We use some simple facts about the wtt-degrees of r.e. sets together with a construction to answer some questions concerning the join and meet operators in the r.e. degrees. The construction is that of an r.e. Turing degree a with just one wtt-degree in a such that a is the join of a minimal pair of r.e. degrees. We hope to illustrate the usefulness of studying the stronger reducibility orderings of r.e. sets for providing information about Turing reducibility.

A splitting of an r.e. set A is a pair A1, A2 of disjoint r.e. sets such that A1 A2 = A. Theorems about splittings have played an important role in recursion theory. One of the main reasons for this is that a splitting of A is a decomposition of A in both the lattice, , of recursively enumerable sets and in the uppersemilattice, R, of recursively enumerable degrees . Thus splitting theor ems have been used to obtain results about (...) the structure of , the structure of R, and the relationship between the two structures. Furthermore it is fair to say that questions about splittings have often generated important new technical developments in recursion theory. In this article we survey most of the results and techniques associated with splitting properties of r.e. sets in ordinary recursion theory. (shrink)

A splitting A1A2 = A of an r.e. set A is called a Friedberg splitting if for any r.e. set W with W — A not r.e., W — Ai≠0 for I = 1,2. In an earlier paper, the authors investigated Friedberg splittings of maximal sets and showed that they formed an orbit with very interesting degree-theoretical properties. In the present paper we continue our investigations, this time analyzing Friedberg splittings and in particular their orbits and degrees for various classes (...) of r.e. sets. (shrink)

A paradigm of scientific discovery is defined within a first-order logical framework. It is shown that within this paradigm there exists a formal scientist that is Turing computable and universal in the sense that it solves every problem that any scientist can solve. It is also shown that universal scientists exist for no regular logics that extend first-order logic and satisfy the Löwenheim-Skolem condition.

We examine the prospects for finding “best possible” or “ideal” computing machines for various learning tasks. For this purpose, several precise senses of “ideal machine” are considered within the context of formal learning theory. Generally negative results are provided concerning the existence of ideal learning‐machines in the senses considered.

We advance a model of human probability judgment and apply it to the design of an extrapolation algorithm. Such an algorithm examines a person's judgment about the likelihood of various statements and is then able to predict the same person's judgments about new statements. The algorithm is tested against judgments produced by thirty undergraduates asked to assign probabilities to statements about mammals.

The overarching theme of Michael Kochin's Five Chapters on Rhetoric seems to be that classical rhetoric is still important. With the help of Socrates, Plato, Aristotle, Gorgias, Callicles, Protagoras, Isocrates, Cicero, Quintilian, and others, Kochin makes the case that when thinking about rhetoric, we ought to listen to the ancients—at least most of the time. While the overarching theme deals with the classical tradition, the book's central argument is focused squarely on current rhetorical practices. The proper role of rhetoric, (...) Kochin argues, is to allow "the facts" to "speak for themselves" (164). He attempts to establish this claim by exploring five concepts that are, or ought to be, central to our .. (shrink)

William Gavin’s William James in Focus: Willing to Believe is a brief and creative introduction to James’s philosophy aimed at students and non-specialists. As the subtitle of the book suggests, Gavin uses James’s will to believe doctrine as the organizing theme for his interpretation of James’s philosophy. One might initially think that this implies reading the latter in the light of James’s views on religion, but Gavin downplays the religious aspects of James’s will to believe doctrine and focuses instead on (...) its relevance for understanding what he terms the “latent image” of James’s personal life, which according to Gavin is primarily concerned with human mortality and the need to affirm philosophical positions.. (shrink)

This book defends a form of ethical intuitionism, according to which (i) there are objective moral truths; (ii) we know some of these truths through a kind of immediate, intellectual awareness, or "intuition"; and (iii) our knowledge of moral truths gives us reasons for action independent of our desires. The author rebuts all the major objections to this theory and shows that the alternative theories about the nature of ethics all face grave difficulties.

Part I: The representation of life -- Can life be given a real definition? -- The representation of the living individual -- The representation of the life-form itself -- Part II: Naive action theory -- Types of practical explanation -- Naive explanation of action -- Action and time -- Part III: Practical generality -- Two tendencies in practical philosophy -- Practices and dispositions as sources of the goodness of individual actions -- Practice and disposition as sources of individual action.

The first edition of The Scientific Background to Modern Philosophy took the dialogue of science and philosophy from Aristotle through to Newton. This second edition adds eight chapters, taking the dialogue through the Enlightenment and up to Darwin. This anthology is an attempt to help bridge the gap between the history of science and the history of philosophy.

In lieu of an abstract, here is a brief excerpt of the content:Kenneth Burke, John Dewey, and the Pursuit of the PublicPaul StobIn Deliberation Day, Bruce Ackerman and James Fishkin argue for the creation of a national holiday, "Deliberation Day," in which citizens come together over a two-day period in their local schools and community centers to deliberate over the merits of presidential candidates and their platforms (Ackerman and Fishkin 2004). While Ackerman and Fishkin propose that the government pay each (...) citizen a $150 stipend for voluntary participation, the purpose is not so much to monetarily to reward citizens for "showing up" as it is to foster an enriched civic culture that would send shockwaves through America's political infrastructure: "If Deliberation Day succeeded, everything else would change: the candidates, the media, the activists, the interest groups, the spin doctors, the advertisers, the pollsters, the fund raisers, the lobbyists, the political parties. All would have no choice but to adapt to a more attentive and informed public" (3). The task of Deliberation Day would be to create a new social context in which citizens could become enlightened through public participation. As the authors conclude the book, "We can, through an act of political imagination, create new institutions for redeeming the ancient promise of democratic citizenship. Ordinary men and women need not be the hapless playthings of the powerful. They can and must find new ways to hold their leaders to account, and redeem their dignity as human beings by responsibly shaping their collective destiny" (219).Ackerman and Fishkin's proposal is indeed filled with political imagination. I bring their proposal to light not to critique the possibilities and limitations of Deliberation Day, but to understand the way in which the authors understand "the public." At the bottom, what the polity needs, Ackerman and Fishkin believe, is a public space dedicated to the reinvigoration [End Page 226] of political culture. It is not that the citizenry is incapable of hammering out intelligent political solutions, but that it needs access to social contexts that facilitate deliberation and the emergence of a common good. To foster a culture of political intelligence, the public needs only the chance to enter the forums that will facilitate thorough, cooperative political decision-making.Ackerman and Fishkin are not alone in calling for access to or creation of these types of forums. Habermas's bourgeois public sphere—a public space in which citizens could come together and rationally debate the activities of the state—essentially represents the evolution of a context, a social space, a public arena (Habermas 1989). The bourgeois public sphere is meant to be egalitarian, providing citizens a forum in which to debate openly and foster a common political consciousness.1 But this sphere has proved problematic for a number of scholars. Oskar Negt and Alexander Kluge (1993), for example, propose a proletarian public sphere to counter capitalism's socioeconomic domination over public resources. Joan Landes (1988) argues that the bourgeois public sphere entails male domination in public life, to the exclusion of women. Nancy Fraser (1992) builds on the feminist critique by adopting the term "counterpublics," collectives of citizens—women, peasants, the working class, and other groups demarcated by issues of race, gender, and ethnicity—that arise in reaction to the dominant public sphere.2In the introduction to Counterpublics and the State (2001), Robert Asen and Daniel Brouwer argue that critiques of the bourgeois public sphere specifically and public sphere theory generally amount to three "reconfigurations" in the way in which scholars think of the public. First, scholars have come to recognize the existence and interaction of multiple public spheres. Second, they have come to acknowledge permeable boundaries of access to the multiple public spheres. Third, scholars have come to recognize the dynamic role of the state in shaping public discourse. One considerable result of these three reconfigurations is an increasing recognition of the political divisions that permeate society (Asen and Brouwer 2001, 17-25).If Asen and Brouwer are right, and I think they are, these three reconfigurations represent the general thrust of contemporary public sphere scholarship, including as it is understood among communication scholars.3 And however diverse such scholarship may be, a few common themes seem to recur across... (shrink)

In lieu of an abstract, here is a brief excerpt of the content:"Terministic Screens," Social Constructionism, and the Language of Experience:Kenneth Burke's Utilization of William JamesPaul StobKenneth Burke's influence on various academic disciplines is clear in the number of books and articles published annually on his thought. It is also clear insofar as academics continue to turn to his work for insights on handling scholarly problems. That is to say, not only do we explore the dimensions of his work, we (...) also bring it to bear on current disputes in the hopes of clarifying or moving past the issues we face. His thought, in short, has a currency that transcends its historical period. "As we meet new challenges that echo the past," writes Ross Wolin, "Burke's inquiries into meaning, orientation, faction, communication, and rhetoric are as urgent today as when Burke raised them long ago and for decades after."1By bringing the terms of Burke's work to bear on current disputes, we connect him to the vocabularies and discourses that surround us. His thought becomes familiar through the lenses we employ, as we intermix his ideas with our own terminology and see his work through the language of our discussions. One example of this phenomenon is the way scholars have been describing Burke's philosophical outlook. Burke's thought, we are told, is that of a social constructionist. Edward Schiappa, for example, concludes that Burke gives us a view of the world as intersubjectively created: "Our understanding is social in the sense that our concepts are human-made and are part of a shared language. Our understanding is [End Page 130] constructed in the sense that our claims, interpretations, and orientations constitute 'conceptual fabrics' that weave together contingent sets of beliefs and social practices."2 Paul Jay turns the sentiment into a more explicitly epistemological point: "The most radical aspect of Burke's evolving theory of language at this time is his recognition that language—inherently metaphorical—constructs rather than reflects knowledge."3 James Chesebro highlights social constructionism as one of the hallmarks of Burke's dramatism: "For Burke, the realm of symbol-using is unique to the human being. Symbol-using is a solely conventional, arbitrary, and social process. It allows human beings to become self-conscious, create motives independently of physical phenomena, and ultimately to create social constructions of reality."4 Dennis Ciesielski argues that Burke's "terministic screens" define "base reality into truth-systems unique to each respective discourse community and impl[y] a neo-pragmatic, social constructionist pattern for the making of meaning."5 Finally, Robert Wess characterizes Burke's entire career as the evolution from a materialist, biological-essentialist view of the human self to a social constructionist view.6Generally speaking, "social constructionism" is a metaphor that attempts to capture the way Burke viewed the nature of the world and the function of language therein. It suggests that symbols, terms, and language form the building blocks, the bricks and mortar, of the structures of our collective life. We employ symbols that construct our social realities, similar to the way a contractor employs the materials and labor that construct a house. Consequently, the realities we face are not inherent in nature but are built up discursively and can therefore be reconstructed as we alter our discursive practices.7The social construction metaphor positions Burke's philosophical out-look in terms that are familiar to us, though not necessarily familiar to him. That is to say, the label of social constructionist is recent, and it comes not from Burke's work but from intellectual developments after he wrote the bulk of his corpus.8 We apply it to him retroactively, meshing together his intellectual milieu with our own. And as Ian Hacking reminds us, "The phrase has become code. If you use it favorably, you deem yourself rather radical. If you trash the phrase, you declare that you are rational, reasonable, and respectable."9Labeling Burke a social constructionist wraps his thought in a current metaphor, merging his perspective with a vocabulary that was not part of his project. While such a merger is not necessarily a bad thing—to some degree the process is inevitable10—a certain danger... (shrink)

Twenty years ago, even ten years ago, one might have begun an essay about the intersection of pragmatism and rhetoric by lamenting the dearth of scholarship on the subject. Today, no such lamentations are needed. The past decade has seen an explosion of interest in the way pragmatism and rhetoric can profitably inform each other. Offering everything from formulations of pragmatist rhetorical theory (Mailloux 1998; Schollmeier 2002; Danisch 2007; Crick 2010) to explorations of pragmatist methodology in the study of rhetorical (...) texts (Stroud 2009a; Stroud 2010) to analyses of what individual pragmatists have contributed to the history of rhetoric (Asen and Brouwer 2003; Asen 2003; Finnegan 2003; Greene 2003; Stob .. (shrink)

Virtually all philosophers agree that for a belief to be epistemically justified, it must satisfy certain conditions. Perhaps it must be supported by evidence. Or perhaps it must be reliably formed. Or perhaps there are some other "good-making" features it must have. But does a belief's justification also require some sort of awareness of its good-making features? The answer to this question has been hotly contested in contemporary epistemology, creating a deep divide among its practitioners. Internalists, who tend to focus (...) on scientific or theoretical beliefs as the ideal, insist that such awareness is required for justification. Externalists, who think children's ordinary beliefs in obvious facts are paradigm cases of justified belief, say it isn't required. Michael Bergmann's book offers a decisive refutation of internalism and a sustained defense of externalism. (shrink)

Externalist theories of justification create the possibility of cases in which everything appears to one relevantly similar with respect to two propositions, yet one proposition is justified while the other is not. Internalists find this difficult to accept, because it seems irrational in such a case to affirm one proposition and not the other. The underlying internalist intuition supports a specific internalist theory, Phenomenal Conservatism, on which epistemic justification is conferred by appearances.

At the University of Sheffield during 2011 and 2012, a leading group of philosophers, psychologists, and others gathered to explore the nature and significance of implicit bias. The two volumes of Implicit Bias and Philosophy emerge from these workshops. Each volume philosophically examines core areas of psychological research on implicit bias as well as the ramifications of implicit bias for core areas of philosophy. Volume I: Metaphysics and Epistemology is comprised of two parts: “The Nature of Implicit Attitudes, Implicit Bias, (...) and Stereotype Threat,” and “Skepticism, Social Knowledge, and Rationality.” The first part contains chapters examining the relationship between implicit attitudes and “dual process” models of the mind; the role of affect in the formation and change of implicit associations; the unity (or disunity) of implicit attitudes; whether implicit biases are mental states at all; and whether performances on stereotype-relevant tasks are automatic and unconscious or intentional and strategic. The second part contains chapters examining implicit bias and skepticism; the effects of implicit bias on scientific research; the accessibility of social stereotypes in epistemic environments; the effects of implicit bias on the self-perception of members of stigmatized social groups as rational agents; the role of gender stereotypes in philosophy; and the role of heuristics in biased reasoning. (shrink)

Over the last decades, curator Nicolas Bourriaud has drawn significant inspiration for his writings on contemporary art from the theories of the Situationist International (SI), an avant-garde group in existence from 1957 until 1972. Mischaracterizing the SI’s concepts of the situation, détournement, and the dérive, Bourriaud claims to update these concepts with concepts of his own: relational aesthetics, detourage, and radicant aesthetics. This article identifies such misrepresentations and highlights the differences between Bourriaud’s paradigms and those of the SI. This contextual (...) restitution also provides an opportunity to examine Bourriaud’s general methodology of substituting conceptual formalism for art historical theory. Bourriaud’s publications repeatedly claim a historical materialist perspective on aesthetics, only to eventually eliminate this perspective; his use and abuse of Situationist theory is the foundational example for this pattern. More than the artworks showcased in Bourriaud’s exhibitions and referenced in his publications, his artistic paradigms describe and delineate his own philosophical sleight of hand. (shrink)

During his long career, John Dewey produced an almost endless number of pages of dense philosophical prose, giving those interested in his work plenty to do. Even scholars of rhetoric have found a host of reasons to return to Dewey’s corpus, despite the fact that Dewey himself seemed, at best, uninterested in rhetoric. Two recent works—Robert Danisch’s Pragmatism, Democracy, and the Necessity of Rhetoric and Nathan Crick’s Democracy and Rhetoric: John Dewey on the Arts of Becoming—have already fruitfully mined Dewey’s (...) writings for insights on how pragmatist philosophy intersects with the rhetorical tradition. Now comes Scott Stroud’s John Dewey and the Artful Life. Like Danisch and Crick, Stroud explores the nexus .. (shrink)

In this engaging and spirited text, Michael Lynch argues that truth does matter, in both our personal and political lives. He explains that the growing cynicism over truth stems in large part from our confusion over what truth is.

Dignity plays a central role in current thinking about law and human rights, but there is sharp disagreement about its meaning. Combining conceptual precision with a broad historical background, Michael Rosen puts these controversies in context and offers a novel, constructive proposal. “Penetrating and sprightly...Rosen rightly emphasizes the centrality of Catholicism in the modern history of human dignity. His command of the history is impressive...Rosen is a wonderful guide to the recent German constitutional thinking about human dignity...[Rosen] is in (...) general an urbane and witty companion, achieving his aim of accessibly written philosophy.” —Samuel Moyn, The Nation “[An] elegant, interesting and lucid exploration of the concept of dignity...Drawing on classical, liberal and Catholic traditions, Rosen hopes to rehabilitate dignity to its rightful place near the centre of moral thought...Rosen's admirable book deserves wide attention from political theorists, jurisprudes and political philosophers.” —Simon Blackburn, Times Higher Education “Dignity deserves to be widely read, not only for its intrinsic interest, but also as a corrective to the habit of discussing such topics in abstraction from their social context. Whether or not one agrees with Rosen's arguments, there can be no doubt he has widened our horizons.” —Rae Langton, Times Literary Supplement. (shrink)

For Situationist, theorist and film-maker Guy Debord, the aerial view reproduced the falsely objective world-view he called ‘the spectacle’. To counter its myth of an infinitely expandable, omniscient perspective, Debord focused on reducing views from above to ‘derisory documents’ of the social and the environmental through détournement in the two films he made while the Situationist International was in existence. The films engage critically with aerial photography as a hegemonic mode of indexical media, with the aerial view’s application as information (...) image and ornament, and with the formal phenomenon of ciné-mapping. This analysis suggests that the détournement Debord performs in and across these films can be best conceptualized as a critical optic that constitutes a practice of seeing, a mode of reception and a call to action in the social space beyond its aesthetic employ. As such, the optic of détournement is the contestational counterpart to the optic of the aerial view. This remains the case despite the contemporary complexity of photographic views from above and their increased abstraction of social agents and spaces. An alternative to the testimonial function of embodied photographic views, détournement as optic represents an indexical civil contract founded upon representational inadequacy. (shrink)

Eloquence & professionalism in the nineteenth century -- Engaging science and society -- Talking to teachers -- Speaking up for spirits -- Religious experience & the appeals of intellectual populism -- Empowering a pragmatic public.

edition (unseen), $12.95. traditions, bringing into being new modes of understanding. Paper Anthropology, and particularly ethnography, is torn between two quests, one to capture the diversity of social life and the other to discover universal principles structuring that diversity. Jackson examines these quests within the context of ethnographic fieldwork, focusing on the relationship between ethnographers and the people they study. He is concerned with defining the anthropological project as something more than the projection of the anthropologist's traditions and concerns onto (...) an alien culture. Rather, he would have the project open a genuine dialogue between people from different cultures or Annotation copyrighted by Book News, Inc., Portland, OR. (shrink)

At the heart of ethics reside the concepts of good and bad; they are at work when we assess whether a person is virtuous or vicious, an act right or wrong, a decision defensible or indefensible, a goal desirable or undesirable. But there are many varieties of goodness and badness. At their core lie intrinsic goodness and badness, the sort of value that something has for its own sake. It is in virtue of intrinsic value that other types of value (...) may be understood, and hence that we can begin to come to terms with questions of virtue and vice, right and wrong, and so on. This book investigates the nature of intrinsic value: just what it is for something to be valuable for its own sake, just what sort of thing can have such value, just how such a value is to be computed. In the final chapter, the fruits of this investigation are applied to a discussion of pleasure, pain, and displeasure and also of moral virtue and vice, in order to determine just what value lies within these phenomena. (shrink)

While philosophers hold that it is patently absurd to blame robots or hold them morally responsible [1], a series of recent empirical studies suggest that people do ascribe blame to AI systems and robots in certain contexts [2]. This is disconcerting: Blame might be shifted from the owners, users or designers of AI systems to the systems themselves, leading to the diminished accountability of the responsible human agents [3]. In this paper, we explore one of the potential underlying reasons for (...) robot blame, namely the folk's willingness to ascribe inculpating mental states or "mens rea" to robots. In a vignette-based experiment (N=513), we presented participants with a situation in which an agent knowingly runs the risk of bringing about substantial harm. We manipulated agent type (human v. group agent v. AI-driven robot) and outcome (neutral v. bad), and measured both moral judgment (wrongness of the action and blameworthiness of the agent) and mental states attributed to the agent (recklessness and the desire to inflict harm). We found that (i) judgments of wrongness and blame were relatively similar across agent types, possibly because (ii) attributions of mental states were, as suspected, similar across agent types. This raised the question - also explored in the experiment - whether people attribute knowledge and desire to robots in a merely metaphorical way (e.g., the robot "knew" rather than really knew). However, (iii), according to our data people were unwilling to downgrade to mens rea in a merely metaphorical sense when given the chance. Finally, (iv), we report a surprising and novel finding, which we call the inverse outcome effect on robot blame: People were less willing to blame artificial agents for bad outcomes than for neutral outcomes. This suggests that they are implicitly aware of the dangers of overattributing blame to robots when harm comes to pass, such as inappropriately letting the responsible human agent off the moral hook. (shrink)

In previous work I have argued against internalism by means of a dilemma intended to force all internalists to accept one of two undesirable options: either their internalism is unmotivated or it is saddled with vicious regress problems. Recently it has been argued that Phenomenal Conservatism—a theory of justification according to which justification depends on seemings—is a kind of internalism that can escape this dilemma. In this paper, I argue that Phenomenal Conservatism cannot escape my dilemma for internalism. In order (...) to do this, it is helpful to get clear on what Phenomenal Conservatism is saying, and for that reason I begin, in section I, by examining in some detail what seemings are. I then argue, in the remainder of the paper, that, whichever horn of the dilemma for internalism they take, Phenomenal Conservatives are in trouble. (shrink)

Can an ugly experiment be a good experiment? Philosophers have identified many beautiful experiments and explored ways in which their beauty might be connected to their epistemic value. In contrast, the present chapter seeks out (and celebrates) ugly experiments. Among the ugliest are those being designed by AI algorithms. Interestingly, in the contexts where such experiments tend to be deployed, low aesthetic value correlates with high epistemic value. In other words, ugly experiments can be good. Given this, we should conclude (...) that beauty is not generally necessary or sufficient for epistemic value, and increasing beauty will not generally tend to increase epistemic value. (shrink)