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tain individuals of the reference world as characterized by unheard-of properties.
It is useful to use the notion of possible world when one refers to a state of affairs, but only if one needs to compare at least two alternative states of affairs. If one says that Donald Duck is an invention by Disney and that we have few chances to meet him on Sunset Boulevard, one certainly says that Donald Duck belongs to a world of fantasy, but no specific Possible Worlds Theory is requested in order to discover or to prove such a triviality. If, on the contrary, one analyzes a very peculiar movie as Who Framed Roger Rabbit? in which cartoons interact with allegedly "real" characters, then problems of mutual accessibility between different worlds can be legitimately debated.
If Tom says that he hopes to buy a big boat, his sentence expresses a propositional attitude that, as such, outlines the possible world of
23167-0069a.GIF
Figure 4.1

 
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