Consequences of Conditional Excluded Middle

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Conditional excluded middle (CEM) is the following principe of counterfactual logic: either, if it were the case that φ, it would be the case that ψ, or, if it were the case that φ, it would be the case that not-ψ. I will first show that CEM entails the identity of indiscernibles, the falsity of physicalism, and the failure of the modal to supervene on the categorical and of the vague to supervene on the precise. I will then argue that we should accept these startling conclusions, since CEM is valid.
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.Williamson, Timothy

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Conditional Heresies.Cariani, Fabrizio & Goldstein, Simon
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