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Prof. Dr. Jürgen Dix · Department of Informatics, TUC <strong>Multiagent</strong> <strong>Systems</strong>, WS 06/07 423/731<br />

6. Propositional Logic 2. Sentential Logic<br />

Definition 6.9 (Consistency of a Theory)<br />

T is called consistent if there is a valuation (model) v with<br />

¯v(ϕ) = true for all ϕ ∈ T .<br />

Lemma 6.10 (Ex Falso Quodlibet)<br />

T is consistent if and only if Cn(T ) ≠ F ml L .

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