logic syntax propositional calculus mally done instead influenced alethic modal logics mally benefited von wright published ''a new system deontic logic'' return syntax propositional calculus thus significant return mally 's system von wright 's departure return syntax propositional calculus see ''deontic logic personal view'' ''a new system deontic logic'' georg henrik von wright g h von wright 's adoption modal logic
Humanities Philosophy Logic Deontic Logic