temporal parts - plato article

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Temporal Parts  First published Sun Feb 1, 2004; substantive revision Fri Oct 1, 2004 Material objects extend through space b y having different spatial parts in different places. But how do they persist through time? According to some philosophers, things have temporal parts as well as spatial parts: accepting this is supposed to help us solve a whole bunch of metaphysical problems, and keep our philosophy in line with modern physics. Other philosophers disagree, arguing that neither metaphysics nor physics give us good reason to believe in temporal parts. 1. Introduction 2. What are Temporal Parts, and Which Things are Supposed to Have Them? 3. Change 4. Coincidence 4.1 Temporary Coincidence 4.2 Permanent Coincidence 5. Vagueness 6. Time and Temporal Parts 7. Special Relativity and Temporal Parts 8. Relations between Temporal Parts 9. Do People have Temporal Parts ? Bibliography Other Internet Resources Related Entries 1. Introduction Y ou're performing an amazing trick right now: you're in two places at once. How do you manage to be down there, near the floor, and yet also be a metre or two up in the air? Well, it's not so very amazing: your feet are down there on the floor, and your head is up in the air. Having spatial parts enables you to  be in several different places, and to have different properties in different places: you're cold down there on the tiled floor, and also warm up there b y the heater, because your feet are cold and your head is warm. Moreover, having parts could let you be in the same place as someone else: if you shared a hand with a conjoined (‘Siamese’) twin, then you cou ld both wear the same glove without jostling for space.  None of this is special to people: inanimate objects also extend through space by having spatial parts. They have different properties in different places, and sometimes they overlap by sharing their parts. These simple facts about spatial parts explain basic features about the way things and people occup y space. Things and people take up time as well as taking up space: you existed yesterday , and, unless reading this article is a real strain, you will exist tomorrow too. Just as you can have different properties at different places (hot up here, cold down there), you can have different properties at different times (yesterday you hadn't heard of temporal parts, by tomorrow you'll know plenty about the m). Some philosophers believe that you take up time by having different temporal parts at different times.

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