A Counterexample to Modus Tollens
Journal of Philosophical Logic 41 (6):1001-1024 (2012)
| Abstract | 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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