Intertranslatability, Theoretical Equivalence, and Perversion

I investigate syntactic notions of theoretical equivalence between logical theories and an recent objection thereto. I show that this recent criticism of syntactic accounts as extensionally inadequate is unwarranted by developing an account which is plausibly extensionally adequate and more philosophically motivated. This is important for recent anti-exceptionalist treatments of logic since syntactic accounts require less theoretical baggage than semantic accounts.