In philosophy, specifically in the area of modal metaphysics, counterpart theory is an alternative to standard (Kripkean) possible-worlds semantics for interpreting quantified modal logic. Counterpart theory still presupposes possible worlds, but differs in certain important respects from the Kripkean view. The form of the theory most commonly cited was developed by David Lewis, first in a paper and later in his book On The Plurality of Worlds.
Read more about Counterpart Theory: Differences From The Kripkean View, The Counterpart Relation, The Formal Theory, Motivations For Counterpart Theory, Counterpart Theory and The Necessity of Identity, Counterpart Theory and Rigid Designators, Arguments Against Counterpart Theory
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