Anti-Realism about Laws

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)

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)

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)

The view that takes laws of nature to be essentially nothing more than descriptions of facts is still rather popular. The present article, on the contrary, defends the claim that the only real motivation for defending a descriptive view of laws—the quest for ontological parsimony—entails too high a price to pay in philosophical terms. It is argued that nomic primitivism, namely the alternative option that takes laws to be primitive fundamental entities in our ontology, is decisively more appealing, since it (...) is the crucial role assigned to laws that makes a scientific theory of natural phenomena a system rather than a list. Finally, the implications that nomic primitivism might have for the issue of the status of the wave function in that particular formulation of quantum mechanics known as Bohmian mechanics are considered. (shrink)

In this paper I argue against Nancy Cartwright's claim that we ought to abandon what she calls "fundamentalism" about the laws of nature and adopt instead her "dappled world" hypothesis. According to Cartwright we ought to abandon the notion that fundamental laws apply universally, instead we should consider the law-like statements of science to apply in highly qualified ways within narrow, non-overlapping and ontologically diverse domains, including the laws of fundamental physics. For Cartwright, "laws" are just locally applicable refinements of (...) a more open-ended concept of capacities. By providing a critique of the dappled world approach's central notion of open ended capacities and substituting this concept with an account of properties drawn from recent writing on the subject of structural realism I show that a form of fundamentalism is viable. I proceed from this conclusion to show that this form of fundamentalism provides a superior reading of case studies, such as the effective field theory program in quantum field theory, than the "dappled world" view. The case study of the EFT program demonstrates that ontological variability between theoretical domains can be accounted for without altogether abandoning fundamentalism or adopting Cartwright's more implausible theses. (shrink)

I develop a metaphysical position that is both lawless and anti-Humean. The position is called realist lawlessness and contrasts with both Humean lawlessness and nomological realism – the claim that there are laws in nature. While the Humean view also allows no laws, realist lawlessness is not Humean because it accepts some necessary connections in nature between distinct properties. Realism about laws, on the other hand, faces a central dilemma. Either laws govern the behaviour of properties from the outside or (...) from the inside. If the former, an unacceptable quidditist view of properties follows. But no plausible account of laws within properties can be developed that permits a governing role specifically for laws. I conclude in favour of eliminativism about laws. At the conceptual core, the notion of a law in nature is misleading. It is suggestive of an otherwise static world in need of animation. (shrink)

Nancy Cartwright's charge against horizontal reductionism leads to a claim about how the world is, namely "dappled." By proposing a simple thought-experiment, I show that Cartwright's division of the world into "nomological" machines and "messy" systems for which no law applies is meaningless. The thought-experiment shows that for a system, having the property of being a nomological machine depends on what kind of questions you ask about it. No metaphysical conclusion about the world being unruly or not can be drawn (...) from a division that is question-dependent. Moreover, I argue that this predicament undermines Cartwright's attempt to provide an illustration of how bad metaphysics of science translates into bad scientific methodologies and policies. (shrink)

In her 1983 work How the Laws of Phyiscs Lie [1] Nancy Cartwright argued for antirealism about fundamental laws alongside realism about phenomenological laws. Her position was considerably altered by 1989 when, in Nature's Capacities and Their Measurement [2], she argued for a realist construal of capacities (close relations of Powers, natures, tendencies, propensities and disptısitions), which she took fundamental laws to be about. Most realists about capaeities, and their ilk, are realist about fundamental laws as well. However this is (...) not true of Cartwright. In [2] she emphatically reaffirmed her antirealism about fundamental laws, stating that 'fundamental laws are not true, nor nearly true, nor true for the most part' [2, p.175]. In 'So the Laws of Physics Needn't Lie' [4] Chalmers argues that Cartwright's advocacy of realism about Nature's capacities in [2] undermines her antirealism about fundamental laws. He accuses Cartwright of apparent contradictions in her position as articulated in [2]. Given Chalmers' reading of Cartwright, an appearance of contradiction does seem to arise. Against Chalmers, I advocate an alternative reading of Cartwright, which is much more charitable to her. This alternative reading of Cartwright has the advantage of avoiding the charge of contradiction. Indeed, if this reading is accepted, the appearance of contradiction, that Chalmers taxeses Cartwright with, does not even arise. A further virtue of this reading of Cartwright is that it is consistent with Cartwright's more recent writing, as I will show. (shrink)

One of the points of principle made by Cartwright is that the fundamental laws do not describe reality because they are always employed together with ceteris paribus clauses, the implication being that ceteris paribus assumptions always have dire consequences. We here wish to offer a dynamical interpretation of ceteris paribus laws in terms of their stability or fragility. On this interpretation, the consequences of ceteris paribus assumptions become concretely dependent on the nature of the laws under consideration and cannot be (...) decided in a blanket fashion a priori. Using insights from nonlinear dynamical systems theory, we shall put forward the idea that any assumption of the general validity or invalidity of ceteris paribus laws amounts to a stability or fragility assumption, respectively. We shall then argue that it is in certain cases possible to relativise the consequences of ceteris paribus assumptions in a concrete way. We shall also indicate briefly how the same principle applies to Cartwright's arguments concerning composition of causes and approximations. Overall, our intention is to suggest a framework within which Cartwright's intuitions about the fundamental laws of physics could be grounded. (shrink)