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Prof. Dr. Jürgen Dix · Department of Informatics, TUC <strong>Multiagent</strong> <strong>Systems</strong>, WS 06/07 501/731<br />

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

Axiom (KD1) is the so called K-axiom; (KD2) is<br />

the D-axiom, stating that obligatory implies<br />

permitted; (KD3) states that permission is the<br />

dual of obligation and (KD4) says that forbidden<br />

is not permitted. (KD1) holds for any modal<br />

necessity operator.<br />

O is the basic operator (all others are definable<br />

with it). The axioms reflect the idea that<br />

something is obligated if it holds in all perfect<br />

(ideal) worlds (relative to the world where one<br />

is).

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