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The theory presented in this paper is discussed more fully in my book Counterfactuals (Blackwell and Harvard University Press). My research on counterfactuals was supported by a fellowship from the American Council of Learned Societies.
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Lewis, D. Counterfactuals and comparative possibility. J Philos Logic 2, 418–446 (1973). https://doi.org/10.1007/BF00262950
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DOI: https://doi.org/10.1007/BF00262950