It is well-known that many modal logics can be viewed as fragments of $FO^2$, i.e. two-variable first-order logic.

But is there a modal logic that is not a fragment, but is expressively equivalent to $FO^2$?



Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.