 So far, externalists and internalists agree on one thing: computational states are individuated by cognitive contents. This requirement can be relaxed without abandoning the semantic account of computation. According to Egan (1999), computational vehicles are not individuated by cognitive contents of any kind, whether wide or narrow. Rather, they are individuated by their mathematical contents—that is, mathematical functions and objects ascribed as semantic contents to the computational vehicles by a computational theory of the system. Since mathematical contents are the same across physical duplicates, Egan maintains that her mathematical contents are a kind of narrow content—she is a kind of internalist.