Although AGM theory contraction (Alchourrón et al., 1985; Alchourrón and Makinson, 1985) occupies a central position in the literature on belief change, there is one aspect about it that has created a fair amount of controversy. It involves the inclusion of the postulate known as Recovery. As a result, a number of alternatives to AGM theory contraction have been proposed that do not always satisfy the Recovery postulate (Levi, 1991, 1998; Hansson and Olsson, 1995; Fermé, 1998; Fermé and Rodriguez, 1998; (...) Rott and Pagnucco, 1999). In this paper we present a new addition, systematic withdrawal, to the family of withdrawal operations, as they have become known. We define systematic withdrawal semantically, in terms of a set of preorders, and show that it can be characterised by a set of postulates. In a comparison of withdrawal operations we show that AGM contraction, systematic withdrawal and the severe withdrawal of Rott and Pagnucco (1999) are intimately connected by virtue of their definition in terms of sets of preorders. In a future paper it will be shown that this connection can be extended to include the epistemic entrenchment orderings of Gärdenfors (1988) and Gärdenfors and Makinson (1988) and the refined entrenchment orderings of Meyer et al. (2000). (shrink)

Epistemic entrenchment, as presented by Gärdenfors and Makinson (1988) and Gärdenfors (1988), is a formalisation of the intuition that, when forced to choose between two beliefs, an agent will giveup the less entrenched one. While their formalisation satisfactorilycaptures the intuitive notion of the entrenchment of beliefs in a number ofaspects, the requirement that all wffs be comparable has drawn criticismfrom various quarters. We define a set of refined versions of theirentrenchment orderings that are not subject to the same criticism, andinvestigate (...) the relationship between the refined entrenched orderings,the entrenchment orderings of Gärdenfors and Makinson, and AGM theorycontraction (Alchourrón et al., 1985). To conclude, we compare refinedentrenchment with two related approaches to epistemic entrenchment. (shrink)

We model three examples of beliefs that agents may have about other agents' beliefs, and provide motivation for this conceptualization from the theory of mind literature. We assume a modal logical framework for modelling degrees of belief by partially ordered preference relations. In this setting, we describe that agents believe that other agents do not distinguish among their beliefs ('no preferences'), that agents believe that the beliefs of other agents are in part as their own ('my preferences'), and the special (...) case that agents believe that the beliefs of other agents are exactly as their own ('preference refinement'). This multi-agent belief interaction is frame characterizable. We provide examples for introspective agents. We investigate which of these forms of belief interaction are preserved under three common forms of belief revision. (shrink)

We introduce and explore the notion of duality for entailment relations induced by preference orderings on states. We discuss the relationship between these preferential entailment relations from the perspectives of Boolean algebra, inference rules, and modal axiomatisation. Interpreting the preference relations as accessibility relations establishes modular Gödel-Löb logic as a suitable modal framework for rational preferential reasoning.

We model three examples of beliefs that agents may have about other agents’ beliefs, and provide motivation for this conceptualization from the theory of mind literature. We assume a modal logical framework for modelling degrees of belief by partially ordered preference relations. In this setting, we describe that agents believe that other agents do not distinguish among their beliefs (‘no preferences’), that agents believe that the beliefs of other agents are in part as their own (‘my preferences’), and the special (...) case that agents believe that the beliefs of other agents are exactly as their own (‘preference refinement’). This multi-agent belief interaction is frame characterizable. We provide examples for introspective agents. We investigate which of these forms of belief interaction are preserved under three common forms of belief revision. (shrink)

Generalisations of theory change involving operations on arbitrary sets ofwffs instead of on belief sets (i.e., sets closed under a consequencerelation), have become known as base change. In one view, a base should bethought of as providing more structure to its generated belief set, whichmeans that it can be employed to determine the theory contraction operationassociated with a base contraction operation. In this paper we follow suchan approach as the first step in defining infobase change. We think of an infobase (...) as a finite set of wffs consisting of independently obtainedbits of information. Taking AGM theory change (Alchourrón et al. 1985) as the general framework, we present a method that uses the structure of aninfobase B to obtain an AGM theory contraction operation for contractingthe belief set Cn(B). Both the infobase and the obtained theory contraction operation then play a role in constructing a unique infobasecontraction operation. Infobase revision is defined in terms of an analogueof the Levi Identity, and it is shown that the associated theory revisionoperation satisfies the AGM postulates for revision. Because every infobaseis associated with a unique infobase contraction and revision operation, the method also allows for iterated base change. (shrink)

A review of Lycan's Book "Consciousness".

The is a reading of Hegel's chapter on teleology in the Science of Logic. It argues that inadequacies in the intentional model of teleology that dominated both pre-Kantian and Kantian thought about teleology force us to recognize a much more Aristotelian conception of natural teleology that must be presupposed to make sense of the teleology of intentions.

This is a careful explication of and commentary on Wilfrid Sellars's classic essay "Empiricism and the Philosophy of Mind" [EPM]. It is appropriate for upper-level undergraduates and beyond. The full text of EPM is included in the volume.

Wilfrid Sellars has been called "the most profound and systematic epistemological thinker of the twentieth century". He was in many respects ahead of his time, and many of his innovations have become widely acknowledged, for example, his attack on the "myth of the given", his functionalist treatment of intentional states, his proposal that psychological concepts are like theoretical concepts, and his suggestion that attributions of knowledge locate the knower "in the logical space of reasons". However, while many philosophers have begun (...) to acknowledge Sellars's inspiration in their work, their interpretation of his thought has not always been the most accurate. His writings are difficult. Individually, his essays are complex and sometimes rely on doctrines and arguments he put forward elsewhere. Each of his articles is deepened and strengthened by seeing it in its systematic context, but he never wrote a unified exposition of his system, which therefore has to be pieced together from numerous disparate sources. Willem deVries addresses these difficulties specifically and provides a careful reading and remarkable overview of Sellars's systematic philosophy that will become the standard point of reference for all philosophers seeking to understand Sellars's hugely significant body of work. (shrink)

Robert Brandom makes several mistakes in his discussion of Sellars's "Two-Ply" account of observation. Brandom does not recognize the difference in "level" between observation reports concerning physical objects and 'looks'-statements. He also denies that 'looks'-statements are reports or even make claims. They then demonstrate a more correct reading of Sellars on 'looks'-statements.

Leading philosophers from both sides of the Atlantic present essays on Wilfrid Sellars's Empiricism and the Philosophy of Mind, one of the crowning achievements of 20th-century analytic philosophy. They discuss empiricism, perception, epistemology, realism, and normativity, showing how vibrant Sellarsian philosophy remains in the 21st century.

For years, Robert B. Brandom has been working on a book on Hegel’s Phenomenology of Spirit. Earlier versions of its chapters were available for scrutiny at Brandom’s website. But the book itself is...

An interpretation of Hegel's Philosophy of Subjective Spirit showing its continued relevance to contemporary issues in the philosophy of mind.

This paper investigates Sellars's complex attitude towards idealism. It distinguishes between the epistemologically-based arguments that led many empiricists to idealism and a different set of more purely metaphysical arguments that came to dominate in German Idealism. Sellars resolutely rejects all of the epistemological arguments for idealism, but shows much greater sympathy with the metaphysical arguments. It is then argued that Sellars introduced his notion of picturing to avoid falling into such an idealism.

This article considers Ruth Millikan's relationship to Robert Brandom and most especially their common influence, Wilfrid Sellars.

An analysis of Hegel's chapter on teleology in the Science of Logic. Hegel argues that the 'intentional model' of teleology assumed by Kant actually presupposes a natural or organic teleology more like along Aristotelian lines.

this essay argues that John McDowell's argument that sensations are a useless 'fifth wheel' in Wilfrid Sellars' philosophy of experience fails.

Though Wilfrid Sellars portrayed himself as a latter-day Kantian, I argue here that he was at least as much a Hegelian. Several themes Sellars shares with Hegel are investigated: the sociality and normativity of the intentional, categorial change, the rejection of the given, and especially their denial of an unknowable thing-in-itself. They are also united by an emphasis on the unity of things—the belief that things do “hang together.” Hegel’s unity is idealist; Sellars’ is physicalist; the differences are substantial, but (...) so are the resonances. (shrink)

This article shows how Hegel's 'Sense-Certainty' chapter fills in a gap in Kant's and Sellars's critique of empiricism by supplying an argument that even indexical reference presupposes and is mediated by a larger conceptual framework.

This essay is a response to Patrick Reider’s essay “Sellars on Perception, Science and Realism: A Critical Response.” Reider is correct that Sellars’s realism is in tension with his generally Kantian approach to issues of knowledge and mind, but I do not think Reider’s analysis correctly locates the sources of that tension or how Sellars himself hoped to be able to resolve it. Reider’s own account of idealism and the reasons supporting it are rooted in the epistemological tradition that informed (...) the British empiricists, rather than in the metaphysical reasons that ruled within the German tradition from Leibniz through Hegel that has much more in common with Sellars’s position. Thus, Reider takes Sellars’s notion of picturing to be just another version of the representationalism that has dominated the Anglo-American tradition since Locke, whereas, in my view, because picturing is a non-semantical relation, it is an important ingredient in naturalizing the coherentist theories of the idealists. (shrink)

An historical introduction to philosophy.

Sellars was committed to the irreducibility of the semantic, the intentional, and the normative. Nevertheless, he was also committed to naturalism, which is prima facie at odds with his other theses. This paper argues that Sellars maintained his naturalism by being linguistically pluralistic but ontologically monistic . There are irreducibly distinct forms of discourse, because there is an array of distinguishable functions that language and thought perform, but we are not ontologically committed to the array of apparently non-natural entities or (...) relations mentioned in the metalanguage. However, there is an underlying relation between language and world presupposed by all empirically meaningful language. In his early work Sellars sought to describe this relation in linguistic terms as a form of 'pure description', but inadequacies in that notion drove him towards the naturalistic relation between language and world that he came to call 'picturing'. (shrink)

AT Sophist 255b7-e the Eleatic Stranger gives two arguments, one to show that being and identity are not the same, and one to show that being and otherness are not the same. Scholars have not paid them particularly close attention, but it seems generally agreed that the two arguments are quite different. In this paper I shall offer an interpretation which shows that the two arguments, though superficially quite different, are intrinsically and importantly related. Specifically, in the first argument the (...) Stranger elicits an obvious falsehood from the hypothesis that being and identity are the same. I claim that in order to distinguish being and otherness an exactly parallel argument could have been given instead of the second argument we actually find. However, there are sound dramatic reasons why this was not done, for in this case the falsehood would not be obvious. Instead, the argument we are given takes us deeper and analyzes the source of the falsehood by introducing a distinction between absolute and relative uses of"being.". (shrink)

A summary of the "Rylean myth" (aka "the myth of Jones") from Wilfrid Sellars' classic article "Empiricism and the Philosophy of Mind." He uses this "myth" to motivate the idea that our concepts of mental states are like theoretical concepts, developed to fulfill an explanatory role, and not at all somehow 'given' to us by direct acquaintance with instances of mental states.

This chapter contains sections titled: Quine, the Dogmas, and Sellars The Transcendental Argument for Sense Impressions Are Sense Impressions Casually Idle? A Sideways‐On View from Nowhere Sensation and the Phenomenology of Perception Concluding Remarks Notes References.

ABSTRACTI have claimed previously that Hegel and Sellars are both, in the end, monistic visionaries, though with radically different visions of the grand unity of things. In this paper I explain an...

Pragmatism has ties to Idealism; it has even been accused of being a form of idealism. I tell a story about the changing nature of idealism that makes sense of its relationship to pragmatism without threatening to collapse the two. My story is a genealogy that begins well before pragmatism shows up. Pragmatism has very little in common with the subjective idealism of Berkeley or the problematic idealism of Descartes; the differences between idealism and pragmatism get blurred only because idealism (...) underwent an evolution transforming it into something primed to influence and maybe bleed into pragmatism. It was, according to my story, the evolved idealism developed in Germany between 1781 and 1831 that contributed to the formation and development of pragmatism. Yet pragmatism is a large evolutionary step away from idealism, however much it retains and utilizes some of the strengths of late idealistic thought. (shrink)

A refutation of claims by, e.g., Hamlyn or Soll, that Hegel denies our ability to refer to or knowledge individual objects.

At the University of Pretoria, Historical Theology consists of various sub-disciplines, that is, History of Christianity, History of Doctrine, History of Theology, History of Missions, Church History, and Church Polity. This article is located in History of Missions, as a contribution to the centenary celebration of the Maranatha Reformed Church of Christ (MRCC). The main focus of this contribution is an analysis of Prof. P.S. Dreyer’s mission theology as reflected in his publications, and how it shaped the mission policy of (...) the Nederduitsch Hervormde Kerk van Afrika (NHKA) and the growth of the MRCC. For 35 years (1954–1989), Prof. Dreyer was a member and chairman of the Mission Board of the NHKA. As part-time Superintendent of Mission and chairman of the Board, he not only had many administrative and financial responsibilities, but he also played a role in the establishment of at least 60 congregations in black communities, as well as the theological education of more than 200 MRCC students and ministers. All of this was based on a clear understanding of the nature of the church, as well as the responsibility and calling of the church to proclaim Jesus Christ to all people. Contribution: This article addressed the role of theology and individual theologians in the history of the church and mission in South Africa, and how it impacted upon the relationship between different race groups and the development of an indigenous Christianity. (shrink)

A dialogue between someone who finds Sellars's Rylean myth in "Empiricism and the Philosophy of Mind" quite implausible and another who defends it.

For years, Robert B. Brandom has been working on a book on Hegel’s Phenomenology of Spirit. Earlier versions of its chapters were available for scrutiny at Brandom’s website. But the book itself is...

A summary of Sellars' argument that the Given is a myth--there is no such thing as a given in our knowledge.

This paper shows that the resources mobilized by recent arguments against individualism in the philosophy of mind also suffice to construct a good argument against a Humean-style skepticism about our knowledge of extra-mental reality. The argument constructed, however, will not suffice to lay to rest the attacks of a truly global skeptic who rejects the idea that we usually know what our occurrent mental states are.