This is a preview. Log in through your library . Abstract Jaśkowski's discussive logic D₂ was formulated with the help of the modal logic S5 as follows (see [7, 8]): A ∊ D₂ iff ┌ A ┐ ∊ S5, where (-) ...
We outline the rather complicated history of attempts at axiomatizing Jaśkowski's discussive logic D₂ and show that some clarity can be had by paying close attention to the language we work with. We ...