Volume 112, Issue 2, February 2015
Modus Ponens Defended
Is modus ponens valid for the indicative conditional? McGee  famously presents several alleged counterexamples to this inference rule. More recently, Kolodny and MacFarlane  and Willer  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.