A nonlinear differential equation model is proposed to study the dynamics of HIV/AIDS and its effects on workforce productivity. The disease-free equilibrium point of the model is shown to be locally asymptotically stable when the associated basic reproduction number $$\mathcal{{R}}_{0}$$ is less than unity. The model is also shown to exhibit multiple endemic states for some parameter values when $$\mathcal{{R}}_{0} 1$$. Global asymptotic stability of the disease-free equilibrium is guaranteed only when the fractions of the Susceptible subclass populations are within (...) some bounds. Optimal control analysis of the model revealed that the most cost effective strategy that should be adopted in the fight against HIV/AIDS spread within the workforce is one that seeks to prevent infections and the treatment of infected individuals. (shrink)

The aim of this paper is to distinguish between, and examine, three issues surrounding Humphreys's paradox and interpretation of conditional propensities. The first issue involves the controversy over the interpretation of inverse conditional propensities — conditional propensities in which the conditioned event occurs before the conditioning event. The second issue is the consistency of the dispositional nature of the propensity interpretation and the inversion theorems of the probability calculus, where an inversion theorem is any theorem of probability that makes explicit (...) (or implicit) appeal to a conditional probability and its corresponding inverse conditional probability. The third issue concerns the relationship between the notion of stochastic independence which is supported by the propensity interpretation, and various notions of causal independence. In examining each of these issues, it is argued that the dispositional character of the propensity interpretation provides a consistent and useful interpretation of the probability calculus. (shrink)

This volume presents a selection of essays by the leading philosopher Christopher S. Hill. Together, they address central philosophical issues related to four key concerns: the nature of truth; the relation between experiences and brain states; the relation between experiences and representational states; and problems concerning knowledge.

This is a book about sensory states and their apparent characteristics. It confronts a whole series of metaphysical and epistemological questions and presents an argument for type materialism: the view that sensory states are identical with the neural states with which they are correlated. According to type materialism, sensations are only possessed by human beings and members of related biological species; silicon-based androids cannot have sensations. The author rebuts several other rival theories, and explores a number of important issues: the (...) forms and limits of introspective awareness of sensations, the semantic properties of sensory concepts, knowledge of other minds, and unity of consciousness. The book is a significant contribution to the philosophy of mind, and has much to say to psychologists and cognitive scientists. (shrink)

In the first chapter of his Knowledge and Lotteries, John Hawthorne argues that thinkers do not ordinarily know lottery propositions. His arguments depend on claims about the intimate connections between knowledge and assertion, epistemic possibility, practical reasoning, and theoretical reasoning. In this paper, we cast doubt on the proposed connections. We also put forward an alternative picture of belief and reasoning. In particular, we argue that assertion is governed by a Gricean constraint that makes no reference to knowledge, and that (...) practical reasoning has more to do with rational degrees of belief than with states of knowledge. (shrink)

Drawing on Ezekiel Emanuel’s controversial piece ‘Why I hope to die at 75,’ I distinguish two types of concern in ethical debates about extending the human lifespan. The first focusses on the value of living longer from prudential and social perspectives. The second type of concern, which has received less attention, focusses on the value of aiming for longer life. This distinction, which is overlooked in the ethical literature on life extension, is significant because there are features of human psychology (...) and the structure of a life that should give pause when considering how long one should aim to live, but which do not neatly coincide with considerations about how valuable additional life is likely to be. I argue that, while Emanuel’s case for hoping to die at 75 is unconvincing, he nonetheless provides weak pro tanto considerations in favour of taking a moderate life span as a prudential aim around which to base at least some significant life plans. (shrink)

This book presents a comprehensive theory of consciousness. The initial chapter distinguishes six main forms of consciousness and sketches an account of each one. Later chapters focus on phenomenal consciousness, consciousness of, and introspective consciousness. In discussing phenomenal consciousness, Hill develops the representational theory of mind in new directions, arguing that all awareness involves representations, even awareness of qualitative states like pain. He then uses this view to undercut dualistic accounts of qualitative states. Other topics include visual awareness, visual appearances, (...) emotional qualia, and meta-cognitive processing. This important work will interest a wide readership of students and scholars in philosophy of mind and cognitive science. (shrink)

There is an important family of semantic notions that we apply to thoughts and to the conceptual constituents of thoughts - as when we say that the thought that the Universe is expanding is true. Thought and World presents a theory of the content of such notions. The theory is largely deflationary in spirit, in the sense that it represents a broad range of semantic notions - including the concept of truth - as being entirely free from substantive metaphysical and (...) empirical presuppositions. At the same time, however, it takes seriously and seeks to explain the intuition that there is a metaphysically or empirically 'deep' relation linking thoughts to reality. Thus, the theory represents a kind of compromise between deflationism and versions of the correspondence theory of truth. This book will appeal to students and professionals interested in the philosophy of logic and language. (shrink)

Essays honoring the work of Catholic ethicist James F. Keenan.

This article contends that Socratic wisdom (sophia) in Plato's Apology should be understood in relation to moderation (sophrosune), not knowledge (episteme). This stance is exemplified in an interpretation of Socrates' disavowal of knowledge. The god calls Socrates wise. Socrates holds both that he is wise in nothing great or small and that the god does not lie. These apparently inconsistent claims are resolved in an interpretation of elenchus. This interpretion says that Socrates is wise insofar as he does not believe (...) himself to know what he does not know. Whether one knows is demonstrated through elenchus, which moderates between knowledge claims. Thus, elenchus is productive of a kind of wisdom even if it does not produce knowledge. This claim, if true, forms a suitable basis for Socrates' defense of himself. That it does so serves as further evidence for the interpretation of sophia as sophrosune. (shrink)

One of the strongest objections to the development and use of substantially life-extending interventions is that they would exacerbate existing unjust disparities of healthy lifespans between rich and poor members of society. In both popular opinion and ethical theory, this consequence is sometimes thought to justify a ban on life-prolonging technologies. However, the practical and ethical drawbacks of banning receive little attention, and the viability of alternative policies is seldom considered. Moreover, where ethicists do propose alternatives, there is scant effort (...) to consider their merits in light of developing world priorities. In response to these shortcomings, I distinguish four policy options and, on the basis of a plausible intuition about fairness, evaluate their implications for a fair distribution of healthy lifespans. I claim that even in developing nations it would be fairest to favor policies that promote equal access to at least one promising category of substantially life-extending intervention: calorie restriction mimetics. (shrink)

L'excavation d'Amorium débute en 1987 et rend compte des développements et des changements que la cité a connu de l'antiquité tardive jusqu'au haut moyen-âge mais surtout dans les siècles sombres de l'Empire byzantin c'est-à-dire du 7e au 9e siècle. Cette ville a été choisie car elle a été une grande capitale de l'Empire byzantin, la cité la plus grande et la plus importante de l'Anatolie du 7e au 9e siècle. L'A. étudie son urbanisme à cette époque là, les murs de (...) la cité basse, les fortifications de la cité haute ainsi que l'église de la ville basse probablement construite à la fin du 5e siècle et qui a joué un rôle significatif dans la cité. (shrink)

Thanks to a helpful tetradic diagram found in the expanded fifth edition of John Deely’s Basics of Semiotics, in which the context and circumstances of a sign’s utterance (in addition to the sign-vehicle itself and the immediate object of the sign) is distinguished from all that is explicit in the sign itself apart from the context and circumstances of its utterance, it is possible to bring Deely’s insights to bear upon the semiotically suggestive work of Marshall McLuhan. McLuhan’s implicitly semiotic (...) understanding of analogy is structurally present in his efforts to visually articulate the “laws of media” with his own “tetrad” diagrams. Deely’s discussion of the irreducible triadicity of signs therefore illuminates McLuhan’s attempt to understand how analogical thought actually works on the most fundamental structural level in the cognition of the semiotic animal. There is a unique cognitive syntax to analogy, which is operative in the animal that Deely has most appropriately identified as “the semiotic animal”. This article discusses McLuhan’s understanding of analogy in terms of its figure/ground structure, by using the example of the thermometer from Deely’s Basics of Semiotics. In relating this example to McLuhan’s tetrad, it is shown how McLuhan’s implicitly semiotic analysis can also increase our semiotic understanding of other technological tools, such as Skype videoconferencing. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:A Model for the Many Senses of ScriptureFrom the Literal to the Spiritual in Genesis 22 with Thomas AquinasChristopher S. Morrissey (bio)Introduction: Many Senses Require Many TranslationsOn the mountain the Lord appeared (NETS, Gen. 22:14b)On the mount of the LORD it shall be provided (RSV)1In the mount of the LORD it shall be seen (KJV)On the mountain the LORD will see (NAB)ἐν τῷ ὄρει κύριος ὤφθη (LXX)in monte Dominus (...) videtur (Nova Vulgata)in monte Dominus videbit (St. Jerome’s Vulgate)In his book Abraham’s Curse, Bruce Chilton argues that in Gen. 22:14b, “the Septuagint’s Greek renders the Hebrew text” correctly (i.e., “with Yahweh as the subject of the verb”), whereas English translations like the King James Version (KJV) prefer to imply that the ram is the verbal subject. Chilton contends that “This is a case of translators caring more about doctrine than wording, and attempting to legislate what the Bible can say.”2Chilton’s textual exegesis does have some value. He notes that “Contextually [End Page 231] as well as grammatically, God is the subject: Yahweh ‘was seen’ on Moriah, liberating Isaac by means of divine intervention.”3 But with his polemics against the KJV, he fails to affirm the rich polysemy of the passage. He replaces one literal reading with another and then argues as if the two are at odds. But Scripture has many senses, a truth famously expressed in the medieval distich of Augustine of Dacia, best known in the version of Nicholas of Lyra: “The literal sense teaches what happened; what you believe, the allegorical; the moral, what you should do; where you are going, the anagogical.”4 Therefore Chilton is wrong to impute bad motives to anyone who would attempt to unfold the spiritual sense of a passage (“caring more about doctrine”), or even to anyone who would note that a passage has more than one literal meaning.Chilton’s own insistence on uncovering the univocal original meaning of a passage (through his preferred historical method of “generative exegesis”)5 is excessively literal, as if recourse to grammar would allow one “to legislate what the Bible can say.” When Chilton says “Yahweh ‘was seen’ on Moriah,” he is not contending that God was seen directly, literally, but rather interpreting the metaphorical or parabolical sense of the phrase “Yahweh was seen” (in Gen. 22:14b), because he glosses the meaning of the metaphor as “liberating Isaac by means of divine intervention”;6 that is, God is seen indirectly, cognitively, rather than literally with the eyes. Because literally seeing a ram is not opposed to cognitively understanding God’s action, the KJV, pace Chilton, can be defended contextually. To my mind, the Revised Standard Version (RSV), echoing the KJV, does the best job of rendering the Hebrew text literally, with “On the mount of the lord it shall be provided,” because this leaves open the many senses of the third person singular “it,” to be unfolded by exegesis. Thus more than one translation is required in order to appreciate all the significations being deployed in the treatment of “seeing” in Gen. 22:8 and 22:14. “It shall be provided”: More than one univocal sense of the “it” has to be uncovered by exegesis in this Scripture, in order to see what “it” is all about.To justify my opinion that the RSV most felicitously translates the Hebrew, I would like to prepare the way to a conclusion in which I compare the Septuagint’s translation (which follows Chilton’s preferred rendering of the context) with the Vulgate Latin translations. The path toward this conclusion will show that Chilton’s polemics, indicative of an exegetical attitude that is hostile to an appreciation of the many senses of Scripture, fail to see how the RSV translation is also defensible as keeping the reader’s mind open to the many senses of the Scriptural passage. But first things first. With the help of St. Thomas Aquinas, let me distinguish the various senses of Scripture and then point out how they are all exemplified here, all being signified by the text. [End Page 232] Click for larger view View... (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Journal of the History of Ideas 62.1 (2001) 17-35 [Access article in PDF] Late Antiquity and the Florentine Renaissance: Historiographical Parallels Christopher S. Celenza Aulus Gellius, at the end of the second century, shows us the type of writer who was destined to prevail, the compiler. In his Noctes Atticae he compiles without method or even without any definite end in view.... After him there is only barrenness. (...) The third century is a literary Sahara.... Thoughtless admiration for mathematics keeps up or reintroduces the mentality of magic.... In the fourth century ad Iamblichus had his brain almost turned by the science of numbers. 1 --Ferdinand Lot The rapid progress of humanism after the year 1400 paralyzed native impulses. Henceforth men looked only to antiquity for the solution of every problem, and consequently allowed literature to sink into mere quotation. 2 --Jacob Burckhardt Various aspects of late antiquity in western Europe and the Florentine Renaissance bear certain similarities which, if properly examined and contextualized, can lead to a deeper understanding of both periods--of their social as well as intellectual significance, of the manner in which politics relates to culture, and [End Page 17] of the relationship between urban life in a specific sort of milieu to the mechanisms of religious and philosophical dynamism. 3 The parallels are not always exact, but various underlying patterns are present. Here the main line of argument will be that a number of aspects of late ancient thought and of Renaissance thought (especially Renaissance Latin literature of all genres) went ignored by eighteenth- and nineteenth-century scholars, thanks to certain underlying assumptions concerning what was appropriate to investigate. These assumptions were themselves related to the combination of two major factors: romantic essentializing ideas about the nature of language, inherited from the Enlightenment, and the development in the nineteenth century of nationalist, evolutionary historiographies. The results of these developments persisted into the twentieth century and can be seen to an extent even today. Nationalist Historiographies and the Problem of Language "Gentlemen, nations are thoughts of God." So Leopold von Ranke (1795-1886) used to begin his history courses in Berlin, as Jacob Burckhardt (1818-97) later remembered. 4 While Ranke himself was concerned primarily with documentary history and the evolution of the modern state, he was also part of a larger trend in the German speaking world which sought to identify, in the study of the past, the spirit, or Geist, of a given era or people, a project which had been theorized by Hegel. Ranke and others, like Johann Gustav Droysen and August Böckh, taking their point of departure from Barthold Niebuhr and, more immediately, from Wilhelm von Humboldt, saw themselves as self-consciously transcending Hegel, basing their ideas on documentary sources as opposed to a priori theorizing. 5 But certain assumptions were similar, none more so than presuppositions relating to the Volksgeist. It is not that Ranke was relentlessly teleological; [End Page 18] history was made in the process of the unfolding of events. His primary mission was the documenting and understanding of modernity, a task which, despite their later divergences in practice, Burckhardt shared. 6 The goal was, following Niebuhr's approach in classical studies, to present history in an appealing way and in a manner useful to modernity. 7 This was bound up with a larger set of movements, encompassing the search for national identity and a tendency toward locating essential characteristics of a "people." 8 One of these characteristics was language, and a central preoccupation of scholars became the manner in which culture expressed itself through language, even as philology was becoming "the first historical discipline, the model for all other historical sciences" and the general view of scholarly fields as separate, specialized entities was growing. 9In their concern with language as a vehicle for cultural transmission and as a defining characteristic of a people, nineteenth-century scholars were the heirs of the Enlightenment. Ideas of a plurality of cultures had flourished; as it was put in the Encyclopédie, language expressed the "genius of a people." If... (shrink)

Department of Philosophy Brown University Providence, RI 02912.

In order to defend her claim that the concept object is biologically determined, Carey must answer Quine's gavagai argument, which purports to show that mastery of any concept with determinate reference presupposes a substantial repertoire of logical concepts. I maintain that the gavagai argument withstands the experimental data that Carey provides, but that it yields to an a priori argument.

“Dromenon” was and is the rubric governing the fourth and final floor of Aby Warburg's Library. The word means “the thing done,” “the action,” and in the context of the Greek Mysteries referred to rites, as opposed to words and images. In the Warburg Library in London, dromenon covers law, social institutions, folklore, and customs, among which Warburg located politics. This essay is in large part a reflection on what Warburg understood by politics and its inherent conflict with libraries. For (...) Warburg, both politics and libraries were ways of managing time; and the basic irony underscored in this article is that academic politics in the UK is now threatening the Warburg Library's continued existence. (shrink)

Lapo da Castiglionchio the Younger was a Florentine Renaissance humanist who died in 1438 at the age of thirty-three. He took part in one of the most interesting phases of Italian Renaissance humanism and achieved in his short lifetime a modest reputation as a first-rate Greek to Latin translator. Less well known is the fact that he wrote a fair amount of prose works. One of the most interesting of these is a treatise which he composed in the year of (...) his death, entitled De curie commodis, or, On the Benefits of the Curia, a portrait of the papal Curia which is written elegantly, learnedly, earnestly, and angrily. ;The goal of this study is to discuss this dialogue in its intellectual and social contexts; there are three chapters. The first is a general introduction to Lapo's life and work, to the dialogue itself, and to the historiography on the De curie commodis. The second chapter discusses the manner in which Lapo employs the virtues in a Stoicizing fashion as persuasive tools in the environment of Italian humanism. It is argued that his particular treatment of the virtues can serve as a key for interpreting the dialogue as a whole. The third chapter touches both on social historical issues in the De curie commodis and on Lapo's defense or curial wealth. ;There has been no adequate edition of the Latin text, based on a wide enough variety of extant manuscripts, nor has the De curie commodis ever been translated into English . Therefore, a thorough critical edition of the Latin text along with an annotated English translation follows the discussion. ;The treatise has been notoriously difficult to interpret and seems often to prevaricate. The interpretive conclusion of this study is that Lapo wrote as a well-informed but liminal figure in the socio-cultural environment of the papal Curia--as an outsider who desired to become a full-fledged insider. The De curie commodis is not the parting shot of a fed-up hanger-on; it is instead Lapo's last-ditch, highly critical but nonetheless sincere attempt to find a patron who would allow him to join a cultural ambient at which he marvelled but from which he felt himself unjustly excluded. (shrink)