Modal realism is the view, notably propounded by David Lewis, that possible worlds are as real as the actual world. It is based on the following notions: that possible worlds exist; possible worlds are not different in kind to the actual world; possible worlds are irreducible entities; the term 'actual' in 'actual world' is indexical. David K. Lewis David Kellogg Lewis (September 28, 1941 - October 14, 2001) is considered by many to have been the leading Analytic philosopher of the latter half of the 20th century. ... In philosophy and logic, the concept of possible worlds is used to express modal claims, claims that involve notions of possibility or necessity. ...
Intense debate has also emerged over the ontological status of possible worlds, provoked especially by David Lewis's defense of modalrealism, the doctrine that talk about "possible worlds" is best explained in terms of innumerable, really existing worlds beyond the one we live in.
In the many-worlds interpretation of quantum mechanics, the collapse of the wavefunction is interpreted by introducing a quantum superposition of states of a possibly infinite number of identical "parallel universes", all of which exist "actually", according to some proponents.
In this approach, the modal structure of the fictional text is analysed in relation to its narrative and thematic concerns.
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