Chapter

Worlds, Books, and Essential Properties

Alvin Plantinga

in The Nature of Necessity

Published in print February 1978 | ISBN: 9780198244141
Published online November 2003 | e-ISBN: 9780191598241 | DOI: http://dx.doi.org/10.1093/0198244142.003.0004

Series: Clarendon Library of Logic and Philosophy

 Worlds, Books, and Essential Properties

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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

Chapter.  9912 words. 

Subjects: Metaphysics

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