This is a preview. Log in through your library . Abstract We construct an extension $\scr{L}^{P}$ of the standard language $\scr{L}$ of classical propositional logic by adjoining to the alphabet of ...

This is a preview. Log in through your library . Abstract A propositional system of modal logic is second-order if it contains quantifiers ∀p and ∃p, which, in the standard interpretation, are ...