Classic text considersgeneral theory of computability, computable functions, operations on computable functions, Turing machines self-applied, unsolvable decision problems, applications of general theory, mathematical logic, Kleene hierarchy, computable functionals, classification of unsolvable decision problems and more.

"A valuable collection both for original source material as well as historical formulations of current problems."-- The Review of Metaphysics "Much more than a mere collection of papers . . . a valuable addition to the literature."-- Mathematics of Computation An anthology of fundamental papers on undecidability and unsolvability by major figures in the field, this classic reference opens with Godel's landmark 1931 paper demonstrating that systems of logic cannot admit proofs of all true assertions of arithmetic. Subsequent papers by (...) Godel, Church, Turing, and Post single out the class of recursive functions as computable by finite algorithms. Additional papers by Church, Turing, and Post cover unsolvable problems from the theory of abstract computing machines, mathematical logic, and algebra, and material by Kleene and Post includes initiation of the classification theory of unsolvable problems. Suitable for graduate and undergraduate courses. 1965 ed. (shrink)

Based on his theory of animalrights, Regan concludes that humans are morallyobligated to consume a vegetarian or vegandiet. When it was pointed out to him that evena vegan diet results in the loss of manyanimals of the field, he said that while thatmay be true, we are still obligated to consumea vegetarian/vegan diet because in total itwould cause the least harm to animals (LeastHarm Principle, or LHP) as compared to currentagriculture. But is that conclusion valid? Isit possible that some other (...) agriculturalproduction alternatives may result in leastharm to animals? An examination of thisquestion shows that the LHP may actually bebetter served using food production systemsthat include both plant-based agriculture and aforage-ruminant-based agriculture as comparedto a strict plant-based (vegan) system. Perhapswe are morally obligated to consume a dietcontaining both plants and ruminant(particularly cattle) animal products. (shrink)

Moral realists often assume that folk intuitions are predominantly realist, and they argue that this places the burden of proof on antirealists. More broadly, appeals to intuition in metaethics typically assume that folk judgments are generally consistent across individuals, such that they are at least predominantly something, if not realist. A substantial body of empirical work on moral objectivism has investigated these assumptions, but findings remain inconclusive due to methodological limitations. Objectivist judgments classify individuals into broad categories of realism and (...) antirealism, but they do not address more specific conflicts in the metaethical literature between different types of realism and antirealism, such as between nonnaturalism and divine command theory, or between noncognitivism and error theory. Further, the data currently show that the folk are objectivists about some moral claims but not others, raising questions that have not been addressed in previous studies about how much of the moral domain is judged to be objective, and about how endorsements of different types of realism and antirealism are distributed among different types of moral claims. Here, I present a new survey that addresses these limitations. The results challenge both of the empirical assumptions identified above, with important implications for metaethical methodology. (shrink)

Conflicts of interest pose special problems for the professions. Even the appearance of a conflict of interest can undermine essential trust between professional and public. This volume is a comprehensive and accessible guide to the ramifications and problems associated with important issue. It contains fifteen new essays by noted scholars and covers topics in law, medicine, journalism, engineering, financial services, and others.

Most of us believe that partiality applies in a broad range of relationships. One relationship on which there is much disagreement is co-nationality. Some writers argue that co-national partiality is not justified in certain cases, like killing in war, since killing in defense of co-nationals is intuitively impermissible in other contexts. I argue that this approach overlooks an important structural feature of partiality—namely, that its scope is sometimes restricted. In this essay, I show how some relationships that generate reasons of (...) partiality are restricted in scope—that is, they generate reasons within particular contexts or with respect to particular goods. I then argue that co-national partiality is scope restricted. I then show how this fact helps proponents of co-national partiality overcome the aforementioned objection to its application in cases like war. (shrink)

Honoring a living will typically involves treating an incompetent patient in accord with preferences she once had, but whose objects she can no longer understand. How do we respect her precedent autonomy by giving her what she used to want? There is a similar problem with subsequent consent: How can we justify interfering with someone''s autonomy on the grounds that she will later consent to the interference, if she refuses now?Both problems arise on the assumption that, to respect someone''s autonomy, (...) any preferences we respect must be among that person''s current preferences. I argue that this is not always true. Just as we can celebrate an event long after it happens, so can we respect someone''s wishes long before or after she has that wish. In the contexts of precedent autonomy and subsequent consent, the wishes are often preferences about which of two other, conflicting preferences to satisfy. When someone has two conflicting preferences, and a third preference on how to resolve that conflict, to respect his autonomy we must respect that third preference. People with declining competence may have a resolution preference earlier, favoring the earlier conflicting preference (precedent autonomy), whereas those with rising competence may have it later, favoring the later conflicting preference (subsequent consent). To respect autonomy in such cases we must respect not a current, but a former or later preference. (shrink)

As the central figure of the third generation of the Kyoto School of modern Japanese philosophy, UEDA Shizuteru 上田閑照 has not only followed in the footsteps of his predecessors, NISHIDA Kitarō 西田幾多郎 and NISHITANI Keiji 西谷啓治, but has taken several strides forward in their shared pursuit of what can be called a “philosophy of Zen.” The “of” in this phrase should be understood as a “double genitive,” that is, in both its objective and subjective senses. Ueda not only philosophizes about (...) Zen, he also philosophizes from Zen. Like Nishida and Nishitani before him, he has devoted himself to the practice of Zen as well as to the study of Western philosophy. However, what does it mean to speak, much less philosophize, about Zen experience? Ueda has in fact concentrated much of his attention on questions concerning the relation between Zen and philosophy or, more generally, between experience and language. Any development of a “philosophy of Zen,” Ueda recognizes, must begin with the question of what it means to “speak of experience.” What does it mean to express, that is, to speak from and about experience? This question has been at the heart of Ueda’s philosophical path from the beginning. His many works on this topic include a seminal early essay “Zen and Language,” later re-titled “The Language of Zen”, articles written in German including “Awakening in Zen Buddhism as a Word-Event”, and a recent article, “Language in a Twofold World,” which Ueda put together to represent his thought in a major anthology of Japanese philosophy. In these and other works, Ueda convincingly demonstrates that the question of the relation between language and experience has always been a pivotal issue for the Zen tradition itself. He also shows how this tradition can help us, in the wake of the “linguistic turn” in philosophy, to return afresh to this fundamental question. (shrink)

This book focuses on the significance of the body in contemporary feminist scholarship. Whether the body is treated as biological bedrock or subversive metaphor, it is implicated in the cultural and historical construction of sexual difference as well as asymmetrical power relations. The contributors to this volume examine the role of the body as socially shaped and historically colonized territory and as the focus of individual womenÆs struggles for autonomy and self-determination. They also analyze its centrality to the feminist critique (...) of male-stream science as dualistic, distanced, and decontextualized. While the body has become a "hot item" in contemporary social theory and research, the renewed interest has received a mixed reaction from feminists. The body may be back, but the "new" body theory often proves to be just as disembodied as it ever was. The body revival seems to be less an attempt to re-embody masculinist science than just another expression of the same condition that evoked the feminist critique in the first place: a flight from femininity and everything that is associated with it in Western culture. Drawing on insights from contemporary feminist theories of gender and power, this book offers a timely critical appraisal of the recent "body revival." Embodied Practices not only sets an agenda for research about the body, but for an embodied perspective on the body as well. It will be a valuable and thought-provoking resource for students of womenÆs studies, social theory, cultural studies, and medical sociology. (shrink)

The first code of professional ethics must: (1)be a code of ethics; (2) apply to members of a profession; (3) apply to allmembers of that profession; and (4) apply only to members of that profession. The value of these criteria depends on how we define “code”, “ethics”, and “profession”, terms the literature on professions has defined in many ways. This paper applies one set of definitions of “code”, “ethics”, and “profession” to a part of what we now know of the (...) history of professions, there by illustrating how the choice of definition can alter substantially both our answer to the question of which came first and (more importantly) our understanding of professional codes (and the professions that adopt them). Because most who write on codes of professional ethics seem to take for granted that physicians produced the first professional code, whether the Hippocratic Oath, Percival’s Medical Ethics, the 1847 Code of Ethicsof the American Medical Association (AMA), or some other document, I focus my discussion on these codes. (shrink)

Critique of J.J. Thomson's well-known defense of abortion. Tries to show that Thomson is wrong that abortion is a violation of the fetus's right to life because there is an important difference between the way the fetus is dependent on the pregnant woman and the way the patient is dependent on the violinist.

Since Henry Shue’s classic 1978 paper on torture, the “ticking-bomb case” has seemed to demonstrate that torture is morally justified in some moral emergencies (even if not as an institution). After presenting an analysis of torture as such and an explanation of why it, and anything much like it, is morally wrong, I argue that the ticking-bomb case demonstrates nothing at all—for at least three reasons. First, it is an appeal to intuition. The intuition is not as widely shared as (...) necessary to constitute the required demonstration. Second, the intuition is not as reliable as necessary for such a demonstration. We lack the experience that would vouch for it. And, third, Shue’s own discussion suggests that what we are intuiting (if we share Shue’s intuition) is an excuse rather than a justification. (shrink)

Feminist scholars have increasingly expressed their worries about the depoliticization of intersectionality since it has travelled from its point of origin in US Black feminist theory to the shores of Europe. They have argued that the subject for which the theory was intended has been displaced, that Black feminists have been excluded from the discussion, and that white European feminists have usurped all the credit for intersectionality as theory. Intersectionality has been transformed into a product of the neoliberal academy rather (...) than the helpmeet for social justice it was meant to be. This article explores three of the bones of contention in these debates about intersectionality and its travels. The author argues that they rest on notions of ownership that, while understandable, are untenable and, ultimately, counterproductive. A case will be made for taking a less proprietary stance toward critical theories and instead treating the travels of intersectionality as an occasion for dialogue rather than a contest over ownership. (shrink)

It is widely held that there is a legal right to privacy that plays such a central role in a number of important US Supreme Court decisions. There is however a great deal of dispute about whether there is a moral right to privacy and if there is, what grounds the right. Before this can be determined, we must be clear about the nature of privacy, something that is not clearly understood and that, as we shall see, is often confused (...) with the right to privacy. I shall begin with a critical discussion of various views about the nature of privacy. I shall then present my own account, and show how it meets the objections that have been raised against other views. Lastly, I shall close with a discussion about whether privacy is a moral right. (shrink)

This book is a critical introduction to contemporary French philosopher Jacques Rancière. It is the first introduction in any language to cover all of his major work and offers an accessible presentation and searching evaluation of his significant contributions to the fields of politics, pedagogy, history, literature, film theory and aesthetics. This book traces the emergence of Rancière’s thought over the last forty-five years and situates it in the diverse intellectual contexts in which it intervenes. Beginning with his egalitarian critique (...) of his former teacher Louis Althusser, the book tracks the subsequent elaboration of Rancière’s highly original conception of equality. This approach reveals that a grasp of his early archival and historiographical work is vital for a full understanding both of his later politics and his ongoing investigation of art and aesthetics. Along the way, this book explains and analyses key terms in Rancière’s very distinctive philosophical lexicon, including the ‘police’ order, ‘disagreement’, ‘political subjectivation’, ‘literarity’, the ‘part which has no part’, the ‘regimes of art’ and ‘the distribution of the sensory’. This book argues that Rancière’s work sets a new standard in contestatory critique and concludes by reflecting on the philosophical and policy implications of his singular project. (shrink)

This book originated at a small and informal workshop held in December of 1992 in Idyllwild, a relatively secluded resort village situated amid forests in the ...

There is a distinction between being afraid and being afraid that something is the case. Kathy may be afraid that it will rain without being afraid, and may be afraid without being afraid that it will rain. We shall say that the distinction is between experiential and propositional fear. To be afraid is to experience fear, to be in a state of fear. The state takes many forms, such as fright, terror, and dread. To be afraid that something is the (...) case is to have a certain propositional attitude. We may have reasons for fearing, or being fearful, that it is. My goal is to explain what it means to experience fear. I shall argue that experiential fear can be defined in terms of propositional fear. The basic idea is that fear is experienced when an occurrent propositional fear of harm causes involuntary arousal and unhappiness in a direct way. The degree of fear experienced is the extent of involuntary arousal attributable to the subject's propositional fear. We shall see how this definition accounts for the similarities and differences between fear and the related concepts of hope and anxiety. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Addressing Alterity:Rhetoric, Hermeneutics, and the Nonappropriative RelationDiane DavisTeaching is not reducible to maieutics; it comes from the exterior and brings me more than I contain.—Emmanuel Levinas, Totality and InfinityThere is always the matter of a surplus that comes from an elsewhere and that can no more be assimilated by me, than it can domesticate itself in me. A teaching that may part ways with Heidegger's motif of our being (...) able to learn only what we already understand—when does learning take place? what do we already understand?—the Conversation belongs, as ethical relation, to the effort of thinking the infinite, the transcendent, the Stranger. None of this amounts to thinking an object.—Avital Ronell, DictationsFrom Rhetorical Power to Reception Histories Steven Mailloux has brilliantly performed and explicated a "rhetorical hermeneutics" that demonstrates the "practical inseparability of interpretation and language use and thus of the discourses that theorize those practices, hermeneutics and rhetoric" (1998, 3). Many rhetoricians have challenged the specifics of Mailloux's various arguments and have more generally objected that "rhetorical hermeneutics" leans too far toward the hermeneutical, reducing rhetoric to an analytic or critical art and giving its productive (political) function the squeeze.1 Yet within these lively debates, very few have challenged his basic premise that rhetoric and hermeneutics are inextricably intertwined: the question has not been whether they are indissociable but which side of the production-reception coin rhetorical studies ought to emphasize.2 Michael Leff, for example, flipped Mailloux's adjective-noun relation to spotlight production, promoting a "hermeneutical rhetoric" that focuses more on political than literary texts; nonetheless, he agrees that "all interpretive work involves participation in a rhetorical exchange, and that every rhetorical exchange involves some interpretive work" (1997, 197-98). [End Page 191] Rosa Eberly goes further in Citizen Critics, offering a hermeneutical rhetoric that is less interested in "already-written discourses" than in spotlighting "rhetoric's power as an art productive of discourses and subjectivities for the present and the future" (2000, 34). Yet Eberly, too, affirms Mailloux's basic premise, which was nudged in the direction of conflation in the introduction to the 1997 collection Rhetoric and Hermeneutics in Our Time, in which the editors, Walter Jost and Michael Hyde note in passing that their title can "be understood as virtually tautological."And there is of course no doubt that rhetoric has a hermeneutic dimension; or, more carefully, that rhetoric constitutes the hermeneutic dimension. If "hermeneutics" indicates "the art of understanding," as Friedrich Schleirmacher wanted, then interpretation clearly depends upon production.3 "Rhetoric not only has its place within the sphere of objects surveyed by hermeneutics," as Werner Hamacher puts it, "but also constitutes an integral component of every hermeneutic operation. Every step in an interpretation corresponds to a rhetorical—or grammatical—figure" (1996, 70). Put more bluntly: intelligibility, including self-intelligibility, is a tropological product; cognition itself is a trope that can in no way be secured. Hermeneutics—as it's being used here—is completely dependent on, even absorbed by, rhetoric.4 I have no problem with this. Nor with Mailloux's suggestion that the reverse is also true:In some ways rhetoric and interpretation are practical forms of the same extended human activity: Rhetoric is based on interpretation; interpretation is communicated through rhetoric. Furthermore, as a reflection on practice, hermeneutics and rhetorical theory are mutually defining fields: hermeneutics is the rhetoric of establishing meaning, and rhetoric the hermeneutics of problematic linguistic situations.(Mailloux 1998, 4)I don't disagree: As the production and appropriation of meaning, rhetoric and hermeneutics are an indissociable team; together, they complete understanding's circle. I take this as a given.However, I want to suggest that there is also a non-hermeneutical dimension of rhetoric that has nothing to do with meaning-making, with offering up significations to comprehension. This dimension is reducible neither to figuration nor to what typically goes by the name persuasion; it is devoted to a certain reception, but not to the appropriation of meaning. Preceding and exceeding all hermeneutic interpretation, it deals not in signified meaning but in the address itself, in the exposure to the other; it deals not... (shrink)

Judgment is central to engineering, medicine, the sciences and many other practical activities. For example, one who otherwise knows what engineers know but lacks engineering judgment may be an expert of sorts, a handy resource much like a reference book or database, but cannot be a competent engineer. Though often overlooked or at least passed over in silence, the central place of judgment in engineering, the sciences, and the like should be obvious once pointed out. It is important here because (...) it helps to explain where ethics fits into these disciplines. There is no good engineering, no good science, and so on without good judgment and no good judgment in these disciplines without ethics. Doing even a minimally decent job of teaching one of these disciplines necessarily includes teaching its ethics; teaching the ethics is teaching the discipline (or at least a large part of it). (shrink)

Corporations have scrambled to bring to market products positioned and advertised as addressing the needs of the environmentally-conscious consumer. The vast majority of claims presented in support of these products are best described, however, as confused, misleading or outright illegal. Ethical considerations have not yet been integrated into environmental marketing, and as a result, long-term harm on both the individual and societal level may result. A framework for reversing this trend is presented. It identifies the sequence of actions necessary for (...) the development and communication of ethical environmental marketing claims. The sequence is based upon two aspects of ethical theory: moral style and normative behavior. Specific implications for marketers'' actions at each stage in the sequence of framework development are also discussed. (shrink)

In this groundbreaking work, Christa Davis Acampora offers a profound rethinking of Friedrich Nietzsche’s crucial notion of the agon. Analyzing an impressive array of primary and secondary sources and synthesizing decades of Nietzsche scholarship, she shows how the agon, or contest, organized core areas of Nietzsche’s philosophy, providing a new appreciation of the subtleties of his notorious views about power. By focusing so intensely on this particular guiding interest, she offers an exciting, original vantage from which to view this (...) iconic thinker: Contesting Nietzsche. Though existence—viewed through the lens of Nietzsche’s agon—is fraught with struggle, Acampora illuminates what Nietzsche recognized as the agon’s generative benefits. It imbues the human experience with significance, meaning, and value. Analyzing Nietzsche’s elaborations of agonism—his remarks on types of contests, qualities of contestants, and the conditions in which either may thrive or deteriorate—she demonstrates how much the agon shaped his philosophical projects and critical assessments of others. The agon led him from one set of concerns to the next, from aesthetics to metaphysics to ethics to psychology, via Homer, Socrates, Saint Paul, and Wagner. In showing how one obsession catalyzed so many diverse interests, Contesting Nietzsche sheds fundamentally new light on some of this philosopher’s most difficult and paradoxical ideas. (shrink)

This essay offers an extensive rehabilitation and reappraisal of the concept of childhood innocence as a means of testing the boundaries of some prevailing constructions of childhood. It excavates in detail some of the lost histories of innocence in order to show that these are more diverse and more complex than established and pejorative assessments of them conventionally suggest. Recovering, in particular, the forgotten pedigree of the Romantic account of the innocence of childhood underlines its depth and furnishes an enriched (...) understanding of its critical role in the coming of mass education––both as a catalyst of social change and as an alternative measure of the child-centeredness of the institutions of public education. Now largely and residually confined to the inheritance of nursery education, the concept of childhood innocence, and the wider Romantic project of which it is an element, can help question the assumptions underpinning modern, competence-centred philosophies of childhood. (shrink)

Though this paper is mostly about a sense of “profession” common in much of the West, it explains how the term might apply in any country (especially how the profession of engineering differs from the function, discipline, and occupation of engineering). To do that, I have to explain the connection between “profession” (in my preferred sense) and another hard-to-translate term, “code of ethics” (in the sense it has in the expression “code of engineering ethics”). To understand engineering (or any other (...) occupation) as a profession is to adopt a certain conception of it, one neither old nor (yet) universal. With that conception in hand, it should be possible for social science to answer the question posed in the title. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:President’s Council on BioethicsEdmund D. Pellegrino (bio) and F. Daniel Davis (bio)Approximately two weeks before what was to have been its final meeting, the White House dissolved the President’s Council on Bioethics by terminating the appointments of its 18 members. The letters of dismissal, dated 10 June 2009, informed the members that their service on the Council would end with the close of business the next day.The Council’s (...) term was set to expire on 30 September 2009. After President Obama’s election in November and during the transition, we were advised to proceed on the assumption that the Council would be permitted to cease on that date. Reasons for the abrupt move to disband the Council are unknown. We have accepted the fact that we Council members served at the pleasure of the President and that he simply exercised his rightful prerogative. No explanation is therefore required.Some observers have speculated that the action was retaliatory. They related to the fact that several members of the Council disagreed with the President’s stem cell policy in a signed statement published in the Hastings Center’s Bioethics Forum. Others have speculated that the move was pre-emptive. At its final meeting, scheduled for 25–26 June, the Council was set to sign-off on two of its final publications. One was a comprehensive report on the ethics of organ transplantation, and the other a white paper entitled Health Care and the Common Good. The aim was immediately to release the latter as a contribution to the intensifying debate about health care reform. Health Care and the Common Good could well have aided rather than impeded the President’s drive to better control health care costs and achieve universal coverage. The Council report attempted to ground both goals in the ethical framework of, as the title indicates, the common good of all Americans.In his letter terminating the members’ appointments, Assistant to the President for Presidential Personnel Don Gips said that the President “recognizes the values of having a commission of experts in bioethical issues to provide objective and non-ideological bioethics advice to his administration.” Gips went on to say that the President is “currently rethinking the purposes and goals of such a bioethics commission, and is carefully considering a revitalized mission and mandate.” And, [End Page 309] responding to media enquiries, White House press officer Reid Cherlin explained that the President’s Council was terminated because it was a “philosophically leaning advisory group” and, according to a New York Times account by Nicholas Wade, “because it favored discussion over developing a shared consensus.” As for the ultimate outcome of the President’s “rethinking,” Cherlin indicated that President Obama will appoint a new commission with the mandate of offering “practical policy options” in bioethics.In the light of our experiences with the Council, we leave it with hopes that certain questions of national importance will be addressed. In light of the nature of federal advisory commissions, what is or are the proper roles of a national bioethics commission? If the aim is to provide advice and counsel to the President or, perhaps to the U. S. Congress, is that advice best rendered as a group consensus or as an in-depth exploration of the inevitably conflicting ethical perspectives on a given issue? How should such a commission be constituted—with what sorts of individuals? And what is the nature of the expertise that they individually and collectively bring to the commission’s functions? If the commission is to promote public debate and discussion, how exactly should it go about that task? And how is the efficacy of a commission to be assessed? Such questions inevitably lead us deep into contested territory, as the experience of this Council has shown: into the intersections of politics, religion, and science and into the relations between practice and theory—between policy and what some seem to deride as “philosophy.” Indeed, policy without an underlying philosophy is an edifice without a foundation; philosophy without policy is a foundation without an edifice.At the last meeting of the Council in March 2009, we launched a discussion of these questions with the... (shrink)

I shall conclude with a methodological moral. I have tried to show that there are several fundamentally different kinds of fear. One is a pure propositional attitude, one is partially a bodily state, and one is a relation between a person and a nonpropositional object. Other emotions come in similar varieties, such as hope and happiness, but with significant differences. The state of happiness, for example, does not entail any particular bodily state or feeling. So one lesson is this: it (...) is hard to generalize about “the emotions.” Further detailed, analytical studies of particular emotions are needed before a “general theory of the emotions” can be fruitfully attempted. (shrink)

The worst possible way to resolve this issue is to leave it up to individual choice. There is no known social good coming from the conquest of death (Bailey, 1999). - Daniel Callahan Dramatically extending the human lifespan seems increasingly possible. Many bioethicists object that life-extension will have Malthusian consequences as new Methuselahs accumulate, generation by generation. I argue for a Life-Years Response to the Malthusian Objection. If even a minority of each generation chooses life-extension, denying it to them deprives (...) them of many years of extra life, and their total extra life-years are likely to exceed the total life-years of a majority who do not want life-extension. This is a greater harm to those who want extended life than the Malthusian harms to those who refuse extended life, both because losing an extra year of life is worse than enduring a year of Malthusian conditions, and because the would-be Methuselahs have more life-years at stake. Therefore, even if life-extension seems likely to cause severe overcrowding and resource shortages, that threat is not sufficient to justify society in restricting the development or availability of life-extension. (shrink)

Under a grant from the National Science Foundation, the authors (and others) undertook to integrate ethics into graduate engineering classes at three universities—and to assess success in a way allowing comparison across classes (and institutions). This paper describes the attempt to carry out that assessment. Standard methods of assessment turned out to demand too much class time. Under pressure from instructors, the authors developed an alternative method that is both specific in content to individual classes and allows comparison across classes. (...) Results are statistically significant for ethical sensitivity and knowledge. They show measurable improvement in a single semester. (shrink)

: Because I reject the notion that physical characteristics constitute cultural membership, I argue that, even if the claim were persuasive that deafness is a culture rather than a disability, there is no reason to fault hearing parents who choose cochlear implants for their deaf children.