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Prof. Dr. Jürgen Dix · Department of Informatics, TUC <strong>Multiagent</strong> <strong>Systems</strong>, WS 06/07 498/731<br />

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

Definition 7.12 (System OS)<br />

The system OS is based on two modalities<br />

(deontic operators): O, meaning obligation,<br />

and P meaning permission. It is an extension of<br />

the propositional calculus by the axioms<br />

OS1 Op ↔ ¬P¬p<br />

OS2 Pp ∨ P¬p<br />

OS3 P(p ∨ q) ↔ Pp ∨ Pq<br />

and the inference rule<br />

ϕ ↔ ψ<br />

(OS4)<br />

Pϕ ↔ Pψ .

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