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9. Agents based on FOL 1. First Order Logic (FOL)<br />

Definition 9.6 (Tautology)<br />

1 A theory is a set of formulae without free<br />

variables: T ⊆ F ml L . A satisfies T if A |= ϕ<br />

holds for all ϕ ∈ T . We write A |= T .<br />

2 A L-formula ϕ is called L-tautology, if for all<br />

matching L-structures A the following holds:<br />

A |= ϕ.<br />

From now on we mostly suppress the language<br />

L, because it is clearly obvious from the context.<br />

Nevertheless it has to be defined always.<br />

rof. Dr. Jürgen Dix · Department of Informatics, TUC <strong>Multiagent</strong> <strong>Systems</strong>, WS 06/07 609/731

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