Anti-Realism about Laws

One common feature of debates about the best metaphysical analysis of putatively lawful phenomena is the suspicion that nomic realists who locate the modal force of such phenomena in quasi-causal necessitation relations between universals are working with a model of law that cannot convincingly erase its theological pedigree. Nancy Cartwright distills this criticism into slogan form: no God, no laws. Some have argued that a more plausible alternative for nomic realists who reject theism is to ground laws of nature in (...) the fundamental dispositional properties or “pure powers” of physical objects. This article argues that for all its advantages over deflationary and rival realist accounts, a pandispositionalist account of law cuts against the commitment to metaphysical naturalism that its supporters almost always presuppose. It then examines and rejects a Platonic version of this account before elaborating and advancing a theistic alternative that is more theoretically powerful and more metatheoretically parsimonious. In slogan form: no God, no powers. (shrink)

A highly influential position in the debate between nomological realists and antirealists is the regularist theory of laws. Its main feature is the defense of a humean metaphysics which denies the existence of real causal powers and necessary connections in nature. Regularism, however, rely on a traditional reading of Hume’s philosophy. In this paper we aim to revisit the discussion around laws of nature in light of nontraditional interpretations of his work, often labeled as the ‘New Hume’.

One might view the literature on laws of nature as dividing into two camps: the “metaphysical” advocates of laws as objective realities beyond any actual regularities, and the “antimetaphysical” skeptics. Hard-liners in both camps will find much to disagree with in Marc Lange’s Natural Laws in Scientific Practice. I mean that as a compliment to Lange’s work.

The topic of laws of nature provides a kind of Rorschach test for philosophy. Some philosophers see in laws only Humean regularities; others see a kind of physical necessity; others see a necessity closer to logical necessity; others see expressions of causal powers; others see inference tickets; still others see relations between universals; ... ; and some see only a messy inkblot. We can also perform a meta-Rorschach test on the results of the first test. When van Fraassen and I (...) submit ourselves to this meta-test we both recoil with shock and horror. Where we differ is in drawing morals from this un- pleasant experience. For me the opprobrium falls mainly on the way philos- ophy is practiced. For van Fraassen, the disgrace also touches the practice, but for him the source is the rottenness of the concept of laws. (shrink)

This book on the philosophy of science argues for an empiricism, opposed to the tradition of David Hume, in which singular rather than general causal claims are primary; causal laws express facts about singular causes whereas the general causal claims of science are ascriptions of capacities or causal powers, capacities to make things happen. Taking science as measurement, Cartwright argues that capacities are necessary for science and that these can be measured, provided suitable conditions are met. There are case studies (...) from both econometrics and quantum mechanics. (shrink)

Nancy Cartwright has drawn attention to how explanations are actually given in mathematical sciences. She argues that these procedures support an antirealist thesis that fundamental explanatory laws are not true. Moreover, she claims to be be essentially following Duhem's line of thought in developing this thesis. Without wishing to detract from the importance of her observations, it is suggested that they do not necessarily require the antirealist thesis. The antirealist interpretation of Duhem is also disputed. It is argued that Duhemian (...) points, often understood antirealistically, bear a realist construal, and that antirealist interpretations of Duhem typically run into problems of consistency or of reducing his position to absurdity. (shrink)

Many philosophers (such as, for instance, Nancy Cartwright, Brian Ellis, and Hartry Field) regard scientific practice as the final arbiter in ontology. In this short paper, I argue that the very philosophers who profess to derive their ontological commitments from scientific practice impose certain views on the theories established by that practice that the practice itself does not support. This is not consistent with their view that science tells us what there is.

Building upon Nancy Cartwright's discussion of models in How the Laws of Physics Lie, this paper addresses solid state research in transition metal oxides. Historical analysis reveals that in this domain models function both as the culmination of phenomenology and the commencement of theoretical explanation. Those solid state chemists who concentrate on the description of phenomena pertinent to specific elements or compounds assess models according to different standards than those who seek explanation grounded in approximate applications of the Schroedinger equation. (...) Accurate accounts of scientific debate in this field must include both perspectives. (shrink)

SummaryThere are two rival ways in which events in the world can be explained: the covering law way and the dispositionalist way. The covering law model, which takes the law of nature as its fundamental explanatory unit, faces a number of renown difficulties. Rather than attempt to patch up this approach, the alternative dispositionalist strategy is recommended. On this view, general facts are dependent upon particular facts about what things do, rather than vice versa. This way of viewing the world (...) is not only more intuitive but also handles some of the notorious problems faced by laws; such as those of probabilistic and unrealized facts. The dispositionalist strategy faces its own difficulties of explaining generality and contingency of behaviour. It is shown, however, that at least these difficulties should not dissuade the dispositionalist. The prospects for a convincing dispositionalist ontology to replace one based on laws of nature are thus healthy. (shrink)

Whether nature is or is not systematic sounds at first like an idle metaphysical question, but considered in relation to the aims of science and the methods of appraisal of scientific theories, it can be given clear content. It is also necessary to ask the question in order to study the relation of causation, laws of nature, and theoretical structure. ; Aims. The doctrines that science aims to provide explanations, that science achieves success in this aim, that explanation involves unification, (...) and that the principles on which explanations, properly so-called, are based, must be true, together imply that nature is a system. For a kind of explanation she calls "causal", Nancy Cartwright affirms , and but denies ; for a kind of explanation she calls "theoretical", Cartwright affirms , and but denies . I show by historical examples that Cartwright's distinction between "theoretical" and "causal" explanation is often impossible to make out. I show, largely through discussions of Galileo and Newton, that Cartwright has a misleading view of the role of idealization in physical science, a view apt perhaps for physics before Newton, but not for Newtonian physics. I use my historical case studies to undermine numerous specific sceptical arguments by which Cartwright supports her novel conception of "theoretical" explanation. ; Methods. I argue that the Newtonian, "bootstrap" method in terms of which Cartwright reconstructs low-level experiment- and measurement-based inferences to specific causal conclusions has its clearest and most cogent applications in inferences to high-level theoretical conclusions. Newton's method, however, presupposes that nature is a system. Nature must be systematic in order to be well suited to study by the bootstrap method. I argue that the method has been notably successful, and that it consequently is appropriate to assimilate the method's substantive presupposition concerning natural systematicity to what has been learned from the experience of the method's successful application, and to say that we have evidence that this presupposition is true, that is, evidence that nature is systematic. ; Causation, Laws, and Theory. Against Cartwright I defend a top-down, anti-metaphysical conception of this relation, and an "internal realist" conception of theoretical structure. By highlighting some facets of the mathematics appertaining to fundamental physical laws presumed true, I argue that certain phenomena concerning scientific practice from which Cartwright's metaphysical view of causes gains apparent strength in fact are conformable to my own account. (shrink)

One of Nancy Cartwright's arguments for entity realism focuses on the non-redundancy of causal explanation. In How the Laws of Physics Lie she uses an example from laser theory to illustrate how we can have a variety of theoretical treatments governing the same phenomena while allowing just one causal story. In the following I show that in the particular example Cartwright chooses causal explanation exhibits the same kind of redundancy present in theoretical explanation. In an attempt to salvage Cartwright's example (...) the causal explanation could be reinterpreted as a capacity claim, as outlined in her recent work Nature's Capacities and Their Measurement. However, I argue that capacities cannot be isolated in the way that Cartwright suggests and consequently these capacity claims also fail to provide a unique causal story. We can, however, make sense of capacities by characterizing them in a relational way and I offer some ideas as to how this approach would retain our intuitions about capacities while denying their ontological priority as dormant powers. (shrink)

Dispositionalist accounts of scientific laws are currently at the forefront of discussions in the metaphysics of science. However, Mumford has presented such accounts with the following dilemma: if laws are to have a governing role, then they cannot be grounded in the relevant dispositions; if on the other hand, they are so grounded, then they cannot perform such a role. Mumford’s solution is drastic: to do away with laws as metaphysically substantive entities altogether. Dispositionalist accounts are also deficient in that (...) they either make no mention of the significant role of symmetries in science, or attempt to inappropriately eliminate this role. Here we shall attempt to motivate a structuralist view of laws by showing how it evades Mumford’s dilemma and accommodates the role of symmetry principles. In addition we shall consider how this view deals with a number of issues that dispositionalism finds problematic and indicate how the supposed necessity of laws and the explanation of relevant counterfactuals look from this structuralist perspective. (shrink)

I am afraid that Nancy Cartwright and I will have to agree to disagree, on the whole. If my review comes through as harsh, it is perhaps the natural response of a quantum theorist who has worked in economics to a book in which physics and economics are treated as epistemically identical.

Philosophers of science nowadays are inclined to believe in physical laws, but generally, like Hume and Russell, to reject causes. This paper urges the reverse. Explanatory practice in physics argues that we must take literally the causal stories that our theories provide, but the fundamental laws and equations that are essential to modern science are merely instrumental.

(No abstract is available for this citation).

It is often supposed that the spectacular successes of our modern mathematical sciences support a lofty vision of a world completely ordered by one single elegant theory. In this book Nancy Cartwright argues to the contrary. When we draw our image of the world from the way modern science works - as empiricism teaches us we should - we end up with a world where some features are precisely ordered, others are given to rough regularity and still others behave in (...) their own diverse ways. This patchwork makes sense when we realise that laws are very special productions of nature, requiring very special arrangements for their generation. Combining classic and newly written essays on physics and economics, The Dappled World carries important philosophical consequences and offers serious lessons for both the natural and the social sciences. (shrink)