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It continues to be alleged that superluminal in uences of any sort would be inconsistent with special relativity for the following three reasons: they would imply the existence of a ‘distinguished’ frame; they would allow the detection of absolute motion; and they would violate the relativity of simultaneity. This paper shows that the first two objections rest upon very elementary misunderstandings of Minkowski geometry and on lingering Newtonian intuitions about instantaneity. The third objection has a basis, but rather than invalidating (...) |
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Relativity theory is often said to support something called ‘the four-dimensional view of reality’. But there are at least three different views that sometimes go by this name. One is ‘spacetime unitism’, according to which there is a spacetime manifold, and if there are such things as points of space or instants of time, these are just spacetime regions of different sorts: thus space and time are not separate manifolds. A second is the B-theory of time, according to which the (...) |
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Sider (2001) and Hawley (2001) argue that, in order to account for the mere possibility of change, temporal parts must be as fine-grained as possible change, and hence as fine-grained as time. However, when dealing with metaphysical possibility, the fine-grainedness of actual time and the fine-grainedness of possible change can come apart. Once this is taken into account, we see that, on certain assumptions about the actual microstructure of time, the modal arguments of Sider and Hawley lead to the problematic (...) |
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Timelines is an inquiry into the nature of time, both as an apparent feature of the external physical world and as a fundamental feature of our experience of ourselves in the world. The principal argument of Timelines is that our coventional ideas about time are largely mistaken and that what we think of as independent physical time is actually our calibration of a certain relation between events. Namely, the relation between time-keeping events and the causal sequential differences of physical processes (...) |
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Mereotopology is a theory of connected parts. The existence of boundaries, as parts of everyday objects, is basic to any such theory; but in classical mereotopology, there is a problem: if boundaries exist, then either distinct entities cannot be in contact, or else space is not topologically connected . In this paper we urge that this problem can be met with a paraconsistent mereotopology, and sketch the details of one such approach. The resulting theory focuses attention on the role of (...) |
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According to the presentist, it is always the case that the only existing objects are those that exist at the present time, and the only properties and relations that are instantiated are those that are instantiated at the present time. The truth-supervenes-on-being thesis (TSB) is that there can be no difference in what is true without a corresponding difference in what exists and in what properties and relations are instantiated. The truth-supervenes-on-being objection says that presentism cannot accommodate TSB. Lucretianism is (...) |
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Objects often manifest themselves in incompatible ways across perspectives that are epistemically on a par. The standard response to such cases is to deny that the properties that things appear to have from different perspectives are properties that things really have out there. This type of response seems worrying: too many properties admit of perspectival variance and there are good theoretical reasons to think that such properties are genuinely instantiated. So, we have reason to explore views on which things can (...) |
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We review the current situation in the philosophy of time, partly to investigate Michael Dummett’s complaint that the philosophy of physics has become too specialized and technical to be able to communicate with mainstream philosophy. We conclude that the situation in this case is different: there is no special difficulty of intelligibility---the obstacle for communication between science and philosophy here is rather that what physics, or science in general, tells us is prima facie in conflict with common sense and intuition. (...) |
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Traynor identifies a tension between armchair reasoning telling us about the mereological structure of objects and empirical investigation telling us about the structure of spacetime. Section 1 explains, and bolsters, that tension. Section 2 discusses Traynor's resolution, and suggests some possible problems with it, whilst Section 3 discusses an alternative. |
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