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Prof. Dr. Jürgen Dix · Department of Informatics, TUC <strong>Multiagent</strong> <strong>Systems</strong>, WS 06/07 500/731<br />

7. Modal Logic 4. Normative Reasoning<br />

The KD System<br />

The KD System is a von Wright-type system<br />

including the F (forbidden) operator and<br />

consisting of the following additional axioms<br />

and rules (again the classical axioms and modus<br />

ponens are included).<br />

(KD1) O(p → q) → (Op → Oq)<br />

(KD2) Op → Pp<br />

(KD3) Pp ≡ ¬O¬p<br />

(KD4) Fp ≡ ¬Pp<br />

(KD5) O-necessitation:<br />

p<br />

Op

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