The meaning of sustainability is the subject of intense debate among environmental and resource economists. Perhaps no other issue separates more clearly the traditional economic view from the views of most natural scientists. The debate currently focuses on the substitutability between the economy and the environment or between “natural capital” and “manufactured capital”—a debate captured in terms of weak versus strong sustainability. In this article, we examine the various interpretations of these concepts. We conclude that natural science (...) and economic perspectives on sustainability are inconsistent. The market-based Hartwick-Solow “weak sustainability” approach is far removed from both the ecosystem-based “Holling sustainability” and the “strong sustainability” approach of Daly and others. Each of these sustainability criteria implies a specific valuation approach, and thus an ethical position, to support monetary indicators of sustainability such as a green or sustainable Gross Domestic Product. The conflict between “weak sustainability” and “strong sustainability” is more evident in the context of centralized than decentralized decision making. In particular, firms selling “services” instead of material goods and regarding the latter as “capital” leads to decisions more or less consistent with either type of sustainability. Finally, we discuss the implications of global sustainability for such open systems as regions and countries. Open systems have not been dealt with systematically for any of the sustainability criteria. (shrink)

The meaning of sustainability is the subject of intense debate among environmental and resource economists. Perhaps no other issue separates more clearly the traditional economic view from the views of most natural scientists. The debate currently focuses on the substitutability between the economy and the environment or between “natural capital” and “manufactured capital”—a debate captured in terms of weak versus strong sustainability. In this article, we examine the various interpretations of these concepts. We conclude that natural science (...) and economic perspectives on sustainability are inconsistent. The market-based Hartwick-Solow “weak sustainability” approach is far removed from both the ecosystem-based “Holling sustainability” and the “strong sustainability” approach of Daly and others. Each of these sustainability criteria implies a specific valuation approach, and thus an ethical position, to support monetary indicators of sustainability such as a green or sustainable Gross Domestic Product (GDP). The conflict between “weak sustainability” and “strong sustainability” is more evident in the context of centralized than decentralized decision making. In particular, firms selling “services” instead of material goods and regarding the latter as “capital” leads to decisions more or less consistent with either type of sustainability. Finally, we discuss the implications of global sustainability for such open systems as regions and countries. Open systems have not been dealt with systematically for any of the sustainability criteria. (shrink)

This chapter focuses on the issue of methodological usefulness of a strong versus weak adaptationist position in attempting to gain significant insight and to make scientifically important advances and discoveries in human cognition. Strong adaptationism holds that complex design is best explained by task-specific adaptations to particular ancestral environments; whereas weak adaptationism claims that we should not assume that complex design is the result of such narrowly determined task- or niche-specific evolutionary pressures in the absence (...) of substantial corroborating evidence. It argues that in cases of certain domain-specific cognitive competencies strong adaptationism has proven useful but not necessary to recent progress in the field. In other cases, a weak adaptationist strategy has been arguably most productive in advancing scientific understanding, without precluding that the structures uncovered by other means are actually adaptations. (shrink)

This paper is a study of similarities and differences between strong and weak quantum consequence operations determined by a given class of ortholattices. We prove that the only strong orthologics which admits the deduction theorem (the only strong orthologics with algebraic semantics, the only equivalential strong orthologics, respectively) is the classical logic.

ArgumentIn the theory-dominated view of scientific experimentation, all relations of theory and experiment are taken on a par; namely, that experiments are performed solely to ascertain the conclusions of scientific theories. As a result, different aspects of experimentation and of the relations of theory to experiment remain undifferentiated. This in turn fosters a notion of theory-ladenness of experimentation (TLE) that is toocoarse-grainedto accurately describe the relations of theory and experiment in scientific practice. By contrast, in this article, I suggest that (...) TLE should be understood as anumbrella conceptthat has different senses. To this end, I introduce a three-fold distinction among the theories of high-energy particle physics (HEP) as background theories, model theories, and phenomenological models. Drawing on this categorization, I contrast two types of experimentation, namely, “theory-driven” and “exploratory” experiments, and I distinguish between the “weak” and “strong” senses of TLE in the context of scattering experiments from the history of HEP. This distinction enables identifying the exploratory character of the deep-inelastic electron-proton scattering experiments – performed at the Stanford Linear Accelerator Center (SLAC) between the years 1967 and 1973 – thereby shedding light on a crucial phase of the history of HEP, namely, the discovery of “scaling,” which was the decisive step towards the construction of quantum chromo-dynamics as a gauge theory of strong interactions. (shrink)

In the theory-dominated view of scientific experimentation, all relations of theory and experiment are taken on a par; namely, that experiments are performed solely to ascertain the conclusions of scientific theories. As a result, different aspects of experimentation and of the relation of theory to experiment remain undifferentiated. This in turn fosters a notion of theory-ladenness of experimentation that is too coarse-grained to accurately describe the relations of theory and experiment in scientific practice. By contrast, in this article, I suggest (...) that TLE should be understood as an umbrella concept that has different senses. To this end, I introduce a three-fold distinction among the theories of high-energy particle physics as background theories, model theories and phenomenological models. Drawing on this categorization, I contrast two types of experimentation, namely, “theory-driven” and “exploratory” experiments, and I distinguish between the “weak” and “strong” senses of TLE in the context of scattering experiments from the history of HEP. This distinction enables to identify the exploratory character of the deep-inelastic electron-proton scattering experiments—performed at the Stanford Linear Accelerator Center between the years 1967 and 1973—thereby shedding light on a crucial phase of the history of HEP, namely, the discovery of “scaling”, which was the decisive step towards the construction of quantum chromo-dynamics as a gauge theory of strong interactions. (shrink)

In this paper it is shown how plausible reasoning of the kind illustrated in the ancient Greek example of the weak and strong man can be analyzed and evaluated using a procedure in which the pro evidence is weighed against the con evidence using formal, computational argumentation tools. It is shown by means of this famous example how plausible reasoning is based on an audience’s recognition of situations of a type they are familiar with as normal and comprehensible (...) in their shared common knowledge. The paper extends previous work on this example by using three new multiagent argumentation schemes closely related to the scheme for argument from negative consequences. (shrink)

Strong predictivism, the idea that novel predictions per se confirm theories more than accommodations, is based on a “no miracle” argument from novel predictions to the truth of theories (NMAT). Eric Barnes rejects both: he reconstructs the NMAT as seeking an explanation for the entailment relation between a theory and its novel consequences, and argues that it involves a fallacious application of Occam’s razor. However, he accepts a no miracle argument for the truth of background beliefs (NMABB): scientists endorsed (...) a successful theory because they were guided by largely true background beliefs. This in turn raises the probability that the theory is true; so Barnes embraces a form of weak predictivism, according to which predictions are only indirectly relevant to confirmation. To Barnes I reply that we should also explain how the successful theory was constructed, not just endorsed; background beliefs are not enough to explain success, scientific method must also be considered; Barnes can account for some measure of confirmation of our theories, but not for the practical certainty conferred to them by some astonishing predictions; true background beliefs and reliability by themselves cannot explain novel success, the truth of theories is also required. Hence, the NMAT is sound, and strong predictivism is right. In fact, Barnes misinterprets the NMAT, which does not involve Occam’s razor, takes as explanandum the building of a theory which turned out to predict surprising facts, and successfully concludes that the theory is true. This accounts for the practically certain confirmation of our most successful theories, in accordance with strong predictivism. (shrink)

The war on terrorism, say America's leaders, is a war of Good versus Evil. But in the minds of the perpetrators, the September 11 attacks on New York and Washington were presumably justified as ethically good acts against American evil. Is such polarization leading to a violent "clash of civilizations" or can differences between ethical systems be reconciled through rational dialogue? This book provides an extraordinary resource for thinking clearly about the diverse ways in which humans see good and (...) evil. In nine essays and responses, leading thinkers ask how ethical pluralism can be understood by classical liberalism, liberal-egalitarianism, critical theory, feminism, natural law, Confucianism, Islam, Judaism, and Christianity. Each essay addresses five questions: Is the ideal society ethically uniform or diverse? Should the state protect, ban, or otherwise intervene in ethically based differences? How should disagreements on the rights and duties of citizens be dealt with? Should the state regulate life-and-death decisions such as euthanasia? To what extent should conflicting views on sexual relationships be accommodated? This book shows that contentious questions can be discussed with both incisiveness and civility. The editors provide the introduction and Donald Moon, the conclusion. The contributors are Brian Barry, Joseph Boyle, Simone Chambers, Joseph Chan, Christine Di Stefano, Dale F. Eickelman, Menachem Fisch, William Galston, John Haldane, Chandran Kukathas, David Little, Muhammad Khalid Masud, Carole Pateman, William F. Scheuerman, Adam B. Seligman, James W. Skillen, James Tully, and Lee H. Yearley. (shrink)

M. Gams et al. (Eds.) IOS Press, "Strong AI": an Adolescent Disorder Donald Michie Professor Emeritus, University of Edinburgh, UK Associate ...

In three experiments, we investigated the computational complexity of German reciprocal sentences with different quantificational antecedents. Building upon the tractable cognition thesis (van Rooij, 2008) and its application to the verification of quantifiers (Szymanik, 2010) we predicted complexity differences among these sentences. Reciprocals with all-antecedents are expected to preferably receive a strong interpretation (Dalrymple et al., 1998), but reciprocals with proportional or numerical quantifier antecedents should be interpreted weakly. Experiment 1, where participants completed pictures according to their preferred interpretation, (...) provides evidence for these predictions. Experiment 2 was a picture verification task. The results show that the strong interpretation was in fact possible for tractable all but one-reciprocals, but not for exactly n. The last experiment manipulated monotonicity of the quantifier antecedents. (shrink)

This paper analyses the role of external pressures, internal motivations and their interplay, with the intention of identifying whether they drive substantive or instead symbolic implementation of ISO 14001. The context is one of economic crisis. We focus on Greece, where the economic crisis has weakened the country’s institutional environment, and analyse qualitatively new interview data from 45 ISO 14001 certified firms. Our findings show that weak external pressures can lead to a symbolic implementation of ISO 14001, as firms (...) can defend their legitimacy without incurring the costs of internalization in the local market; weak external pressures can lead to substantive implementation of ISO 14001 when firms have strong internal motivations seeking to strategically differentiate from competitors in international markets. Firms internalize ISO 14001 so as to restore their legitimacy and reputation in foreign markets and stimulate their competitiveness; and strong internal motivations pave the way for companies to stimulate their competitiveness by enhancing their efficiency, as some companies might strengthen their position in the local market by implementing ISO 14001 substantively. The contribution of this paper to the literature on ISO 14001 internalization lies in refining existing theory on the importance of internal motivations for the substantive implementation of ISO 14001 in the context of economic crisis. In addition, this paper extends current theory by challenging studies that dismiss the importance of external pressures. We argue that the intensity of external pressures influences the internalization of ISO 14001, but propose that this relationship might not be linear. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Folk Taxonomies Versus Official TaxonomiesNick Haslam (bio)Keywordsclassification, DSM-IV, folk taxonomyFlanagan and Blashfield’s paper continues a highly original program of research on clinicians’ understandings of psychopathology. This work is unique in bringing concepts and methods from cognitive anthropology to bear on psychiatric classification. At first blush, it might seem questionable to treat clinicians’ beliefs about psychiatric disorders as folk taxonomies, no different in kind from classifications of birds produced (...) by members of a forest-dwelling tribe. Unlike birds and other natural objects of folk taxonomies, mental disorders are not concrete entities and they cannot be distinguished on perceptual grounds. Unlike tribespeople, clinicians are not simply “folk” whose naïve classifications can be compared with those of scientific authorities. They are, in fact, heavily exposed to the reigning official taxonomy during their professional training, and their thinking can hardly remain unaffected by it. It is a testament to Flanagan and Blashfield’s work that despite these apparent disanalogies, their folk-taxonomic approach manages to illuminate how clinicians carve up the psychiatric domain.This paper reports some careful, creative, and labor-intensive studies to make a few fundamental claims about how clinicians classify. First, the authors argue that clinicians hold simplified taxonomies compared with the official DSM-IV taxonomy: They encompass fewer disorders and classify them in a shallower hierarchy. Second, they claim that clinicians substantially agree in how they classify disorders, and that a consensus classification can therefore be extracted from their individual taxonomies. Third, they argue that clinicians’ taxonomies show only a modest consistency with DSM-IV, and that the discrepancies may be systematic and important. Notably, for example, clinicians did not preserve the fundamental divide between the DSM’s Axes I and II. My comments address the second and third claims.Is There a “Consensus” among the Clinicians?One of the main achievements of Flanagan and Blashfield’s paper is to develop a “consensual taxonomy,” which is laid out in their Table 2a. This taxonomy clearly distils how their clinicians tended to judge the relations among diagnoses. However, it is an exaggeration to present it as a consensus. If, by Romney, Weller, and Batchelder’s (1986) third criterion, “cultural consensus” requires that the primary factor in a principal components analysis accounts for “most” of the variance in clinicians’ judgments, then Flanagan and Blashfield’s analysis [End Page 281] fails to show consensus. Their first factor accounts for only twenty-five percent of the variance, well short of the required majority. This finding implies that there is three times as much inconsistency or variability among clinicians’ taxonomic judgments than there is consistency and commonality. The observed factor-analytic findings are compatible with the average correlation between pairs of clinicians being only about 0.2, a very weak level of agreement.This is not to say that there is no consistency among the clinicians, or that there is no value in summarizing that consistency, but it does indicate that there is a great deal of diversity as well. Clinicians’ folk taxonomies seem to be highly idiosyncratic, more a Babel of distinctive classifications than a chorus of agreement. It is therefore risky to draw strong generalizations about how clinicians classify, and to imply that there is a single consensual taxonomy.Several things are very interesting about this diversity of classifications. First, Flanagan and Blashfield show that it cannot be explained by the clinicians’ differing levels of experience or by the different methodologies used to elicit their taxonomies. The variability among clinicians must therefore have some other basis, which awaits further investigation. Second, the level of agreement (“consensus”) obtained here is significantly lower than what has been found in more orthodox studies of folk taxonomy. By implication, the classification of psychiatric disorders is a slipperier enterprise than the classification of animals and plants. People who have extensive professional experience and training in the field of psychopathology—vocational training that includes the standardizing forces of accrediting bodies and a dominant psychiatric nosology—nevertheless tend not to agree substantially about how to map that territory. One guess about why this might be is that clinicians’ folk taxonomies are not merely descriptive maps of the interrelations among diagnostic entities, but are... (shrink)

In three experiments, we investigated the computational complexity of German reciprocal sentences with different quantificational antecedents. Building upon the tractable cognition thesis (van Rooij, 2008) and its application to the verification of quantifiers (Szymanik, 2010) we predicted complexity differences among these sentences. Reciprocals with all-antecedents are expected to preferably receive a strong interpretation (Dalrymple et al., 1998), but reciprocals with proportional or numerical quantifier antecedents should be interpreted weakly. Experiment 1, where participants completed pictures according to their preferred interpretation, (...) provides evidence for these predictions. Experiment 2 was a picture verification task. The results show that the strong interpretation was in fact possible for tractable all but one-reciprocals, but not for exactly n. The last experiment manipulated monotonicity of the quantifier antecedents. (shrink)

The paper argues that two distinct and independent notions of plurality are involved in natural language anaphora and quantification: plural reference (the usual non-atomic individuals) and plural discourse reference, i.e., reference to a quantificational dependency between sets of objects (e.g., atomic/non-atomic individuals) that is established and subsequently elaborated upon in discourse. Following van den Berg (PhD dissertation, University of Amsterdam, 1996), plural discourse reference is modeled as plural information states (i.e., as sets of variable assignments) in a new dynamic system (...) couched in classical type logic that extends Compositional DRT (Muskens, Linguistics and Philosophy, 19, 143-186, 1996). Given the underlying type logic, compositionality at sub-clausal level follows automatically and standard techniques from Montague semantics become available. The idea that plural info states are semantically necessary (in addition to non-atomic individuals) is motivated by relative-clause donkey sentences with multiple instances of singular donkey anaphora that have mixed (weak and strong) readings. At the same time, allowing for non-atomic individuals in addition to plural info states enables us to capture the intuitive parallels between singular and plural (donkey) anaphora, while deriving the incompatibility between singular (donkey) anaphora and collective predicates. The system also accounts for empirically unrelated phenomena, e.g., the uniqueness effects associated with singular (donkey) anaphora discussed in Kadmon (Linguistics and Philosophy, 13, 273-324, 1990) and Heim (Linguistics and Philosophy, 13, 131-177, 1990) among others. (shrink)

The term ‘emergence’ often causes confusion in science and philosophy, as it is used to express at least two quite different concepts. We can label these concepts _strong_ _emergence_ and _weak emergence_. Both of these concepts are important, but it is vital to keep them separate.

It is generally accepted that Popper‘s degree of corroboration, though “inductivist” in a very general and weak sense, is not inductivist in a strong sense, i.e. when by ‘inductivism’ we mean the thesis that the right measure of evidential support has a probabilistic character. The aim of this paper is to challenge this common view by arguing that Popper can be regarded as an inductivist, not only in the weak broad sense but also in a narrower, probabilistic (...) sense. In section 2, first, I begin by briefly characterizing the relevant notion of inductivism that is at stake here; second, I present and discuss the main Popperian argument against it and show that in the only reading in which the argument is formally it is restricted to cases of predicted evidence, and that even if restricted in this way the argument is formally valid it is nevertheless materially unsound. In section 3, I analyze the desiderata that, according to Popper, any acceptable measure for evidential support must satisfy, I clean away its ad-hoc components and show that all the remaining desiderata are satisfied by inductuvist-in-strict-sense measures. In section 4 I demonstrate that two of these desiderata, accepted by Popper, imply that in cases of predicted evidence any measure that satisfies them is qualitatively indistinguishable from conditional probability. Finally I defend that this amounts to a kind of strong inductivism that enters into conflict with Popper’s anti-inductivist argument and declarations, and that this conflict does not depend on the incremental versus non-incremental distinction for evidential-support measures, making Popper’s position inconsistent in any reading.Keywords: Popper; Inductivism; Confirmation; Corroboration. (shrink)

In "Supervenience, Necessary Coextension, and Reducibility" (Philosophical Studies 49, 1986, 163-176), among other results, I showed that weak or ordinary supervenience is equivalent to Jaegwon Kim's strong supervenience, given certain assumptions: S4 modality, the usual modal conception of properties as class-concepts, and diagonal closure or resplicing of the set of base properties. This last means that any mapping of possible worlds into extensions of base properties counts itself as a base property. James Van Cleve attacks the modal conception (...) of property and diagonal closure. To me it seems desperate to reject diagonal closure merely in order to save supervenience-materialism. But I concede that it may be unacceptable in the context of a sparser theory of properties. (shrink)

It is common in recent epistemology to distinguish different senses, or conceptions, of epistemic justification. The proposed oppositions include the objective/subjective, internalist/externalist, regulative/nonregulative, resource-relative/resource-independent, personal/verific, and deontological/evaluative conceptions of justification. In some of these cases, writers regard both members of the contrasting pair as legitimate; in other cases only one member. In this paper I want to propose another contrasting pair of conceptions of justification, and hold that both are defensible and legitimate. The contrast will then be used to construct (...) a modified version of reliabilism, one which handles certain problem cases more naturally than my previous versions of reliabilism. (shrink)

Fine has shown that assigning any value to the Pasadena game is consistent with a certain standard set of axioms for decision theory. However, I suggest that it might be reasonable to believe that the value of an individual game is constrained by the long-run payout of repeated plays of the game. Although there is no value that repeated plays of the Pasadena game converges to in the standard strong sense, I show that there is a weaker sort of (...) convergence it exhibits, and use this to define a notion of ‘weak expectation’ that can give values to the Pasadena game and many others, though not to all games that fail to have a strong expectation in the standard sense. CiteULike Connotea Del.icio.us What's this? (shrink)

According to the knowledge norm of belief, one should believe p only if one knows p. However, it can easily seem that the ordinary notion of belief is much weaker than the knowledge norm would have it. It is possible to rationally believe things one knows to be unknown The aim of belief, Oxford University Press, Oxford, 2013). One response to this observation is to develop a technical notion of ‘outright’ belief. A challenge for this line of response is to (...) find a way of getting a grip on the targeted notion of belief. In order to meet this challenge, I characterize ‘outright’ belief in this paper as the strongest belief state implied by knowledge. I show that outright belief so construed allows this notion to play important theoretical roles in connection with knowledge, assertion and action. (shrink)

One common objection against the Principle of Sufficient Reason is that it leads to a highly counterintuitive position, namely, necessitarianism. In this paper, drawing on Avicenna’s modal theory, I differentiate between two versions of necessitarianism: strong necessitarianism and weak necessitarianism. I argue that the modal intuition driving this objection pertains to strong necessitarianism, while the Principle of Sufficient Reason, at most, leads to weak necessitarianism.

The thesis of existentialism holds that if a proposition p exists and predicates something of an object a, then in any world where a does not exist, p does not exist either. If “possibly, p” entails “in some possible world, the proposition that p exists and is true,” then existentialism is prima facie incompatible with the truth of claims like “possibly, the Eiffel Tower does not exist.” In order to avoid this claim, a distinction between two kinds of world-indexed truth (...) –and two associated kinds of modality –is needed. This paper embodies an attempt to develop a full account of just such a distinction. (shrink)

In the literature, regress arguments often take one of two different forms: either they conclude that a given solution fails to solve any problem of a certain kind (the strong conclusion), or they conclude that a given solution fails to solve all problems of a certain kind (the weaker conclusion). This gives rise to a logical problem: do regresses entail the strong or the weaker conclusion, or none? In this paper I demonstrate that regress arguments can in fact (...) take both forms, and clearly set out the logical difference between them. Throughout the paper, I confine myself to metaphysical examples from the early Russell. Only now that we know they are valid can we start to discuss whether they are sound. (shrink)

The health theories of Nordenfelt and Boorse are compared. Critical attention is focused on Nordenfelt's description of his theory as one of holistic welfare, contrasting with Boorse's analytical and statistical approach. Neither theory is found to give an entirely satisfactory account of ‘health’ in scientific medicine or common usage. Because Nordenfelt attenuates the ontological significance of organs and organ parts and simplifies the role of statistics, his theory is regarded as weakly holistic. Boorse underrates the importance of non-statistical evaluation. A (...) mediating position, termed ‘strong holism’ is suggested as a way of integrating normative and statistical elements in a more adequate health concept. (shrink)

Marušić & Schwenkler (Analytic Philosophy, 59, 309) offer a simple and elegant defense of strong cognitivism about intention: the view that an intention to φ is a form of belief that one will φ. I show that their defense fails: however simple and elegant, it fails to account for various aspects about intention and its expression, and faces distinctive challenges of its own, including a dilemma and counterexample. These also undermine Marušić & Schwenkler's claim to a best-explanation type of (...) account and recommend alternatives to strong cognitivism altogether. (shrink)

Eine patientengerechte Versorgung ist ein hohes Ziel. Unangemessene Behandlung wie Unter- oder Überversorgung zu erkennen und zu vermeiden, stellt Ärztinnen/Ärzte und Pflegende am Krankenbett vor schwierige Entscheidungen. Hier ist die Entwicklung von praxistauglichen Orientierungshilfen angezeigt, die wissenschaftlichen Kriterien genügen und nicht allein auf Konsens beruhen. Die vorliegende Arbeit versucht, zentrale Normen zur Vermeidung von Über- und Unterversorgung zu formulieren und theoretisch zu fundieren. Dafür wird auf Basis einer Interessen-basierten Ethik eine Graduierung der Autonomie vorgenommen, indem zwischen schwacher und starker Autonomie (...) unterschieden wird. (shrink)

Dutch, like other Germanic languages, disposes of two strategies to express past tense: the strong inflection (e.g., rijden – reed ‘drive – drove’) and the weak inflection (spelen – speelde ‘play – played’). This distinction is for the most part lexically determined in that each verb occurs in one of the two inflections. Diachronically the system is in flux though, with the resilience of some verbs being mainly driven by frequency. Synchronically this might result in variable verbs (e.g., (...) schuilen – schuilde/school ‘hide – hid’ or raden – raadde/ried ‘guess – guessed’). This diachronic (1300–2000) corpus study shows that this variation is not haphazard, but that semantic factors are at play. We see two such effects. First of all, synchronically, the variation is exapted in an iconic manner to express aspect: durative meanings tend to be expressed by longer verb forms and punctual meanings tend to be expressed by shorter verb forms. Secondly, we see that metaphorical meanings come to be associated within obsolescent inflectional forms, as predicted by Kuryłowicz’s “fourth law of analogy”. (shrink)

What does it mean that an object has instrumental value? While some writers seem to think it means that the object bears a value, and that instrumental value accordingly is a kind of value, other writers seem to think that the object is not a value bearer but is only what is conducive to something of value. Contrary to what is the general view among philosophers of value, I argue that if instrumental value is a kind of value, then it (...) is a kind of extrinsic final value. (shrink)

What does it mean that an object has instrumental value? While some writers seem to think it means that the object bears a value, and that instrumental value accordingly is a kind of value, other writers seem to think that the object is not a value bearer but is only what is conducive to something of value. Contrary to what is the general view among philosophers of value, I argue that if instrumental value is a kind of value, then it (...) is a kind of extrinsic final value. (shrink)

In this paper we propose an extension of Defeasible Logic to represent and compute different concepts of defeasible permission. In particular, we discuss some types of explicit permissive norms that work as exceptions to opposite obligations or encode permissive rights. Moreover, we show how strong permissions can be represented both with, and without introducing a new consequence relation for inferring conclusions from explicit permissive norms. Finally, we illustrate how a preference operator applicable to contrary-to-duty obligations can be combined with (...) a new operator representing ordered sequences of strong permissions. The logical system is studied from a computational standpoint and is shown to have linear computational complexity. (shrink)