logics as well. Finally, we discuss how our basic update rule can be parameterized for different update policies, or learning methods. (shrink)

Responding to a call for systematic contributions on the theory of society, the principle aim of this article is to recover and reconstruct the Young-Hegelian core of critical theory’s theory of the dialectical development of society and, on that basis, to project its creative research-based continuation by analysing its largely neglected key concept of possibility. The acknowledgement of the critical theory lineage’s naturalist, realist and especially idealist features leads this reconstruction to ascribe a central role to certain pivotal concepts that (...) deserve special attention – including nature, the construction of society, evolution, immanent–transcendence and the conceptual conditions or cognitive order of society. A side effect of this theoretical exposition is the exposure in the course of the argument of certain weaknesses often visible in the contemporary articulation of the theory of society in both critical theory and general social theory. Conceptual solutions to those deficiencies are simultaneously presented in a form appropriate to critical theory’s modal-based negative explanatory and positive disclosing critique. (shrink)

The political philosopher Hannah Arendt develops several arguments regarding why truthfulness cannot be counted among the political virtues. This article shows that similar arguments apply to lying in business. Based on Hannah Arendt's theory, we distinguish five reasons why lying is a structural temptation to businessmen: business is about action to change the world and therefore businessmen need the capacity to deny current reality; commerce requires successful image-making and liars have the advantage to come up with plausible stories; business communication (...) is more often about opinions than about facts, giving leeway to ignore uncomfortable signals; business increasingly makes use of plans and models, but these techniques foster inflexibility in acknowledging the real facts; and businessmen easily fall prey to self-deception, because one needs to act as if the vision already materializes. The theory is illustrated by a case study of Landis, which grew from a relatively insignificant organization into a large one within a short period of time, but ended with outright lies and bankruptcy. (shrink)

What can be the stage for a dialogue between Buddhism and Science? Calling Buddhism a religion is not a very accurate description, and the very notion that science might produce a world view is not correct, since there is still so much that is left out from a scientific description. At this point, it might be more prudent to start talking about mutual respect and inspiration between science and Buddhism, with an eye toward future more detailed discussions. One way of (...) phrasing a possible middle ground between both is to start by viewing life as a laboratory, as an opportunity to examine ourselves and our world, using working hypotheses rather than doctrines. (shrink)

Since we cannot put stars in a laboratory, astrophysicists had to wait till the invention of computers before becoming laboratory scientists. For half a century now, we have been conducting experiments in our virtual laboratories. However, we ourselves have remained behind the keyboard, with the screen of the monitor separating us from the world we are simulating. Recently, 3D on-line technology, developed first for games but now deployed in virtual worlds like Second Life, is beginning to make it possible for (...) astrophysicists to enter their virtual labs themselves, in virtual form as avatars. This has several advantages, from new possibilities to explore the results of the simulations to a shared presence in a virtual lab with remote collaborators on different continents. I will report my experiences with the use of Qwaq Forums, a virtual world developed by a new company. (shrink)

The book argues that mainstream economists, who base their analyses only on the economic motivation of people, fail to explain and understand real-life economic phenomena. The economic crisis, which began in 2008, illustrates the relevance of psychic and social motivations, especially when combined with each other. This book discusses orthodox and heterodox economics, and offers the reader ample material on philosophy of science, psychology and sociology. A multidisciplinary economic perspective is constructed in which economics, psychology, and sociology are integrated, and (...) this multidisciplinary approach offers an understanding of real-life problems. Moreover, it offers researchers a rich source for further analysis. (shrink)

The article represents auto-ethnographical reflections about the author's journey towards reconciling diversity with the advent of democracy in South Africa. The author recounts aspects of his participation in the Truth and Reconciliation Commission. It focuses on aspects of Reformed theology and spirituality as instruments for reconciling diversity. Local and international theologians opposed apartheid, calling it an unjust and indefensible political system, using their Reformed conviction, often applying the very same notions and principles. The article discusses the opposition to apartheid in (...) the Reformed world, which culminated during the Ottawa meeting of the World Alliance of Reformed Churches in 1982 when apartheid was denounced as a 'sin and a heresy' - a legitimate cause for a Status Confessionisin a classical Reformed manner. The article demonstrates the way in which the TRC took note of all of this and includes testimonies of Reformed theologians and leaders who opposed apartheid, often paying a costly price. (shrink)

This article starts with a brief statement on the well-known contradictory nature of the Reformed tradition in South Africa, defending injustice and struggling for justice in the name of the same tradition. By following the work of Reformed systematic theologian D.J. Smit, it argues that the justice-affirming potential of the Reformed tradition is a hermeneutical task built on three specific re-interpretations: the reinterpretation of Scripture from the perspective of the weak, the poor and the oppressed a rereading of John Calvin (...) to affirm the dignity and freedom of all humans a rereading of Karl Barth with a focus on God's inclusive grace, Christian confessions and the nature of the Christian life. The article closes with a brief look into the agenda for social transformation faced by us in the second decade of the 21st century, and under what conditions the Reformed faith will be able to make an enduring contribution to public life in Africa. (shrink)

After the presentation of different views on the relation between narrative and life it is argued that Paul Ricoeur's view offers a framework that allows an answer to questions that remain unanswered in the work of MacIntyre and Carr. Although Ricoeur's view has its own flaws, the concepts of triple mimesis and of narrative identity can be incorporated in a post-foundationalist view. Within this resulting frame of reference narratives in narrative research are interpreted as compositions, as the result of emplotment. (...) Thus the characteristics of a narrative apply to the participant's stories, to personal identity and to the researcher's narrative. (shrink)

Is it really true that there is an underlying unity, that we and our worlds are all part of a single web of existence, a web which allows a myriad relative differences while retaining the same absolute oneness? If not, how so — where can we find the absolute differences which preclude an underlying unity? But if it is true, what is the meaning of this oneness — and what can we do with it?

Exploring the unknown is a task that scientists and mystics alike have set themselves, although starting off in rather different directions. At first, these tasks were seen to be sufficiently different, so that they did not crowd each other. But by now scientific insight has grown to such an extent that there seems to be less and less room for mystic explorations. Simply said: there seems to be little left of an unknown to jump into, in order to find a (...) deeper grounding for our fleeting world of experience, through direct contact with reality, call it mystic, spiritual, or contemplative. Will the objective approach of science have the last word, and tell us how our experiences, from the every-day to the deeply spiritual, can seen as simple consequences of complex electrochemical phenomena in the brain? Or will further progress bring about a modification of both scientific and contemplative approaches, perhaps introducing a form of science of the subject, together with a heightened appreciation of the limits of the describable, even in a world of objects? In order to address those questions, what we need are stepping stones to connect the bodies of knowledge that have been acquired in different traditions. A systematic way to return to the phenomena themselves may provide such a stepping stone. Already familiar in science, philosophy, and personal paths of explorations, but under rather different names, such a phenomenology may help the different sides to reach each other. (shrink)

When I got my first camera, I noticed something very interesting. After an intensive period of picture taking, the streets of my familiar small town had somehow landed in a different world. I saw everything in a different light. More accurately, I saw the world as light, rather than as matter. My attention had shifted, first rather innocently from seeing a lit-up building to seeing a lit-up building. Then the shift deepened, from seeing a building that was lit-up by the (...) sunlight to seeing the light itself, that happened to carry the imprint of a lit-up building. (shrink)