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I am indebted to Robert Kraut for many important insights and to William Lycan, Stephen Boer, George Schumm, Tyler Burge, and Richard Aquila for valuable comments and criticism on earlier versions of this paper.
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Nolt, J.E. Abstraction and modality. Philos Stud 38, 111–127 (1980). https://doi.org/10.1007/BF00374328
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DOI: https://doi.org/10.1007/BF00374328