In 1962, the philosopher Richard Taylor used six commonly accepted presuppositions to imply that human beings have no control over the future. David Foster Wallace not only took issue with Taylor's method, which, according to him, scrambled the relations of logic, language, and the physical world, but also noted a semantic trick at the heart of Taylor's argument. _Fate, Time, and Language_ presents Wallace's brilliant critique of Taylor's work. Written long before the publication of his fiction (...) and essays, Wallace's thesis reveals his great skepticism of abstract thinking made to function as a negation of something more genuine and real. He was especially suspicious of certain paradigms of thought-the cerebral aestheticism of modernism, the clever gimmickry of postmodernism-that abandoned "the very old traditional human verities that have to do with spirituality and emotion and community." As Wallace rises to meet the challenge to free will presented by Taylor, we witness the developing perspective of this major novelist, along with his struggle to establish solid logical ground for his convictions. This volume, edited by Steven M. Cahn and Maureen Eckert, reproduces Taylor's original article and other works on fatalism cited by Wallace. James Ryerson's introduction connects Wallace's early philosophical work to the themes and explorations of his later fiction, and Jay Garfield supplies a critical biographical epilogue. (shrink)

This chapter presents David Foster Wallace's views about three positions regarding the good life—ironism, hedonism, and narrative theories. Ironism involves distancing oneself from everything one says or does, and putting on Wallace's so-called “mask of ennui.” Wallace said that the notion appeals to ironists because it insulates them from criticism. However, he reiterated that ironists can be criticized for failing to value anything. Hedonism states that a good life consists in pleasure. Wallace rejected such (...) a notion, doubting that pleasure could play a fundamental role in the good life. Lastly, narrative theories characterize the good life by fidelity to a unified narrative -- a systematic story about one's life, composed of a set of ends or principles according to which one lives. Wallace believed that these theories turn people into spectators, rather than the participants in their own lives. (shrink)

David Foster Wallace was genuinely troubled by what he perceived to be a serious incongruity in the mental lives of elite athletes. To perform with grace and beauty, elite athletes must be ‘geniuses,’ yet in conversation and prose these same athletes often exhibit such vapidity and banality that he was tempted to simply write them off as unintelligent or worse. In response to this puzzle, Wallace developed different philosophical conceptions of the elite athlete aimed at bridging (...) the gap between genius and dumb jock. For Wallace, this was an exercise designed to help him live a more compassionate life. (shrink)

An accessible introduction to the many intersections between the work of David Foster Wallace and the world of philosophical inquiry.

In 2005, Wallace gave a commencement address at Kenyon College that later became famous under the title This Is Water, and that both summarizes and schematizes Wallace’s thoughts on consciousness. The present essay, therefore, uses This Is Water as a cornerstone for analysis in order to indicate how the contents of This Is Water pervade all of Wallace’s fiction, how these contents lead back to the central theme of consciousness, and how, as a result, all of (...) class='Hi'>Wallace’s fiction can be said to explore the theme of consciousness. The method is as follows: each facet of Wallace’s discourse on consciousness is treated individually, in its own section or subsection. Each facet, also, is transposed from its theoretical formulation in This Is Water to at least one paradigmatic representation in Wallace’s fiction. The fictional examples cover all of Wallace’s four mature works, which should suffice to indicate the pervasiveness of the treated concepts throughout Wallace’s fiction. I have not included Wallace’s first novel (except for a brief mention) and first short-story collection for simple reasons of length. That these two works constitute further proof in defense of the present argument can be demonstrated, but in another setting. Here, delimitation was needed, I felt, for the sake of clarity. (shrink)

This essay argues that Wallace’s non-fiction presents a sociology that constitutes the foundation of Wallace’s literary project. By tracing the influences of Wallace’s sociology and by contrasting Wallace’s non-fictional works with those of Zygmunt Bauman, Ulrich Beck, Anthony Giddens and Christopher Lasch, this essay provides a necessary contribution to an adequate critique of the foundation of Wallace’s literary ethics. Finally, the analysis proposes that an existentialist contradiction pervades Wallace’s work. This contradiction revolves around the (...) problem of free will, and it characterizes a particularly strong wave of contemporary western ethics. (shrink)

The book_ Fate, Time, and Language: An Essay on Free Will_, published in 2010 by Columbia University Press, presented David Foster Wallace's challenge to Richard Taylor's argument for fatalism. In this anthology, notable philosophers engage directly with that work and assess Wallace's reply to Taylor as well as other aspects of Wallace's thought. With an introduction by Steven M. Cahn and Maureen Eckert, this collection includes essays by William Hasker, Gila Sher, Marcello Oreste Fiocco, Daniel (...) R. Kelly, Nathan Ballantyne, Justin Tosi, and Maureen Eckert. These thinkers explore Wallace's philosophical and literary work, illustrating remarkable ways in which his philosophical views influenced and were influenced by themes developed in his other writings, both fictional and nonfictional. Together with _Fate, Time, and Language_, this critical set unlocks key components of Wallace's work and its traces in modern literature and thought. (shrink)

In 1997, David Foster Wallace published “The Depressed Person,” a short story about a privileged, deeply unhappy woman dedicated to exploring and recounting the texture and etiology of her chronic depression. This essay argues that “The Depressed Person” challenges the long-standing assumption that narrativizing the pain of depression is crucial to overcoming it, and the contemporary view that empathic responses from others promote recovery of the depressed. Taken together, these two critiques inform Wallace’s portrayal of chronic (...) depression as an interactive phenomenon that is articulated, sustained, and regenerated through problematic contexts of interaction. Written at a time when public knowledge of and talk about depression was surging, “The Depressed Person” holds an important, if presently under-recognized place, in the expansive corpus of depression texts that emerged in the 1990s. (shrink)

In a satiric chapter of David Foster Wallace’s novel Infinite Jest, a mock media expert reports how American consumers of the near future recoil from a new communication device known as “videophony” and return to the voice-only telephone of the Bell Era. This article explores the said chapter in the framework of media theories reading the telephone as a “synecdoche of technology,” considering Wallace’s vision of videophony’s rise and fall in a future society from two angles: (...) It discusses the antitechnological bent of the chapter against the background of other visions of future media in 1990s American fiction and it foregrounds the segment’s emphasis on solipsism as a destructive force in all forms of communication. The article argues that Infinite Jest moves beyond questions relevant only to the (video) telephone itself. Rather, Wallace’s novel contrasts literary communication—complex, multilayered, at times monumental—with discourses and practices overly optimistic with regard to the facility of mediated interactions per se. (shrink)

This book argues that David Foster Wallace failed to provide a response to the existential predicament of our time. Wallace wanted to confront despair through art, but he remained trapped, and his entrapment originates in the ‘existentialist contradiction’: the impossibility of affirming the meaningfulness of life and an ethics of compassion while believing in free will. To substantiate this thesis, the analysis reads Wallace in conversation with the existentialist philosophers and writers who influenced him: Søren (...) Kierkegaard, Fyodor Dostoevsky, Martin Heidegger, Jean-Paul Sartre, Albert Camus, and Ludwig Wittgenstein. It compares his non-fiction with the sociologies of Christopher Lasch, Zygmunt Bauman, Ulrich Beck, and Anthony Giddens. And it finds inspiration in Giacomo Leopardi, Friedrich Nietzsche, and Emanuele Severino to conclude that the philosophy which pervades Wallace’s works entails despair and represents the essence of our civilization’s interpretation of the world. (shrink)

This article argues that Sartre’s “What Is Literature?” had a profound and direct influence on David Foster Wallace’s conception of literature. At the very least, a number of factors oblige scholars to take this interpretation seriously. We know that Sartre’s existentialism pervades Wallace’s fiction, that Wallace repeatedly mentioned the Existentialists throughout his work, that he’d learned French to read them in the original, and that Sartre was one of his favorites, as testified by Zadie Smith. (...) Most importantly, a comparative analysis of Sartre’s text and Wallace’s nonfiction shows not only striking parallels but also almost exact repetitions in the writers’ fundamental ideals. In this sense, Sartre’s direct influence on Wallace appears so major as to invest multiple specific details of Wallace’s conception of literature both in its content and in the logical structuring of that content. In this article, we explore the extent of this influence through a structured investigation of its multiple features, showing that many of Wallace’s tenets – the rejection of Realism, the affirmation of meaning-as-use and of literature as a means to human communion and individual and social engagement, and many many more – follow from Sartre’s discourse. (shrink)

This article argues that Tolstoy’s What Is Art? had a direct influence on David Foster Wallace’s conception of literature, and most specifically that Wallace appropriated Tolstoy’s discourse (down to most of its most specific details) to found his literary project. The article seeks to prove this by exhibiting the striking extent of Wallace’s alignment with Tolstoy’s beliefs, by retracing the multiple direct references to Tolstoy in Wallace’s work, and by uncovering Wallace’s annotations on (...) his own copy of What Is Art? as further confirmation of what a careful comparative analysis of the works of the two authors makes manifest. (shrink)

This essay investigates the influence of the films of David Lynch on David Foster Wallace’s major novel Infinite Jest. It is organized in two sections. Section one illustrates Wallace’s views on what real art should be, as they are expressed in his two famous “manifestos,” and proceeds to read the essay “David Lynch Keeps His Head” in relation to the manifestos in order to demonstrate that Lynch’s influence on Wallace’s thought has not yet (...) been fully grasped. Section two delves into Infinite Jest to examine textual proof of the Wallace-Lynch connection, both in content and form. Content-wise, convergences are proven to permeate both authors’ interest in theories of consciousness, typified in themes such as: psychoanalysis, especially the Oedipus Complex; self-deception; the Sartrean “look;” the corporeal subject and the phenomenological distinction between objective body and lived body. Form-wise, the following narrative items are mapped: Lynch’s surrealism, recognizable in paradigmatic scenes from Infinite Jest; the character-idea, as both authors embody abstract ideas in characters; and a formal commitment to “an anti-teleological spirit.” Finally, the analysis takes into consideration Lynch’s films produced prior or during the writing of Infinite Jest, and exclusively those Wallace expressed direct admiration for, namely: Eraserhead (1977), The Elephant Man (1980), Blue Velvet (1986), and Lost Highway (1997). (shrink)

What is called ``orthodox'' quantum mechanics, as presented in standard foundational discussions, relies on two substantive assumptions --- the projection postulate and the eigenvalue-eigenvector link --- that do not in fact play any part in practical applications of quantum mechanics. I argue for this conclusion on a number of grounds, but primarily on the grounds that the projection postulate fails correctly to account for repeated, continuous and unsharp measurements and that the eigenvalue-eigenvector link implies that virtually all interesting properties are (...) maximally indefinite pretty much always. I present an alternative way of conceptualising quantum mechanics that does a better job of representing quantum mechanics as it is actually used, and in particular that eliminates use of either the projection postulate or the eigenvalue-eigenvector link, and I reformulate the measurement problem within this new presentation of orthodoxy. (shrink)

It is widely recognized that ‘global’ symmetries, such as the boost invariance of classical mechanics and special relativity, can give rise to direct empirical counterparts such as the Galileo-ship phenomenon. However, conventional wisdom holds that ‘local’ symmetries, such as the diffeomorphism invariance of general relativity and the gauge invariance of classical electromagnetism, have no such direct empirical counterparts. We argue against this conventional wisdom. We develop a framework for analysing the relationship between Galileo-ship empirical phenomena on the one hand, and (...) physical theories that model such phenomena on the other, that renders the relationship between theoretical and empirical symmetries transparent, and from which it follows that both global and local symmetries can give rise to Galileo-ship phenomena. In particular, we use this framework to exhibit an analogue of Galileo’s ship for the local gauge invariance of electromagnetism. 1 Introduction2 Analogues of Galileo’s Ship? Faraday’s Cage and t’Hooft’s Beam-Splitter2.1 Faraday’s cage2.2 t’Hooft’s beam-splitter3 A Framework for Symmetries I: Systems and Subsystems4 An Example: Coulombic Electrostatics5 A Framework for Symmetries II: The Relationship between Theoretical and Empirical Symmetries6 Newtonian Gravity7 Local Symmetries that Are Not Boundary-Preserving: Classical Electromagnetism and Faraday’s Cage8 Local Boundary-Preserving Symmetries: Klein-Gordon-Maxwell Gauge Theory and t’Hooft’s Beam-Splitter9 Summary10 Conclusions. (shrink)

This article provides current Schwartz Values Survey (SVS) data from samples of business managers and professionals across 50 societies that are culturally and socioeconomically diverse. We report the society scores for SVS values dimensions for both individual- and societal-level analyses. At the individual-level, we report on the ten circumplex values sub-dimensions and two sets of values dimensions (collectivism and individualism; openness to change, conservation, self-enhancement, and self-transcendence). At the societal-level, we report on the values dimensions of embeddedness, hierarchy, mastery, affective (...) autonomy, intellectual autonomy, egalitarianism, and harmony. For each society, we report the Cronbach’s α statistics for each values dimension scale to assess their internal consistency (reliability) as well as report interrater agreement (IRA) analyses to assess the acceptability of using aggregated individual level values scores to represent country values. We also examined whether societal development level is related to systematic variation in the measurement and importance of values. Thus, the contributions of our evaluation of the SVS values dimensions are two-fold. First, we identify the SVS dimensions that have cross-culturally internally reliable structures and within-society agreement for business professionals. Second, we report the society cultural values scores developed from the twenty-first century data that can be used as macro-level predictors in multilevel and single-level international business research. (shrink)

In this collection of scenarios and episodes, many of which were experienced by the authors in their years as school administrators, you will find an array of provocative examples of social injustice in the classroom, and what you can do to prevent it in your own school community.

David Wallace argues that we should take quantum theory seriously as an account of what the world is like--which means accepting the idea that the universe is constantly branching into new universes. He presents an accessible but rigorous account of the 'Everett interpretation', the best way to make coherent sense of quantum physics.

McTaggart raised a famed paradox regarding the transientist conception of time, the idea that the present moves into the future to overtake future events (or, alternatively, that future events move into the present) and past events recede further and further into the past as time goes on. Schlesinger has recently attempted an ingenious transientist solution to McTaggart's paradox. We will argue that Schlesinger's solution to McTaggart's paradox itself gives rise to a new, yet perfectly parallel, paradox which can only be (...) resolved by abandoning the transientist view of time. (shrink)

According to Bayesian epistemology, the epistemically rational agent updates her beliefs by conditionalization: that is, her posterior subjective probability after taking account of evidence X, pnew, is to be set equal to her prior conditional probability pold(·|X). Bayesians can be challenged to provide a justification for their claim that conditionalization is recommended by rationality—whence the normative force of the injunction to conditionalize? There are several existing justifications for conditionalization, but none directly addresses the idea that conditionalization will be epistemically rational (...) if and only if it can reasonably be expected to lead to epistemically good outcomes. We apply the approach of cognitive decision theory to provide a justification for conditionalization using precisely that idea. We assign epistemic utility functions to epistemically rational agents; an agent’s epistemic utility is to depend both upon the actual state of the world and on the agent’s credence distribution over possible states. We prove that, under independently motivated conditions, conditionalization is the unique updating rule that maximizes expected epistemic utility. (shrink)

Using as a starting point recent and apparently incompatible conclusions by Saunders and Knox, I revisit the question of the correct spacetime setting for Newtonian physics. I argue that understood correctly, these two versions of Newtonian physics make the same claims both about the background geometry required to define the theory, and about the inertial structure of the theory. In doing so I illustrate and explore in detail the view—espoused by Knox, and also by Brown —that inertial structure is defined (...) by the dynamics governing subsystems of a larger system. This clarifies some interesting features of Newtonian physics, notably the distinction between using the theory to model subsystems of a larger whole and using it to model complete universes, and the scale-relativity of spacetime structure. _1_ Introduction _2_ Newtonian Mechanics and Galilean Spacetime _3_ Vector Relationism and Maxwellian Spacetime _4_ Recovering the Galilei Group: Dynamics of Subsystems _5_ Knox on Inertial Structure _6_ Connections on Maxwellian Spacetime _7_ Knox on Newtonian Gravity _8_ Vector Relationism and Newton–Cartan Theory _9_ Inertial Structure in Newton–Cartan Gravity _10_ Reconciling Knox and Saunders _11_ Conclusions. (shrink)

The world is becoming deeply interconnected, whereby actions in one part of the world can have profound repercussions elsewhere. In a world of overlapping communities of fate, there has been a renewed enthusiasm for thinking about what it is that human beings have in common, and to explore the ethical basis of this. This has led to a renewed interest in examining the normative principles that might underpin efforts to resolve global collective action problems and to ameliorate serious global risks. (...) This project can be referred to as the project of cosmopolitanism. In response to this renewed cosmopolitan enthusiasm, this volume has brought together 25 seminal essays in the development of cosmopolitan thought by some of the world's most distinguished cosmopolitan thinkers and critics. It is divided into six sections: classical cosmopolitanism, global justice, culture and cosmopolitanism, political cosmopolitanism, cosmopolitan global governance and critical examinations. This volume thus provides a thorough and extensive introduction to contemporary cosmopolitan thought and acts as a definitive source for those interested in cosmopolitan thinking and its critics. See also David Held's _Cosmopolitanism: Ideals and Realities_. (shrink)

What ontology does realism about the quantum state suggest? The main extant view in contemporary philosophy of physics is wave-function realism . We elaborate the sense in which wave-function realism does provide an ontological picture, and defend it from certain objections that have been raised against it. However, there are good reasons to be dissatisfied with wave-function realism, as we go on to elaborate. This motivates the development of an opposing picture: what we call spacetime state realism , a view (...) which takes the states associated to spacetime regions as fundamental. This approach enjoys a number of beneficial features, although, unlike wave-function realism, it involves non-separability at the level of fundamental ontology. We investigate the pros and cons of this non-separability, arguing that it is a quite acceptable feature, even one which proves fruitful in the context of relativistic covariance. A companion paper discusses the prospects for combining a spacetime-based ontology with separability, along lines suggested by Deutsch and Hayden. (shrink)

I attempt to get as clear as possible on the chain of reasoning by which irreversible macrodynamics is derivable from time-reversible microphysics, and in particular to clarify just what kinds of assumptions about the initial state of the universe, and about the nature of the microdynamics, are needed in these derivations. I conclude that while a “Past Hypothesis” about the early Universe does seem necessary to carry out such derivations, that Hypothesis is not correctly understood as a constraint on the (...) early Universe’s entropy. (shrink)

I address the problem of indefiniteness in quantum mechanics: the problem that the theory, without changes to its formalism, seems to predict that macroscopic quantities have no definite values. The Everett interpretation is often criticised along these lines, and I shall argue that much of this criticism rests on a false dichotomy: that the macroworld must either be written directly into the formalism or be regarded as somehow illusory. By means of analogy with other areas of physics, I develop the (...) view that the macroworld is instead to be understood in terms of certain structures and patterns which emerge from quantum theory (given appropriate dynamics, in particular decoherence). I extend this view to the observer, and in doing so make contact with functionalist theories of mind. (shrink)

Coordinate-based approaches to physical theories remain standard in mainstream physics but are largely eschewed in foundational discussion in favour of coordinate-free differential-geometric approaches. I defend the conceptual and mathematical legitimacy of the coordinate-based approach for foundational work. In doing so, I provide an account of the Kleinian conception of geometry as a theory of invariance under symmetry groups; I argue that this conception continues to play a very substantial role in contemporary mathematical physics and indeed that supposedly ``coordinate-free'' differential geometry (...) relies centrally on this conception of geometry. I discuss some foundational and pedagogical advantages of the coordinate-based formulation and briefly connect it to some remarks of Norton on the historical development of geometry in physics during the establishment of the general theory of relativity. (shrink)

I argue against the currently prevalent view that algebraic quantum field theory (AQFT) is the correct framework for philosophy of quantum field theory and that “conventional” quantum field theory (CQFT), of the sort used in mainstream particle physics, is not suitable for foundational study. In doing so, I defend that position that AQFT and CQFT should be understood as rival programs to resolve the mathematical and physical pathologies of renormalization theory, and that CQFT has succeeded in this task and AQFT (...) has failed. I also defend CQFT from recent criticisms made by Doreen Fraser. (shrink)

I respond to the frequent objection that structural realism fails to sharply state an alternative to the standard predicate-logic, object / property / relation, way of doing metaphysics. The approach I propose is based on what I call a ‘math-first’ approach to physical theories (close to the so-called ‘semantic view of theories') where the content of a physical theory is to be understood primarily in terms of its mathematical structure and the representational relations it bears to physical systems, rather than (...) as a collection of sentences that attempt to make true claims about those systems (a ‘language-first’ approach). I argue that adopting the math-first approach already amounts to a form of structural realism, and that the choice between epistemic and ontic versions of structural realism is then a choice between a language-first and math-first view of metaphysics; I then explore the status of objects (and properties and relations) in fundamental and non-fundamental physics for both versions of math-first structural realism. (shrink)

I criticize the widely-defended view that the quantum measurement problem is an example of underdetermination of theory by evidence: more specifically, the view that the unmodified, unitary quantum formalism (interpreted following Everett) is empirically indistinguishable from Bohmian Mechanics and from dynamical-collapse theories like the GRW or CSL theories. I argue that there as yet no empirically successful generalization of either theory to interacting quantum field theory and so the apparent underdetermination is broken by a very large class of quantum experiments (...) that require field theory somewhere in their description. The class of quantum experiments reproducible by either is much smaller than is commonly recognized and excludes many of the most iconic successes of quantum mechanics, including the quantitative account of Rayleigh scattering that explains the color of the sky. I respond to various arguments to the contrary in the recent literature. (shrink)

I analyse the conceptual and mathematical foundations of Lagrangian quantum field theory (QFT) (that is, the ‘naive’ (QFT) used in mainstream physics, as opposed to algebraic quantum field theory). The objective is to see whether Lagrangian (QFT) has a sufficiently firm conceptual and mathematical basis to be a legitimate object of foundational study, or whether it is too ill-defined. The analysis covers renormalisation and infinities, inequivalent representations, and the concept of localised states; the conclusion is that Lagrangian QFT (at least (...) as described here) is a perfectly respectable physical theory, albeit somewhat different in certain respects from most of those studied in foundational work. (shrink)

`Quantum theory' is not a single physical theory but a framework in which many different concrete theories fit. As such, a solution to the quantum measurement problem ought to provide a recipe to interpret each such concrete theory, in a mutually consistent way. But with the exception of the Everett interpretation, the mainextant solutions either try to make sense of the abstract framework as if it were concrete, or else interpret one particular quantum theory under the fiction that it is (...) fundamental and exact. In either case, these approaches are unable to help themselves to the very theory-laden, level-relative ways in which quantum theory makes contact with experiment in mainstream physics, and so are committed to major revisionary projects which have not been carried out even in outline. As such, only the Everett interpretation is currently suited to make sense of quantum physics as we find it. (shrink)

I present a proof of the quantum probability rule from decision-theoretic assumptions, in the context of the Everett interpretation. The basic ideas behind the proof are those presented in Deutsch's recent proof of the probability rule, but the proof is simpler and proceeds from weaker decision-theoretic assumptions. This makes it easier to discuss the conceptual ideas involved in the proof, and to show that they are defensible.

I give a fairly systematic and thorough presentation of the case for regarding black holes as thermodynamic systems in the fullest sense, aimed at students and non-specialists and not presuming advanced knowledge of quantum gravity. I pay particular attention to the availability in classical black hole thermodynamics of a well-defined notion of adiabatic intervention; the power of the membrane paradigm to make black hole thermodynamics precise and to extend it to local-equilibrium contexts; the central role of Hawking radiation in permitting (...) black holes to be in thermal contact with one another; the wide range of routes by which Hawking radiation can be derived and its back-reaction on the black hole calculated; the interpretation of Hawking radiation close to the black hole as a gravitationally bound thermal atmosphere. In an appendix I discuss recent criticisms of black hole thermodynamics by Dougherty and Callender. This paper confines its attention to the thermodynamics of black holes; a sequel will consider their statistical mechanics. (shrink)

I give an introduction to the conceptual structure of quantum field theory as it is used in mainstream theoretical physics today, aimed at non-specialists. My main focuses in the article are the common structure of quantum field theory as it is applied in solid-state physics and as it is applied in high-energy physics; the modern theory of renormalisation.

This is a discussion of how we can understand the world-view given to us by the Everett interpretation of quantum mechanics, and in particular the role played by the concept of 'world'. The view presented is that we are entitled to use 'many-worlds' terminology even if the theory does not specify the worlds in the formalism; this is defended by means of an extensive analogy with the concept of an 'instant' or moment of time in relativity, with the lack of (...) a preferred foliation of spacetime being compared with the lack of a preferred basis in quantum theory. Implications for identity of worlds over time, and for relativistic quantum mechanics, are discussed. (shrink)

I provide a fairly systematic analysis of when quantities that are variant under a dynamical symmetry transformation should be regarded as unobservable, or redundant, or unreal; of when models related by a dynamical symmetry transformation represent the same state of affairs; and of when mathematical structure that is variant under a dynamical symmetry transformation should be regarded as surplus. In most of these cases the answer is `it depends': depends, that is, on the details of the symmetry in question. A (...) central feature of the analysis is that in order to draw any of these conclusions for a dynamical symmetry it needs to be understood in terms of its possible extensions to other physical systems, in particular to measurement devices. (shrink)