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Types, Tableaus, and Gödel's God

Types, Tableaus, and Gödel's God

Paperback

Series: Trends in Logic, Book 12

PhilosophyLogic

ISBN10: 9401039127
ISBN13: 9789401039123
Publisher: Springer Nature
Published: Oct 11 2012
Pages: 181
Weight: 0.63
Height: 0.42 Width: 6.14 Depth: 9.21
Language: English
Gödel's modal ontological argument is the centrepiece of an extensive examination of intensional logic. First, classical type theory is presented semantically, tableau rules for it are introduced, and the Prawitz/Takahashi completeness proof is given. Then modal machinery is added, semantically and through tableau rules, to produce a modified version of Montague/Gallin intensional logic. Extensionality, rigidity, equality, identity, and definite descriptions are investigated. Finally, various ontological proofs for the existence of God are discussed informally, and the Gödel argument is fully formalized. Objections to the Gödel argument are examined, including one due to Howard Sobel showing Gödel's assumptions are so strong that the modal logic collapses. It is shown that this argument depends critically on whether properties are understood intensionally or extensionally.

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