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Barnes, Elizabeth. Arguments Against Metaphysical Indeterminacy and Vagueness
2010, Philosophy Compass 5(11): 953-964.
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Added by: Emily Paul
Abstract: In this paper, I'll examine some of the major arguments against metaphysical indeterminacy and vagueness. Metaphysical accounts of indeterminacy and vagueness have been decidedly unpopular, and this paper examines some of the major reasons for that unpopularity.

Comment: A really useful overview of the alleged problem of metaphysical indeterminacy, and the main arguments against it. Written extremely clearly, but dealing with complex subject matter, so suitable for either an advanced undergraduate or masters class (or a further reading in an intermediate undergraduate class).

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Graff Fara, Delia. Shifting Sands: An Interest-Relative Theory of Vagueness
2000, Philosophical Topics 28(1): 45-81.
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Added by: Emily Paul
Summary: I propose that the meanings of vague expressions render the truth conditions of utterances of sentences containing them sensitive to our interests. For example, 'expensive' is analyzed as meaning 'costs a lot', which in turn is analyzed as meaning 'costs significantly greater than the norm'. Whether a difference is a significant difference depends on what our interests are. Appeal to the proposal is shown to provide an attractive resolution of the sorites paradox that is compatible with classical logic and semantics.

Comment: An important paper to use for an advanced UG Philosophy of Language/Metaphysics course. Would definitely need to be a core reading and be taught in a lecture first, as there are many important things going on here.

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Magidor, Ofra, Stephen Kearns. Epistemicism about vagueness and meta-linguistic safety
2008, Philosophical Perspectives 22 (1): 277-304.
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Added by: Berta Grimau
Abstract: The paper challenges Williamson's safety based explanation for why we cannot know the cut-off point of vague expressions. We assume throughout (most of) the paper that Williamson is correct in saying that vague expressions have sharp cut-off points, but we argue that Williamson's explanation for why we do not and cannot know these cut-off points is unsatisfactory. In sect 2 we present Williamson's position in some detail. In particular, we note that Williamson's explanation relies on taking a particular safety principle ('Meta-linguistic belief safety' or 'MBS') as a necessary condition on knowledge. In section 3, we show that even if MBS were a necessary condition on knowledge, that would not be sufficient to show that we cannot know the cut-off points of vague expressions. In section 4, we present our main case against Williamson's explanation: we argue that MBS is not a necessary condition on knowledge, by presenting a series of cases where one's belief violates MBS but nevertheless constitutes knowledge. In section 5, we present and respond to an objection to our view. And in section 6, we briefly discuss the possible directions a theory of vagueness can take, if our objection to Williamson's theory is taken on board.

Comment: This paper would work well as a secondary reading in a course on vagueness with a section on epistemicism. For instance, the course could present Williamson's as the main proposal within that tradition and then turn to this paper for criticism and an alternative proposal within the same tradition.

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O'Connor, Cailin. The Evolution of Vagueness
2013, Erkenntnis (S4):1-21.
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Added by: Chris Blake-Turner, Contributed by: Cailin O'Connor
Abstract: Vague predicates, those that exhibit borderline cases, pose a persistent problem for philosophers and logicians. Although they are ubiquitous in natural language, when used in a logical context, vague predicates lead to contradiction. This paper will address a question that is intimately related to this problem. Given their inherent imprecision, why do vague predicates arise in the first place? I discuss a variation of the signaling game where the state space is treated as contiguous, i.e., endowed with a metric that captures a similarity relation over states. This added structure is manifested in payoffs that reward approximate coordination between sender and receiver as well as perfect coordination. I evolve these games using a variation of Herrnstein reinforcement learning that better reflects the generalizing learning strategies real-world actors use in situations where states of the world are similar. In these simulations, signaling can develop very quickly, and the signals are vague in much the way ordinary language predicates are vague - they each exclusively apply to certain items, but for some transition period both signals apply to varying degrees. Moreover, I show that under certain parameter values, in particular when state spaces are large and time is limited, learning generalization of this sort yields strategies with higher payoffs than standard Herrnstein reinforcement learning. These models may then help explain why the phenomenon of vagueness arises in natural language: the learning strategies that allow actors to quickly and effectively develop signaling conventions in contiguous state spaces make it unavoidable

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