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The Journal of Philosophy

Volume 112, Issue 2, February 2015

Justin Bledin
Pages 57-83
DOI: 10.5840/jphil201511225

Modus Ponens Defended

Is modus ponens valid for the indicative conditional? McGee [1985] famously presents several alleged counterexamples to this inference rule. More recently, Kolodny and MacFarlane [2010] and Willer [2010] argue that modus ponens is unreliable in certain hypothetical contexts. However, none of these attacks undermines an informational conception of logic on which modus ponens is valid.