Tradition states that above the entrance to Plato’s Academy were inscribed the words, “Let no one ignorant of geometry enter here.” A student in the modal logic interim course studies how subjunctives ...

A hypermodality is a connective whose meaning depends on where in the formula it occurs. The paper motivates the notion and shows that hypermodal logics are much more expressive than traditional modal ...

Modal logic, an extension of classical logic, investigates the modes of truth such as necessity and possibility. Its development has been closely intertwined with advances in proof theory, a field ...

Dynamic logic offers a formal framework to reason about actions, transitions and the evolution of systems over time. It extends classical modal logic by incorporating operators that capture state ...

The tetravalent modal logic (TML) is one of the two logics defined by Font and Rius (J Symb Log 65(2):481-518, 2000) (the other is the normal tetravalent modal logic TMLN) in connection with ...