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The research for this paper was supported by a Senior Fellowship awarded to the author by the National Endowment for the Humanities in 1973. Also I am indebted to T. Parsons for suggestions and improvements.
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Lambert, K. Predication and extensionality. J Philos Logic 3, 255–264 (1974). https://doi.org/10.1007/BF00247226
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DOI: https://doi.org/10.1007/BF00247226