A Counterexample to Modus Tollens

Journal of Philosophical Logic 41 (6):1001-1024 (2012)
This paper defends a counterexample to Modus Tollens, and uses it to draw some conclusions about the logic and semantics of indicative conditionals and probability operators in natural language. Along the way we investigate some of the interactions of these expressions with 'knows', and we call into question the thesis that all knowledge ascriptions have truth-conditions.
Keywords Conditionals  Probability operators  Epistemic modals  Probability  Dynamic semantics  Context  Common ground  Modus Ponens  Modus Tollens
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DOI 10.1007/s10992-012-9228-4
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References found in this work BETA
Seth Yalcin (2007). Epistemic Modals. Mind 116 (464):983-1026.
Seth Yalcin (2011). Nonfactualism About Epistemic Modality. In Andy Egan & B. Weatherson (eds.), Epistemic Modality. Oxford University Press

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Citations of this work BETA
Nate Charlow (2014). Logic and Semantics for Imperatives. Journal of Philosophical Logic 43 (4):617-664.

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