Existence and Knowledge

Existence and Knowledge

Actualism and the Approach of Alvin Plantinga to It

Document Type : Research Article

Authors
Mojtaba Amir Khanlo 1
Lotfollah Nabavi 2
1 PhD student in Philosophy - Logic, Tarbiat Modares University
2 Associate Professor of Philosophy, Tarbiat Modares University
Abstract
Actualism is an ontological thesis that according to which the domain of actual objects is same as the domain of existent objects. There are different versions of Actualism and the one known as the Classical Actualism is adopted by Plantinga, Fine, Salmon, Deutsch and Menzel. The model of the Classical Actualism has a variable domain and its quantifiers are world­–­restricted. Plantinga, in his account, adds the essences, as actual existing objects, to the domain of possible objects and tries to impart the role of possible objects to the actual ones. This approach has two main problems: first, the essences are not the purely qualitative properties and second, it fails to justify the "Barcan Formula" and Necessary Existence.
Keywords
Actualism
SQML
Plantinga
Barcan Formula
Conversion of Barcan Formula
Necessary Existence
Iterated Modality
Possibility of Aliens

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