Though the Christian faith has in recent years increasingly shown itself to be a truly African religion, a variety of African authors such as Kä Mana, George Kinoti, Hannah Kinoti, August Shutte and Efoé Julien Penoukou have noted that sub-Saharan Africa is facing a moral crisis. This article explores this crisis in as far as it is caused by difficulties in the reception of the Christian ethic by African Christian communities. It points out that this crisis is visible in double (...) morality, immorality and legalism. It shows that it is both caused by rapid social change in contemporary Africa and by the way the Christian ethic was introduced with a lack of attention for the relationship between worldview and ethics, the social impact of changing cultural practices and the importance of virtue ethics. In this way it also points to the shape Christian moral education for present-day Africa should take. (shrink)

In the post-colonial era, the incarnation has become an important model for cross-cultural missionary presence. Though this model improves on Eurocentric and colonial models, it is deficient because it is unrealistic, potentially paternalistic, inappropriate in the light of globalization and post-modern understandings of culture, and because it doesn’t sufficiently respect the particularity of the incarnation of Christ. This article proposes an alternative model of the role of the cross-cultural missionary as a guest and argues that it is more appropriate on (...) precisely these counts. (shrink)

The science and faith debate is dominated by Western voices. In order to enrich this debate, the authors study the discourses of different groups of Christian academics and master's students in francophone Africa. This article describes the process of reconstructing and analyzing the discourse of a group of master's students from Abidjan (Ivory Coast) with the help of group model building and focus groups. Three characteristic features that emerge from this discourse include the foundational position of faith, the central role (...) of truth, and the ambiguous connotations of the term “science” in this context. The reconstructed discourse is then brought into conversation with the North Atlantic debate, with a special focus on the concept of scientism. (shrink)

Awareness, care and preventative action regarding HIV/aids, and those affected by it, is growing in the evangelical Christian Community in French-speaking Sub-Saharan Africa. Yet, even though the issues seem to be addressed through teaching and preaching in the churches, the real issues, questions and struggles of the people are not discussed. This article describes some of the most important outcomes of a qualitative research in this people group, looking at the values and beliefs around sexuality and community and what impact (...) they have on current HIV/aids prevention practices and strategies. This description highlights the seeming discrepancy between people’s values and their daily lives, the role community can play – as both a community of grace and a countercultural yet contextually relevant community, and the role of leaders, grass-root communities and partnership processes in strategy development. This article argues for a contextual relevant approach in which the specific evangelical worldview is encountered as a possible strength, rather than a problem. (shrink)

The paper uses the formalism of indexed categories to recover the proof of a standard final coalgebra theorem, thus showing existence of final coalgebras for a special class of functors on finitely complete and cocomplete categories. As an instance of this result, we build the final coalgebra for the powerclass functor, in the context of a Heyting pretopos with a class of small maps. This is then proved to provide models for various non-well-founded set theories, depending on the chosen axiomatisation (...) for the class of small maps. (shrink)

We introduce constructive and classical systems for nonstandard arithmetic and show how variants of the functional interpretations due to Gödel and Shoenfield can be used to rewrite proofs performed in these systems into standard ones. These functional interpretations show in particular that our nonstandard systems are conservative extensions of E-HAω and E-PAω, strengthening earlier results by Moerdijk and Palmgren, and Avigad and Helzner. We will also indicate how our rewriting algorithm can be used for term extraction purposes. To conclude the (...) paper, we will point out some open problems and directions for future research, including some initial results on saturation principles. (shrink)

This is the first in a series of papers on Predicative Algebraic Set Theory, where we lay the necessary groundwork for the subsequent parts, one on realizability [B. van den Berg, I. Moerdijk, Aspects of predicative algebraic set theory II: Realizability, Theoret. Comput. Sci. . Available from: arXiv:0801.2305, 2008], and the other on sheaves [B. van den Berg, I. Moerdijk, Aspects of predicative algebraic set theory III: Sheaf models, 2008 ]. We introduce the notion of a predicative category with small (...) maps and show that it provides a sound and complete semantics for constructive set theories like IZF and CZF. The main technical contribution of this paper is that it shows in detail that such categories can always be conservatively embedded in categories that are exact. These exactness properties play a crucial rôle in showing that predicative categories with small maps contain models of set theory and that they are closed under sheaves and realizability. We will prove the former statement in this paper as well, leaving a proof of the closure properties to the papers on realizability and sheaves as mentioned above. (shrink)

Using the theory of exact completions, I construct a certain class of pretoposes, consisting of what one might call “predicative realizability toposes”, that can act as categorical models of certain predicative type theories, including Martin-Löf Type Theory.

A nucleus is an operation on the collection of truth values which, like double negation in intuitionistic logic, is monotone, inflationary, idempotent and commutes with conjunction. Any nucleus determines a proof-theoretic translation of intuitionistic logic into itself by applying it to atomic formulas, disjunctions and existentially quantified subformulas, as in the Gödel–Gentzen negative translation. Here we show that there exists a similar translation of intuitionistic logic into itself which is more in the spirit of Kuroda’s negative translation. The key is (...) to apply the nucleus not only to the entire formula and universally quantified subformulas, but to conclusions of implications as well. (shrink)

We study a new proof principle in the context of constructive Zermelo-Fraenkel set theory based on what we will call “non-deterministic inductive definitions”. We give applications to formal topology as well as a predicative justification of this principle.

Non-well-founded trees are used in mathematics and computer science, for modelling non-well-founded sets, as well as non-terminating processes or infinite data structures. Categorically, they arise as final coalgebras for polynomial endofunctors, which we call M-types. We derive existence results for M-types in locally cartesian closed pretoposes with a natural numbers object, using their internal logic. These are then used to prove stability of such categories with M-types under various topos-theoretic constructions; namely, slicing, formation of coalgebras , and sheaves for an (...) internal site. (shrink)

We propose an extension of Aczel's constructive set theory CZF by an axiom for inductive types and a choice principle, and show that this extension has the following properties: it is interpretable in Martin-Löf's type theory. In addition, it is strong enough to prove the Set Compactness theorem and the results in formal topology which make use of this theorem. Moreover, it is stable under the standard constructions from algebraic set theory, namely exact completion, realizability models, forcing as well as (...) more general sheaf extensions. As a result, methods from our earlier work can be applied to show that this extension satisfies various derived rules, such as a derived compactness rule for Cantor space and a derived continuity rule for Baire space. Finally, we show that this extension is robust in the sense that it is also reflected by the model constructions from algebraic set theory just mentioned. (shrink)

We present a version of arithmetic in all finite types based on a systematic use of an internally definable notion of observational equivalence for dealing with equalities at higher types. For this system both intensional and extensional models are possible, the deduction theorem holds and the soundness of the Dialectica interpretation is provable inside the system itself.

In earlier work we introduced two systems for nonstandard analysis, one based on classical and one based on intuitionistic logic; these systems were conservative extensions of first-order Peano and Heyting arithmetic, respectively. In this paper we study how adding the principle of countable saturation to these systems affects their proof-theoretic strength. We will show that adding countable saturation to our intuitionistic system does not increase its proof-theoretic strength, while adding it to the classical system increases the strength from first- to (...) full second-order arithmetic. (shrink)

We show that Martin Hyland's effective topos can be exhibited as the homotopy category of a path category EFF. Path categories are categories of fibrant objects in the sense of Brown satisfying two additional properties and as such provide a context in which one can interpret many notions from homotopy theory and Homotopy Type Theory. Within the path category EFF one can identify a class of discrete fibrations which is closed under push forward along arbitrary fibrations (in other words, this (...) class is polymorphic or closed under impredicative quantification) and satisfies propositional resizing. This class does not have a univalent representation, but if one restricts to those discrete fibrations whose fibres are propositions in the sense of Homotopy Type Theory, then it does. This means that, modulo the usual coherence problems, it can be seen as a model of the Calculus of Constructions with a univalent type of propositions. We will also build a more complicated path category in which the class of discrete fibrations whose fibres are sets in the sense of Homotopy Type Theory has a univalent representation, which means that this will be a model of the Calculus of Constructions with a univalent type of sets. (shrink)

Recently, the second author, Briseid, and Safarik introduced nonstandard Dialectica, a functional interpretation capable of eliminating instances of familiar principles of nonstandard arithmetic—including overspill, underspill, and generalizations to higher types—from proofs. We show that the properties of this interpretation are mirrored by first-order logic in a constructive sheaf model of nonstandard arithmetic due to Moerdijk, later developed by Palmgren, and draw some new connections between nonstandard principles and principles that are rejected by strict constructivism. Furthermore, we introduce a variant of (...) the Diller–Nahm interpretation with two different kinds of quantifiers, similar to Hernest’s light Dialectica interpretation, and show that one can obtain nonstandard Dialectica by weakening the computational content of the existential quantifiers—a process called herbrandization. We also define a constructive sheaf model mirroring this new functional interpretation, and show that the process of herbrandization has a clear meaning in terms of these sheaf models. (shrink)

Het ethos waarin de mens leeft en handelt is in verandering zolang de mens leeft en handelt. In De maakbare moraal reflecteren verschillende filosofen over de antwoorden die het moderne en hedendaagse denken kunnen bieden op vragen die net door dat veranderend ethos tot stand worden gebracht. De idee dat moraal 'maakbaar' zou zijn houdt meteen ook een kritisch standpunt in: wat precies is er in onze morele omgang met elkaar dat beheersbaar, expliciteerbaar, voorstelbaar... zou kunnen zijn? De maakbare moraal (...) bundelt bijdragen van Daniel Acke, Hans Alma, Sonja Lavaert, Julia Maria Mönig, Johan Stuy en Adelheid Rigo, Marc Van den Bossche, Yoni Van Den Eede, Karl Verstrynge en Else Walravens. De reeks Humanismen wil het denken over de hedendaagse condition humaine op een prikkelende en eigenzinnige manier stimuleren. Het begrip humanisme krijgt hier een zeer ruime omschrijving: respect voor de mens in zijn diversiteit en pluraliteit en voor de manier waarop individuen zoeken naar identiteit en zingeving. De reeks komt tot stand onder begeleiding van prof. dr. Marc Van den Bossche van de vakgroep Wijsbegeerte en Moraalwetenschappen van de Vrije Universiteit Brussel. (shrink)

In this interview with Jan Hendrik van den Berg, the Dutch phenomenologist and psychiatrist addresses the origins of his work, his most significant influences, and the purpose of metabletic phenomenology in the modern age. In the course of the interview. Dr. Van den Berg provides a basic overview of his work, and highlights the central finding of his metabletic analyses: a loss of wonder before nature, which results from the more fundamental loss of genuine spirituality in the modern world.

Introduction to collection of papers by group of scholars and ACO missionaries brought together to discuss the developments within the ACO over the past hundred years during a conference that was organised by Dr Wilbert van Saane of Haigazian University in January 2021. I will briefly summarise what strikes me as characteristic of the ACO on the basis of these articles, and conclude with a discussion of how this may contribute to further reflection in Mission Studies and World Christianity.

De redactie van Philosophia Reformata heeft aan prof. Brümmer, dr. Sarot en ondergetekende gevraagd te reageren op hetgeen prof. Geertsema in twee bijdragen aan dit nummer over de zogenoemde ‘Utrechtse school’ in de wijsgerige theologie te berde brengt. Aangezien het minder gebruikelijk is om als auteurs c.q. redacteuren te reageren op een boekrecensie, gaan onze duplieken vooral in op het zelfstandige artikel dat Geertsema wijdt aan de theologie van Brümmer. Toch willen we graag ook beknopt reageren op de recensie, die (...) immers de vorm gekregen heeft van een tamelijk uitvoerige ‘kritische studie’, en daarmee toch eigenlijk ook van een min of meer zelfstandige bijdrage. (shrink)

This article contributed to a project about Nature and Theology (Prof. Dr. J. Buitendag). The text questioned why our modern concept of nature must be reformulated in a contemporary concept of nature as the anthropocentrism of the modern concept of nature is criticised by a growing knowledge about the cohesion of many phenomena in the evolution of life on planet Earth. This criticism confronts theologians with fundamental deficiencies in their ongoing anthropological approach of life, especially human life. The article looked (...) for a reinterpretation of mystical texts of Gregory of Nyssa in order to question whether this offers a new framework of a theological approach of a contemporary concept of nature. Contribution: Within the project about Nature and Theology new questions arise as the concept of Nature has to be reformulated based on new insights in the evolution of life. Within the debates about the Anthropocene, the planet Earth is approached as being a living reality in one way or another. So theologians have to look for new theological approaches as well. This article suggested that concepts of Gregory of Nyssa contribute in this respect. (shrink)

Classical apologetic strategies are in dire straits, according to some experts, particularly in a postmodern, post-Western, post-Enlightenment, and post-Christian world. Benno van den Toren confronts these questions head-on while proposing a methodologically sophisticated and theologically robust rationale for a dialogically oriented Christian apologetics. Christian Apologetics as Cross-Cultural Dialogue invites conversation about epistemological, dialogical, ecclesiological, eschatological, and christological matters, all of which suggest that a new paradigm of apologetics may be on the horizon for evangelical philosophy and theology. Those (...) who disagree will need to make their case against the arguments in this book. (shrink)

Die prospektive Analyse der ethischen Implikationen medizinisch-technischer Innovationen läuft immer auch Gefahr, sich in den Wunschbildern von Marketingexperten zu verfangen. Vor diesem Hintergrund könnte es durchaus nützlich sein, die Erkenntnisse der Wissenschafts- und Technikforschung zur Genese und Entwicklung neuer Techniken auszuschöpfen. Dies erscheint gerade auch für die ins Phantastische weisende Zukunft der Individualisierung medikamentöser Therapie, wie man ihr häufig in der Beschreibung pharmakogenetischer Behandlungskonzepte begegnet, angebracht. Techniken, die sich noch im Entwicklungsstadium befinden und deren breite Anwendung noch einige Jahre auf (...) sich warten lassen wird, sollten sehr sorgfältig auf ihren Realitätsgehalt und das zu erwartende Leistungspotenzial hin analysiert werden. Dazu gehört v. a. auch eine kritische Auseinandersetzung mit den Leitbildern, Visionen und Nutzenversprechen, mit denen technische Innovationen oft sehr absichtsvoll ausgestattet werden. Wird dabei die Distanz zur Rhetorik der Protagonisten der neuen Techniken nicht gewahrt, gerät die ethische Reflexion unvermittelt in die Rolle, profane Marketingstrategien wortgewandt und ideenreich zu veredeln. (shrink)

Politicians and engineers are increasingly realizing that values are important in the development of technological artefacts. What is often overlooked is that different conceptualizations of these abstract values lead to different design-requirements. For example, designing social media platforms for deliberative democracy sets us up for technical work on completely different types of architectures and mechanisms than designing for so-called liquid or direct forms of democracy. Thinking about Democracy is not enough, we need to design for the proper conceptualization of these (...) values. As we see it, we cannot responsibly engineer and innovate and shape technology in accordance with our moral values without engaging in systematic and continuous conceptual engineering: This is not only an academic, or theoretical issue, it is also not simply an issue for public policy or politics, or regulators, it has become a central problem for engineering and the world of technology. In this paper, we present a framework for doing the necessary conceptual work in the context of requirement engineering. We draw on the literature on conceptual engineering to lay out a methodology to (1) assess different conceptions and (2) to develop new conceptions. Moreover, we integrate this methodology with extant approaches in the philosophy of technology which aim at designing technological artefacts ethically. In the final section we apply this integrated framework to freedom in the context of social media networks. (shrink)

Flow is a gratifying state of deep involvement and absorption that individuals report when facing a challenging activity and they perceive adequate abilities to cope with it. The flow concept was introduced by Csikszentmihalyi in 1975, and interest in flow research is growing. However, to our best knowledge, no scoping review exists that takes a systematic look at studies on flow which were published between the years 2000 and 2016. Overall, 252 studies have been included in this review. Our review (...) provides a framework to cluster flow research, gives a systematic overview about existing studies and their findings, and provides an overview about implications for future research. The provided framework consists of three levels of flow research. In the first “Individual” level are the categories for personality, motivation, physiology, emotion, cognition, and behavior. The second “Contextual” level contains the categories for contextual and interindividual factors and the third “Cultural” level contains cultural factors that relate to flow. Using our framework, we systematically present the findings for each category. While flow research has made progress in understanding flow, in the future, more experimental and longitudinal studies are needed to gain deeper insights into the causal structure of flow and its antecedents and consequences. (shrink)

The American Journal of Bioethics, Volume 12, Issue 2, Page 16-17, February 2012.

Libertarian paternalism involves the idea that it is justified to shape the context in which people make important choices in a way that they are nudged to options that would be better for them, wh...

Several authors have pointed at opportunities to develop the well-established Business Balanced Scorecard into a Scorecard that enables companies to integrate sustainability into their strategy. Recent case studies and research experiences show that social and environmental targets are more widely recognized as strategic drivers for management. However, experiments also show that the traditional Scorecard has its limits when it comes to e.g. stakeholder management and product chain management. The European Corporate Sustainability Framework(ECSF) program distinguishes several ambition levels for Corporate Sustainability/corporate (...) Responsibility. The traditional Balanced Scorecard is suitable for companies that aim for Compliance-driven CS/cror for Profit-driven CS/cr, where the financial bottom line is the ultimate indicator for success. More ambitious companies want to balance economic, social and ecological targets in a Community-driven CS/sror Synergy-driven CS/cr.For ambitious companies, we propose a format of a Responsive Business Scorecard (RBS). The Responsive Scorecard enables companies to score at Profit, People and Planet, at the same time to integrate stakeholder demands into internal programs to improve performance. The RBS includes five Perspectives: Customers&Suppliers, Financiers&Owners, Society&Planet, Internal Process and Employees&Learning.We assessed the practical feasibility of a Responsive Scorecardin food and tourist industries. In the food industry, we analyzed whether existing business priorities of Italian companies can adequately fill a Responsive scorecard.Our conclusion is that traditional topics like finance, customers and employees are readily filled, but that sustainability topics like chain management (suppliers) and environmental performance (planet) need further elaboration. The tourist sector is dominated by Small and Medium Sized Enterprises. We investigated whether existing eco-labels for camping-sites and marinas can be developed into Responsive Scorecards. Our conclusion is that such a sector specific development of a Responsive Scorecard is possible. Further research has to show what is the value added of the new scorecard for companies in the tourist sector. (shrink)

Over recent decades, developments in network governance have seen governments around the world cede considerable authority and responsibility to commercial migration intermediaries for recruiting and managing temporary migrant labour. Correspondingly, a by-product of network governance has been the emergence of soft employment regulation in which voluntary codes of conduct supplement hard legal employment standards. This paper explores these developments in the context of temporary migrant workers employed in Australian horticulture. First the paper analyses the growing use of temporary migrant labour (...) in this industry. It then describes how different types of intermediaries interact with this workforce. The paper then outlines both hard and soft employment regulations, and contrasts them with actual employment conditions, questioning how a network governance approach has affected this vulnerable workforce. The paper concludes that changes in network governance of migration and employment relations have emasculated formal legal regulation, leaving market forces to operate without effective or ethical constraints at the expense of the public good. (shrink)

Surveys carried out among palliative care physicians have shown that most participants do not support euthanasia and assisted suicide. Belgium, however, is one of the few countries in the world in which voluntary euthanasia is allowed by law. The potential influence of this legal dimension thus warranted a study of the attitudes of Belgian palliative care physicians toward euthanasia and assisted suicide. To this end, an anonymous self-administered questionnaire in Dutch was sent to all physicians working in Flemish palliative care. (...) 99 physicians responded .A majority of the physicians who responded are of the opinion that voluntary euthanasia can be ethically justified . Most physicians believe, nonetheless, that non-voluntary euthanasia is always unethical . More than three quarters of the respondents favour the inclusion of a ‘palliative filter’ in the law on euthanasia. Using a traditional cluster algorithm, the following three clusters were obtained: staunch advocates of euthanasia , opponents of euthanasia , and an intermediate group . There were no significant differences between the clusters on the level of gender, age, and years of experience in palliative care. A statistically significant association exists, however, between the euthanasia clusters and the religious or ideological clusters we had obtained in an earlier study. Church attending respondents are least likely to be staunch advocates of euthanasia. The majority of the physicians favour legalisation on assisted suicide. There is no significant association between the euthanasia clusters and attitudes toward assisted suicide.We conclude that although most Flemish palliative care physicians agree that there may be circumstances in which a euthanasia request is justified, they also strongly believe in the effects of good palliative care and want the ‘palliative filter’ to be included in the law on euthanasia. Religion and worldview are an important factor determining attitudes towards euthanasia. (shrink)

The development of ever smaller integrated circuits at the sub-micron and nanoscale—in accordance with Moore’s Law—drives the production of very small tags, smart cards, smart labels and sensors. Nanoelectronics and submicron technology supports surveillance technology which is practically invisible. I argue that one of the most urgent and immediate concerns associated with nanotechnology is privacy. Computing in the twenty-first century will not only be pervasive and ubiquitous, but also inconspicuous. If these features are not counteracted in design, they will facilitate (...) ubiquitous surveillance practices which are widely available, cheap, and intrusive. RFID technology is an instructive example of what nanotechnology has in store for privacy. (shrink)

The Shapley value is the unique value defined on the class of cooperative games in characteristic function form which satisfies certain intuitively reasonable axioms. Alternatively, the Banzhaf value is the unique value satisfying a different set of axioms. The main drawback of the latter value is that it does not satisfy the efficiency axiom, so that the sum of the values assigned to the players does not need to be equal to the worth of the grand coalition. By definition, the (...) normalized Banzhaf value satisfies the efficiency axiom, but not the usual axiom of additivity. (shrink)