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19. Language / D. Propositions / 2. Abstract Propositions / b. Propositions as possible worlds

[propositions as sets of possible worlds]

7 ideas
A proposition is a set of possible worlds for which its intension delivers truth [Perry]
A proposition is a set of possible worlds where it is true [Lewis]
A proposition is a set of entire possible worlds which instantiate a particular property [Lewis]
A proposition is the property of being a possible world where it holds true [Lewis]
Propositions can't have syntactic structure if they are just sets of worlds [Lewis]
If propositions are states of affairs or sets of possible worlds, these lack truth values [Heil]
Are there partial propositions, lacking truth value in some possible worlds? [Magidor]