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Etlin, David (2009): The Problem of Noncounterfactual Conditionals. In: Philosophy of Science, Vol. 76, No. 5: pp. 676-688
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I defend a formulation of the Ramsey Test with a condition for accepting negations of conditionals. It is implicit in the assumptions of the triviality theorems of Gärdenfors, Harper, and Lewis; and it allows for a unified proof of those theorems, from weaker assumptions about belief revision. This leads to a proof of McGee’s thesis that iterated conditionals do not obey modus ponens.