Physicalism

What marks emergence as a metaphysically interesting idea is that many macro-level entities and their properties are ontologically and causally autonomous in relation to the micro-level entities and properties they depend on---or so argues Jessica Wilson in Metaphysical Emergence (2021). To do so, she adopts a “metaphysically highly neutral” (p. 32) approach to questions about powers, causation, properties, and laws. That is, while explaining what emergence is and arguing that there is indeed emergence in the natural world, she doesn’t restrict (...) her analyses and arguments to any specific metaphysical accounts of these concepts, and she doesn’t commit to any controversial theses about them. In this article, I assess Wilson’s project against this methodological ideal of metaphysical neutrality. (shrink)

"The doctrine of materialism is one of the perennial and most controversial ideas in the arts and sciences. Throughout history it has aroused strong passions, and in the Sixteenth and Twentieth centuries was a doctrine over which people were persecuted and killed. Yet it has been equally aligned with empirical, enlightened and tolerant thinking. This book explores the fascinating and important philosophy of materialism in an engaging and thought-provoking way. Opening with an overview of the ideas of some of the (...) most important materialists, including Lucretius, Epicurus, Hobbes and Hume up to Darwin and Marx, Brown and Ladyman show how materialism's origins were twofold: it was an early form of scientific explanation but also an intellectual outlook, or belief-system, about the world in general. They then explain how materialism's beginnings as imaginative vision of the true nature of things faced a major challenge from modern physics, in the form of quantum theory and the general theory of relativity. This posed major questions for materialism: how could it be reconciled with unobservable entities and new discoveries about the nature of space and time? As the authors show, out of this challenge materialism did not die but re-emerged - as the new doctrine of physicalism. Drawing on colourful examples throughout - from modern physics, the nature of the mind, and atheism - the authors argue that whilst materialism may not have all the answers, its humanism and staunch belief in observation, evidence and experiment remains our best hope in a fragmented and hyper-specialised world"--. (shrink)

I define two metaphysical positions that anti-physicalists can take in response to Jonathan Schaffer’s ground functionalism. Ground functionalism is a version of physicalism where explanatory gaps are everywhere. If ground functionalism is true, arguments against physicalism based on the explanatory gap between the physical and experiential facts fail. In response, first, I argue that some anti-physicalists are already safe from Schaffer’s challenge. These anti-physicalists reject an underlying assumption of ground functionalism: the assumption that macrophysical entities are something over and above (...) the fundamental entities. I call their position “lightweight anti-physicalism.” Second, I go on to argue that even if anti-physicalists accept Schaffer’s underlying assumption, they can still argue that the consciousness explanatory gap is especially mysterious and thus requires a special explanation. I call the resulting position “heavyweight anti-physicalism.” In both cases, the consciousness explanatory gap is a good way to argue against physicalism. (shrink)

Why quantum physics works. (Why quantum philosophy works.) And why it doesn’t. It’s all about fusion guitar. You could call it 'philosophical (and physical) fusion.' .

This paper describes a version of type identity physicalism, which we call Flat Physicalism, and shows how it meets several objections often raised against identity theories. This identity theory is informed by recent results in the conceptual foundations of physics, and in particular clar- ifies the notion of ‘physical kinds’ in light of a conceptual analysis of the paradigmatic case of reducing thermody- namics to statistical mechanics. We show how Flat Physi- calism is compatible with the appearance of multiple realisation (...) in the special sciences, and how and in what sense the special sciences laws are autonomous from the laws of physics, despite the full reductive picture of Flat Physicalism. We compare our view with a recent proposal by William Bechtel that accounts for the appearance of levels in mechanistic explanations. (shrink)

In this paper, we make a case for the disjunctive view of phenomenal consciousness: consciousness is essentially disjunctive in being either physical or non-physical in the sense that it has both physical and non-physical possible instances. We motivate this view by showing that it undermines two well-known conceivability arguments in philosophy of mind: the zombie argument for anti-physicalism, and the anti-zombie argument for physicalism. By appealing to the disjunctive view, we argue that two hitherto unquestioned premises of these arguments are (...) false. Furthermore, making use of the resources of this view, we formulate distinct forms of both physicalism and anti-physicalism. On these formulations, it is easy to see how physicalists and anti-physicalists can accommodate the modal intuitions of their opponents regarding zombies and anti-zombies. We conclude that these formulations of physicalism and anti-physicalism are superior to their more traditional counterparts. (shrink)

Nature tokenizes an always-present circle (the circular-linear relationship) (one zero-one one) (circumference and diameter) (literally and figuratively). Meaning, everything we 'see' in Nature is a token for a circle. Meaning, technology, specifically crypto-technology, will eventually take over what we currently 'know' as 'government.' (Authority in general.) For the intelligent anarchist in all of us.

Abstract is a noun. Abstract is, also, a verb. Thus, abstraction. Explaining nouns. And verbs.

How superposition explains the human mind. And, also, the Universe.

This article examines the mutual influence between Ernst Cassirer and his cousin, the neurologist Kurt Goldstein. For both Cassirer and Goldstein, views on the nature of human cognition were fundamental to their understanding of scientific knowledge, and these were informed by both philosophical theorizing and empirical research on pathologies of the nervous system. Following Cassirer, and in agreement with the physicalism of the Vienna Circle, Goldstein held that the physical sciences had progressed by arriving at abstract, mathematical representations to take (...) the place of qualitative characterizations of observable reality. In tension with physicalism, Goldstein was not sanguine about the fruitfulness of the abstractive approach in biology. He proposed that biology must adhere to its own sui generis methods of observation and experimentation in order to obtain knowledge of the “natures” of living organisms. I argue that there is a parallel with Cassirer’s assertion of the differences between physical and cultural sciences, underwritten by the deployment of varying symbolic functions. I also propose that the neurological writings of Goldstein are an important backdrop to Cassirer’s positive evaluation of abstract thought, in contrast to the pessimism regarding a worldview dominated by scientific abstractions expressed by philosophers such as Bergson, Whitehead, and Husserl. (shrink)

What are the metaphysical commitments which best 'make sense' of our scientific practice? In this book, Andreas Hüttemann provides a minimal metaphysics for scientific practice, i.e. a metaphysics that refrains from postulating any structure that is explanatorily irrelevant. Hüttemann closely analyses paradigmatic aspects of scientific practice, such as prediction, explanation and manipulation, to consider the questions whether and what metaphysical presuppositions best account for these practices. He looks at the role which scientific generalisation play in predicting, testing, and explaining the (...) behaviour of systems. He also develops a theory of causation in terms of quasi-inertial processes and interfering factors, and he proposes an account of reductive practices that makes minimal metaphysical assumptions. His book will be valuable for scholars and advanced students working in both philosophy of science and metaphysics. (shrink)

Alter elaborates and defends an ambitious argument advanced by Chalmers against physicalism. As Alter notes, the argument is valid. But I will argue that not all its premises are true. In particular, it is false that all physical truths are purely structural. In denying this, I focus not on the objects of pure physical theory but on the homely, macroscopic objects of our daily lives.

The concept of quantum information is introduced as both normed superposition of two orthogonal sub-spaces of the separable complex Hilbert space and in-variance of Hamilton and Lagrange representation of any mechanical system. The base is the isomorphism of the standard introduction and the representation of a qubit to a 3D unit ball, in which two points are chosen. The separable complex Hilbert space is considered as the free variable of quantum information and any point in it (a wave function describing (...) a state of a quantum system) as its value as the bound variable. A qubit is equivalent to the generalization of ‘bit’ from the set of two equally probable alternatives to an infinite set of alternatives. Then, that Hilbert space is considered as a generalization of Peano arithmetic where any unit is substituted by a qubit and thus the set of natural number is mappable within any qubit as the complex internal structure of the unit or a different state of it. Thus, any mathematical structure being reducible to set theory is re-presentable as a set of wave functions and a subspace of the separable complex Hilbert space, and it can be identified as the category of all categories for any functor represents an operator transforming a set (or subspace) of the separable complex Hilbert space into another. Thus, category theory is isomorphic to the Hilbert-space representation of set theory & Peano arithmetic as above. Given any value of quantum information, i.e. a point in the separable complex Hilbert space, it always admits two equally acceptable interpretations: the one is physical, the other is mathematical. The former is a wave function as the exhausted description of a certain state of a certain quantum system. The latter chooses a certain mathematical structure among a certain category. Thus there is no way to be distinguished a mathematical structure from a physical state for both are described exhaustedly as a value of quantum information. This statement in turn can be utilized to be defined quantum information by the identity of any mathematical structure to a physical state, and also vice versa. Further, that definition is equivalent to both standard definition as the normed superposition and in-variance of Hamilton and Lagrange interpretation of mechanical motion introduced in the beginning of the paper. Then, the concept of information symmetry can be involved as the symmetry between three elements or two pairs of elements: Lagrange representation and each counterpart of the pair of Hamilton representation. The sense and meaning of information symmetry may be visualized by a single (quantum) bit and its interpretation as both (privileged) reference frame and the symmetries of the Standard model. (shrink)

This article initially presents Ernst Mach's anti-realist or instrumentalist stance that underpin his opposition to atomism and reveal his idea that science should be based totally on objectively observable facts. Then, the details of Mach's phenomenalist arguments which recognize only sensations as real are revealed. Phenomenalist thought is not compatible with the idea of realism, which evaluates unobservable entities such as atom, molecule and quark as mind-independent things. In this context, Mach considers the atom as a thought symbol or a (...) metaphysical fiction. This results in the idea that the existence of matter or entity is not independent of the perceiving minds, which is considered Mach’s subjective idealism. As a result of these arguments, the article argues that it would not be wrong to associate Mach's thoughts with solipsism, a radical form of subjective idealism. -/- Bu makalede ilk olarak Ernst Mach’ın atomun varlığına ilişkin itirazının temelini oluşturan ve bilimin sadece gözlemlenebilir olgulara dayandırılması gerektiği yönündeki düşüncelerini ortaya koyan anti-realist ya da enstrümantalist görüşlerine yer verilmektedir. Ardından Mach’ın enstrümantalist tavrının alt metninde bulunan ve yalnızca duyumları gerçek olarak kabul eden fenomenalist argümanlarının ayrıntıları serimlenecektir. Fenomenalist düşünce atom, molekül ve kuark gibi gözlemlenemeyen varlıkları zihinden bağımsız şeyler olarak değerlendiren realizm düşüncesi ile uyuşmamaktadır. Bu bağlamda yapılan incelemeler, Mach’ın atomu bir düşünce sembolü ya da metafiziksel bir kurgu olarak değerlendirmesine ve dış dünyadaki varlıkların var olmasını, onların bir zihin tarafından duyumsanması koşuluna bağlaması ile sonuçlanmaktadır. Makalede Mach’ın öznel idealizmi olarak ele alabileceğimiz bu argümanlarının radikal bir sonucu olarak onun düşüncelerini solipsizm ile ilişkilendirmenin yanlış olmayacağı sonucuna varılmaktadır. (shrink)

Lynne Baker was a trenchant critic of reductionist and physicalist conceptions of the universe, as well as the foremost defender of the constitution view of human persons. Baker was a staunch defender of a kind of practical realism, or what she sometimes called a metaphysics of everyday life. And it was this general “common sense” philosophical outlook that underwrote her non-reductionist, constitution view of reality. Whereas most of her contemporaries were given to metaphysical reductionism and eliminativism, born of a penchant (...) for so-called Quinean desert landscapes, Baker was unapologetic and philosophically deft in her defense of ontological pluralism. This volume honors Baker’s work by bringing together 16 critical essays by some of her students, colleagues, interlocutors, and friends. The essays fall into four areas, each an area to which Baker made unique and influential contributions: Practical Realism about the Mind, The Constitution View of Human Persons, The First Person Perspective, and God, Christianity and Naturalism. (shrink)

According to one conception of strong emergence, strongly emergent properties are nomologically necessitated by their base properties and have novel causal powers relative to them. In this paper, I raise a difficulty for this conception of strong emergence, arguing that these two features are incompatible. Instead of presenting this as an objection to the friends of strong emergence, I argue that this indicates that there are distinct varieties of strong emergence: causal emergence and epiphenomenal emergence. I then explore the prospects (...) of emergentism with this distinction in the background. (shrink)

This article is a philosophical elucidation about the concept of nature in relation to man. The question is not idle: is there something such as nature, or is it only a way of stringing together everything that is not man-made? Given that the ethical, political and instrumental dimension that will be adopted depends on the way in which this concept is constructed. The concept of life is also analyzed. It is concluded that the solutions for biosphere sustainability must be radical (...) and that there is no need to depend on the ghost of our disappearance as a species to make definitive and long-term decisions. (shrink)

I shall argue in this article that there are certain objectual and methodological boundaries imposed by the nature of physics that all formulations of physicalism based on physical theories should respect. Therefore, empirical physicalism – i.e., the sort of physicalism that is eager to accept all the entities included in some future, ideal and complete physical theory and all entities dependent on them (see Jeffrey Poland and Janice Dowell) – is already committed to the exclusion of certain sorts of entities (...) from its ontological inventory and it is far less tolerant than one might expect. After having presented my argument, I shall describe four plausible boundaries to what can be studied by physics. The boundaries will contribute to constructing a new version of physicalism, i.e., physics physicalism, whose acceptance is entailed by the acceptance of empirical physicalism. Finally, I shall briefly deal with three objections against my strategy and I shall evaluate the consequences of the acceptance of my conclusions for both physicalists and non-physicalists. (shrink)

This paper explores early Australasian philosophy in some detail. Two approaches have dominated Western philosophy in Australia: idealism and materialism. Idealism was prevalent between the 1880s and the 1930s, but dissipated thereafter. Idealism in Australia often reflected Kantian themes, but it also reflected the revival of interest in Hegel through the work of ‘absolute idealists’ such as T. H. Green, F. H. Bradley, and Henry Jones. A number of the early New Zealand philosophers were also educated in the idealist tradition (...) and were influential in their communities, but produced relatively little. In Australia, materialism gained prominence through the work of John Anderson, who arrived in Australia in 1927, and continues to be influential. John Anderson had been a student of Henry Jones, who might therefore be said to have influenced both main strands of Australian philosophical thought. (shrink)

In this paper, I propose a general taxonomy of different forms of eliminativism. In order to do so, I begin by exploring eliminativism from a broad perspective, providing a comparative picture of eliminativist projects in different domains. This exploration shows that eliminativism is a label used for a family of related types of eliminativist arguments and claims. The proposed taxonomy is an attempt to systematise those arguments and claims.

RÉSUMÉ: J’examine en détail l’argument vaguement suggéré par Davidson selon lequel le holisme entraînerait l’irreductibilité du mental. Je défends cet argument contre deux objections souvent faites contre des arguments visant à dériver des thèses métaphysiques à partir de prémisses portant sur nos critères ordinaires d’application de nos termes. J’invoque la sémantique bidimensionnelle pour expliquer les liensentre ces critères et les questions touchant la référence et la réduction. Je montre comment l’irréductibilité du mental dérive du caractère holiste et flexible des critères (...) d’attribution de croyances et d’états intentionnels.ABSTRACT: I examine in detail the argument vaguely suggested by Davidson to the effect that holism entails the irreducibility of the mental. I defend this argument against two objections often made against arguments that attempt to derive metaphysical theses from premises that concern our ordinary criteria for applying terms. I appeal to two-dimensional semantics to explain the links between these criteria and issues about relerence and reduction. I show how the irreducibility of the mental follows from the holistic and flexible character of our criteria for attributing beliefs and intentional states. (shrink)

In the ongoing debate, there are a set of mind-body theories sharing a certain physicalist assumption: whenever a genuine cause produces an effect, the causal efficacy of each of the nonphysical properties that participate in that process is determined by the instantiation of a well-defined set of physical properties. These theories would then insist that a nonphysical property could only be causally efficacious insofar as it is physically implemented. However, in what follows we will argue against the idea that fine-grained (...) mental contents could be physically implemented in the way that functional properties are. Therefore, we will examine the metaphysical conditions under which the implementing mechanism of a particular instance of a functional property may be individuated, and see how genuine beliefs and desires—insofar as they track the world—cannot meet such conditions. (shrink)

Las preguntas importantes, o que parecen importantes, no tienen por qué tener respuestas importantes, incluso no tienen por qué tener respuestas. Me propongo explorar qué respuestas, importantes o no importantes, puede recibir, si es que puede recibir alguna respuesta, la importante pregunta “¿qué es un buen argumento?”.Important questions, or questions that seem important, need not have important answers, moreover, they need not have answers at all. I propose to explore what answers, whether important or not, we could obtain, if some (...) answer can be obtained at all, to the important question “what is a good argument?”. (shrink)

This paper discusses and evaluates a recent argument for the conclusion that an attractive variety of Russellian monism ought to be regarded as a form of physicalism. According to this line of thought, if the Russellian’s “inscrutable” properties are held to ground not only experience, but also the physical structure of the world—and in this sense are not “experience-specific”—they thereby have an unproblematic place in physicalist metaphysics. I argue, in contrast, that there can be a sense in which the Russellian’s (...) inscrutables are experience-specific in a way that a physicalist probably ought to find objectionable, even if they play some role other than grounding experience. This will be the case, I argue, if certain worlds are taken to be possible, as they sometimes have: worlds of “bare structure” and worlds with what might be called “swapped inscrutables”. In this way, I claim that accepting certain possibilities has consequences for how one should understand the nature of the Russellian’s inscrutables and the place they have in physicalist metaphysics. (shrink)

Human consciousness and reasoning summarize all physical data into laws and create the mathematical theories that lead to predictions. However, the human element that creates the theories is totally absent from the laws and theories themselves. Accordingly, human consciousness and rationality are outside the bounds of science since they cannot be detected by purely physical devices and can only be “detected” by the self in humans. One wonders if notions of information, function, and purpose, can provide explanations of such nonphysical (...) aspects of creation. (shrink)

Article on physicalism and evolutionary explanations.

Life as self-organization is philosophically understood by L. Polo in terms of co-causality between matter, formal configuration and intrinsic efficiency. This characterization provides a dynamic account of life and soul, capable to explain both its identity and its continuous renovation. In this article I especially highlight in this author the metaphysical notions of finality, unity and cosmos, which may be helpful to understand the sense of biological systems in the universe.

If there is a movement or school that epitomizes analytic philosophy in the middle of the twentieth century, it is logical empiricism. Logical empiricists created a scientifically and technically informed philosophy of science, established mathematical logic as a topic in and tool for philosophy, and initiated the project of formal semantics. Accounts of analytic philosophy written in the middle of the twentieth century gave logical empiricism a central place in the project. The second wave of interpretative accounts was constructed to (...) show how philosophy should progress, or had progressed, beyond logical empiricism. The essays survey the formative stages of logical empiricism in central Europe and its acculturation in North America, discussing its main topics, and achievements and failures, in different areas of philosophy of science, and assessing its influence on philosophy, past, present, and future. (shrink)

Hempel’s Dilemma is a challenge that has to be met by any formulation of physicalism that specifies the physical by reference to a particular physical theory. It poses the problem that if one’s specification of the physical is ‘current’ physical theory, then the physicalism which depends on it is false because current physics is false; and if the specification of the physical is a future or an ideal physics, the physicalism based on it would be trivial as it would be (...) tautologously true, or because very little (if anything at all) can be inferred from or about a physics that does not yet exist. I review the reasons for thinking that the dilemma is a perpetual problem for currentist specifications of the physical, then introduce the argument that the standard positions on the specification question are wanting because they lack a generality which physicalism is generally accepted to have. I end with a suggestion for a way forward for physicalism. (shrink)

Metaphysics has been rejected as nonsense by some philosophers (notably Hume and Ayer) because metaphysical systems cannot be tested empirically. This paper argues that these systems can still usefully be compared by using such criteria as: 1) Scope; 2) Not denying basic data; 3) Plausibility; 4) The minimum number of brute facts needed; 5) Engagement with and consistency with current science; 6) Lack of ‘promissory notes’; 7) Elegance and simplicity; 8) Clarity versus fudge. Berkeley’s Idealism and Physicalism (in both qualia (...) realist and non-realist variants) are taken as examples and compared according to these criteria. Physicalism fares surprisingly poorly. It is all but inevitable that each person will possess a metaphysical system – and act upon it. If we fail to research alternatives then we are liable to assume a weak position implicitly (typically physicalism), and be reluctant to give it up. (shrink)

My thesis addresses the status of 'naturalizations' of intentionality and the recent debate about their importance. After formulating an account of scientific theory appraisal I argue, contrary to recent critics of naturalization, that there is a place for the use of 'interlevel' properties in assessing scientific theories, but that this takes a more modest form than that assumed by the physicalist proponents of naturalization. Although I argue that we should be agnostic about the truth of the physicalist account of scientific (...) methodology recently used to justify naturalizing theories of intentionality, I show that such accounts are nonetheless important on the more minimal view of theory appraisal that I defend. ;The orthodox philosophical position about scientific theory appraisal is 'methodological physicalism' , which takes scientists to evaluate theories using a 'Physicalist Criterion'. Recent critics of MP have offered an alternative view of scientific theory appraisal which I call 'explanationism' . This position claims that scientific theories are only evaluated by their properties within their own domain of inquiry. Using E, these critics attack the projects pursued by supporters of MP, such as naturalizations, as philosophical impositions upon the sciences. ;To illuminate this debate I examine the relationships that hold between theories in different scientific domains. I outline an 'abstract' framework for theory appraisal using such interlevel properties, which I call 'minimal appraisal'. I argue that minimal appraisal has an obvious a priori justification which provides a straightforward a priori argument against E. After examining a posteriori historical evidence, I conclude that it supports the a priori argument against E and that we should reject explanationism. Using the same historical evidence I then argue that use of the Physicalist Criterion in explanations of historical cases is presently a 'Third Wheel', superfluous to the best explanation of these cases based upon minimal appraisal. I conclude that we should be agnostic about the truth of MP as an account of scientific practice. Finally, I argue that minimal appraisal leaves a methodological role for naturalizing theories of belief content, as a historically common form of vindicatory scientific theory. (shrink)

Margaret Crosland argues that it was the Marquis de Sade, infamous for dominating women, who was in fact dominated by women. The important people in his life, those with whom he had direct contact, and who gave him friendship and support, were women; he knew the men important to him mostly indirectly, through their books. Crosland makes the case that de Sade's writing is often discounted due to an overly literal reading of his work, and that his writings remain an (...) important place to see the principles of materialism worked out to one kind of logical extreme. Crosland's essay additionally serves as a brief overview of the changes in de Sade's writing over the course of his life. (shrink)

Physicalist theories of science, theories of science that is which take physics to be the one basic science and which hold all other sciences to be reducible to physics, have thus far failed to provide a defensible account of cause, state, natural law and explanation. Physicalism has so far been confined to using traditional empiricist concepts of these features of theories. ;This dissertation formally constructs new concepts of scientific explanation by a theory, law of a theory and state description of (...) a theory along lines acceptable to physicalists and indeed modeled on actual physical practice. It differs most noticably from standard empiricist accounts by taking a state description of an individual of a theory to be an exhaustive description of the individual in terms of the predicates of the theory and then demanding that the laws of the theory, taken together, allow us to generate new state descriptions for systems of individuals for regions of space and time in which the system evolves independently of external influences. The status of laws as laws is here no longer regarded in the traditional empiricist way as a function solely of their grammatical form and their truth. Instead lawlikeness is granted to laws in virtue of their membership in a system of laws, the system having the property of generating appropriate sets of new state descriptions. ;Further developments show that more than one system of laws can accomplish the same end result. Three systems of laws are studied in detail. They correspond to the systems of mechanistic laws, of conservation laws, and of force laws in classical physics. Algorithms are given for generating the latter two from the set of mechanistic laws. ;Finally, the physicalist doctrine of the final reducibility of all sciences to physics is embodied in a second type of system of laws which correlates state descriptions of a lower level with ones of a higher level . This second type thus comprises the principles of redescription by which the ontology of a higher level science is reduced to that of a lower. (shrink)

Carlston looks at the problem of nationalization of industries as a problem in organization arising with the increasing interdependence of national economies. He uses this as a "hard case" through which to study the structure of world society, the motivating values of action in world society, and the role of law as an organizing process in that society. By exploring this "hard case" Carlston hopes to clarify basic concepts, justify a new theoretical approach to international law, and point out the (...) basic deficiencies of legal positivism as a philosophy of international law. This book should prove a landmark in the philosophy of international law.--W. G. E. (shrink)

Leibniz' General Investigations, a group of memoranda on logical and methodological matters, remained unpublished until Couturat published the original Latin manuscript in 1903. Only after 1960 was a German translation made by F. Schmidt and an English translation by G. H. R. Parkinson. The present translation provides extensive reference notes to Leibniz' other manuscripts, and a commentary and notes to the text. In these respects it has some advantages over previous translations. The translation is clear although the work itself is (...) sometimes difficult to follow and the notes are most welcome. An introduction discusses the place of the General Investigations within the context of Leibniz' thought. With the interest in Leibniz' logical writings very strong at present, this new translation and commentary is most welcome.--R. H. K. (shrink)

The issues treated in this book derive a certain degree of unification from their relation to the general theme of the completeness of scientific theories. Unfortunately, when a philosopher addresses himself to the question of the completeness of an empirical theory, it is far from clear at the outset just what the problem is. Schlegel, to be sure, explicates three different notions of completeness which may be relevant here: the logical, physical, and pragmatic aspects. By the first, Schlegel means the (...) usual set of issues having to do with the deductive and semantic structure of formal theories, the second refers to "the problems that are to be answered in terms of what is discovered by science about the natural world," and the third refers to "the factors in the completeness of science that seem to be chiefly dependent on the interests of scientists." As these formulations suggest, the level of logical and philosophical rigor is hardly commensurate with the kind of investigation one would expect. An early chapter deals with an epistemology of physics in which a class of entities called "constructs" plays the central role. Unfortunately, it is never clear whether constructs denote objects, properties, facts, sentences, or something else. On the other hand, the materials in this chapter are largely irrelevant to the subsequent discussion. Schlegel does an admirable job of scientific exegesis on the present state of quantum physics and cosmology. With regard to the former, he is an advocate of the "Copenhagen view," and he argues that a sort of natural limit of description and explanation has been reached. As to cosmology, Schlegel looks forward to a narrowing of the range of alternate theories as more data become available. In the chapter on purely formal questions a number of oversights seem to have been committed. The exposition of Gödel's incompleteness theorem is inaccurate in that it is not shown that provability can be defined intra-systematically. Schlegel's discussion of how the theorem might apply to scientific theories is suggestive, but also confusing. The chapter on infinity treats the continuum hypothesis as a proven fact, thus ignoring the very important questions raised by the work of Paul Cohen and others. Finally, and most distressingly, the Hebrew letter aleph is printed upside down at all of its occurrences.--H. P. K. (shrink)