In lieu of an abstract, here is a brief excerpt of the content:Philosophy and Rhetoric 34.2 (2001) 93-112 [Access article in PDF] Enthymemes, Common Knowledge, and Plausible Inference Douglas Walton The study of enthymemes has always been regarded as important in logic, critical thinking, and rhetoric, but too often it is the formal or mechanistic aspect of it that has been in the forefront. This investigation will show that there is a kind of plausibilistic script-based reasoning, of a kind (...) that has mainly been studied in artificial intelligence, that should have a much more important role to play in the study of enthymemes. But then curiously, as will also be shown, this plausibilistic type of reasoning was familiar in the ancient world, to the Sophists, as well as to leading philosophers such as Plato and Aristotle. By linking this ancient notion of plausibility to the modern notion used in computer science, this investigation reveals an important basis for the enthymeme that has a type of logical structure in its own right, but also has an informal aspect.An enthymeme, in current usage, is an argument that has one or more premises, or possibly a conclusion, not explicitly stated in the text, but that needs to have these propositions explicitly stated to extract the complete argument from the text. Sometimes enthymemes are described as arguments with "missing premises." That vocabulary is awkward, however, because the nonexplicit statement that needs to be added can be a conclusion, at least in a minority of cases. To make the exposition below smoother, the term nonexplicit assumption will be used to cover either the case of a nonexplicit premise or that of a nonexplicit conclusion. The problem with enthymemes is that if the nonexplicit assumptions in an argument are supposed to be propositions used by the arguer (as opposed to just the propositions needed to make the argument structurally correct, according to some standard), reasonable people can have differences of opinion on what the nonexplicit assumptions are supposed to be. The problem is that filling in the missing parts of enthymemes depends on interpreting the natural language [End Page 93] in which the argument was put forward to try to determine what the speaker meant to say.The solution to the problem comes through the recognition that enthymemes rest not only on formal (structural) criteria, but also on informal criteria. One of the most important of these informal criteria is something often called "common knowledge" (Govier 1992; Freeman 1995). But as shown below in a set of selected case studies of enthymemes, "common knowledge" is not really a kind of knowledge at all. It is really plausibility, or eikos, something well known in the ancient world and often misleadingly translated as "probability." Curiously, Aristotle's original doctrine of the enthymeme was based on this notion of plausibility. This historical fact has often been a source of puzzlement and confusion, and sometimes it has even been taken to indicate a defect or contradiction in Aristotle's treatment of the enthymeme. However, the goal of this investigation is not primarily historical. It is to work out one of the most important required steps toward a solution to the problem of enthymemes. But to do this, it is necessary to come back to the ancient notion of plausible inference. 1. The problem with enthymemes Once you have any formal theory of inference, like syllogistic, for example, you will be confronted by cases of arguments in everyday discourse that meet all the requirements for a structurally correct inference except that some part or parts, usually a premise or a conclusion, is missing. By "missing" is meant that the proposition in question has not been explicitly stated in the text of discourse, even though it may be clear enough that the speaker (writer) was relying on it, or including it, as part of the argument. The classic example is the following inference: All men are mortal; therefore, Socrates is mortal. To evaluate such an argument, surely some account of the "hidden" or "missing" assumption needs to be taken. The problem with enthymemes (Burke 1985; Gough and Tindale 1985; Hitchcock 1985) is that, if given carte... (shrink)

The paper considers contemporary models of presumption in terms of their ability to contribute to a working theory of presumption for argumentation. Beginning with the Whatelian model, we consider its contemporary developments and alternatives, as proposed by Sidgwick, Kauffeld, Cronkhite, Rescher, Walton, Freeman, Ullmann-Margalit, and Hansen. Based on these accounts, we present a picture of presumptions characterized by their nature, function, foundation and force. On our account, presumption is a modal status that is attached to a claim and has (...) the effect of shifting, in a dialogue, a burden of proof set at a local level. Presumptions can be analysed and evaluated inferentially as components of rule-based structures. Presumptions are defeasible, and the force of a presumption is a function of its normative foundation. This picture seeks to provide a framework to guide the development of specific theories of presumption. (shrink)

One of Tocqueville’s best-known empirical claims in Democracy in America is that there is no national-level public administration in the United States. He asserts definitively and repeatedly that “administrative centralization does not exist” there. However, in scattered passages throughout the text, Tocqueville points to multiple federal agencies that contemporary historians and APD scholars characterize as instances of a growing national administrative system, such as the Post Office Department and the Bureau of Indian Affairs. I reevaluate Tocqueville’s treatment of bureaucracy in (...) America in light of this evidence. I contend that Tocqueville, perhaps in spite of himself, reveals even the most paradigmatic examples of active, democratic self-government in Democracy in America—townships and other voluntary associations—to be embedded in and causally supported by a network of interrelated, centralized public administrative institutions. Crucially, Tocqueville never resolves the tension between his acknowledgment of the causal power of these institutions and his claims that they do not exist. This new picture of the empirical and normative complexity of Tocqueville’s treatment of bureaucratic institutions offers a rich set of conceptual resources for contesting, among other claims, the political construction of nostalgia for a lost age of do-it-yourself White settler democracy in a time before bureaucracy in America. (shrink)

The theory of apartness spaces, and their relation to topological spaces (in the point–set case) and uniform spaces (in the set–set case), is sketched. New notions of local decomposability and regularity are investigated, and the latter is used to produce an example of a classically metrisable apartness on R that cannot be induced constructively by a uniform structure.

This article studies institutional investor allocations to the socially responsible asset class. We propose two elements influence socially responsible institutional investment in private equity: internal organizational structure, and internationalization. We study socially responsible investments from Dutch institutional investments into private equity funds, and compare socially responsible investment across different asset classes and different types of institutional investors (banks, insurance companies, and pension funds). The data indicate socially responsible investment in private equity is 40–50% more common when the decision to implement (...) such an investment plan is centralised with a single chief investment officer. Socially responsible investment in private equity is also more common among institutional investors with a greater international investment focus, and less common among fund-of-fund private equity investments. (shrink)

We examine a contribution L. Susan Stebbing made to the understanding of critical thinking and its relation to formal logic. Stebbing took expertise in formal logic to authorise logical intervention in public debate, specifically in assessing of the validity of everyday reasoning. She held, however, that formal logic is purely the study of logical form. Given the problems of ascertaining logical form in any particular instance, and that logical form does not always track informal validity, it is difficult to see (...) how she could justify her belief in logical interventionism. Her answer to this problem is the contribution we explore here. It involves the view that although the logician’s expertise is not sufficient to assess arguments made in everyday contexts on its own, it nevertheless plays a unique role in giving systematicity and direction to the critique of such arguments, in particular, in public debate. (shrink)

In their Target Article, “Promoting Ethical Payment in Human Infection Challenge Studies,” Lynch et al. propose a framework for ethical payment to research participants and apply it to the c...

In a critical study of some recent action theory Professor James Tomberlin [7] makes some insightful and suggestive remarks concerning the by now well known problem of "Smith and the airplane" formulated by Keith Lehrer and Richard Taylor [3]. While these remarks do significantly advance our knowledge of the nature of the problem, I would like to try to show why the strategy they indicate does not lead to a solution that represents any improvement on the one developed in [1], (...) [8] and [2].The problem of Smith and the airplane is posed by the following apparent inconsistency. Suppose it is now shortly before 3:30 and Smith is at a country airport. The 3:30 plane is the only possible means whereby Smith can arrive at the city at 4:00. There is nothing to prevent Smith from leaving on the 3:30 plane, but he in fact does not do so: Then each of the following statements are true. (shrink)

An axiomatic development of the theory of apartness and nearness of a point and a set is introduced as a framework for constructive topology. Various notions of continuity of mappings between apartness spaces are compared; the constructive independence of one of the axioms from the others is demonstrated; and the product apartness structure is defined and analysed.

The Encyclopedia of Organ includes articles on the organ family of instruments, including famous players, composers, instrument builders, the construction of the instruments, and related terminology. It is the first complete A-Z reference on this important family of keyboard instruments. The contributors include major scholars of music and musical instrument history from around the world.

This annotated bibliography comprehensively covers the entire range of international English-language philosophy serials. Over 300 citations represent serials that are especially instrumental in philosophical research and development. The entries are arranged alphabetically by title for rapid use and are fully annotated. Each entry includes detailed information about publishers, prices, circulation, manuscript selection, indexes and abstracts, target audiences, and acceptance rates. In addition, the annotations evaluate critically the strengths and weaknesses of the serial as it substantially impacts philosophy and its related (...) disciplines. The Guide also includes an extensive subject index and a geographical index. (shrink)

This title is part of UC Press's Voices Revived program, which commemorates University of California Press’s mission to seek out and cultivate the brightest minds and give them voice, reach, and impact. Drawing on a backlist dating to 1893, Voices Revived makes high-quality, peer-reviewed scholarship accessible once again using print-on-demand technology. This title was originally published in 1986.

This paper examines the impact of the introduction of Western (European) technical civilization on regional cultures in Nigeria, using Igboland in South-EasternNigeria as a test case. It begins with a discussion of some general features of Western technical civilization whose evolution has been profoundly influenced by technological advances in Europe and her cultural colonies in North America and elsewhere. Consequences of the contact between Western technical civilization and traditional Igbo culture are also examined. The paper concludes by discussing the challenging (...) problem of Africa’s contribution to technical civilization. (shrink)

Financial crises have become an all-too-common occurrence over the past twenty years, largely as a result of changes in finance brought about by increasing internationalization and integration. As domestic financial systems and economies become more interlinked, weaknesses can significantly impact not only individual economies but also markets, financial intermediaries and economies around the world. This volume addresses the twin objectives of financial development in the context of financial stability and the role of law in supporting both. Financial stability (frequently seen (...) as the avoidance of financial crisis) has become an objective of the international financial architecture as well as individual economies and central banks. At the same time, financial development is now seen to play an important role in economic growth. In both financial stability and financial development, law and related institutions have a central role. (shrink)

It is shown within Bishop's constructive mathematics that, under one extra, classically automatic, hypothesis, a continuous homomorphism from R onto a compact metric abelian group is periodic, but that the existence of the minimum value of the period is not derivable.