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The Nature of Necessity$
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Alvin Plantinga

Print publication date: 1978

Print ISBN-13: 9780198244141

Published to Oxford Scholarship Online: November 2003

DOI: 10.1093/0198244142.001.0001

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Worlds, Books, and Essential Properties

Worlds, Books, and Essential Properties

Chapter:
(p.44) IV Worlds, Books, and Essential Properties
Source:
The Nature of Necessity
Author(s):

Alvin Plantinga (Contributor Webpage)

Publisher:
Oxford University Press
DOI:10.1093/0198244142.003.0004

I begin by introducing the ideas of possible worlds, books on worlds, and essential properties. A possible world is a broadly logically possible state of affairs that is maximal. Furthermore, for any possible world W and proposition p, let the book on W be the set S of propositions such that p is a member of S if W entails p. Finally, an object x has property P essentially if and only if x has P and has it in every world in which x exists. I use the above three concepts to give a sound argument for the conclusion that human persons are essentially immaterial.

Keywords:   essential, immaterial, possible worlds, property, proposition, state of affairs

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