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My thanks go to David Lewis, Carolyn McMullen, Thomas Nagel, and Derek Parfit for their help.
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Maddy, P. Is the importance of identity derivative?. Philos Stud 35, 151–170 (1979). https://doi.org/10.1007/BF00377746
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DOI: https://doi.org/10.1007/BF00377746