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Prof. Dr. Jürgen Dix · Department of Informatics, TUC <strong>Multiagent</strong> <strong>Systems</strong>, WS 06/07 479/731<br />

7. Modal Logic 1. Reasoning about Knowledge<br />

Definition 7.3 (Semantics for partition models)<br />

Let an n-agent partition model<br />

A = (W, I 1 , . . . , I n ) over a language L be given.<br />

Then we define the relation |= for L(K 1 , . . . , K n )<br />

formulae as follows:<br />

for φ ∈ L: A, w |= φ if and only if w |= φ,<br />

A, w |= K i φ if and only if for all worlds w ′ , if<br />

w ′ ∈ I i (w) then A, w ′ |= φ.

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