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'Letter to G.H. Schaller', 'First-order Logic, 2nd-order, Completeness' and 'A Defense of Presentism'
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10. Modality / E. Possible worlds / 2. Nature of Possible Worlds / a. Nature of possible worlds
14002
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Possible worlds must be abstract, because two qualitatively identical worlds are just one world [Markosian]
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