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

Lemma 6.5 (Properties of Cn(T ))<br />

The semantic consequence operator has the following<br />

properties:<br />

1 T -expansion: T ⊆ Cn(T ),<br />

2 Monotony: T ⊆ T ′ ⇒ Cn(T ) ⊆ Cn(T ′ ),<br />

3 Closure: Cn(Cn(T )) = Cn(T ).<br />

Lemma 6.6 (ϕ ∉ Cn(T))<br />

ϕ ∉ Cn(T ) if and only if there is a model v with v |=<br />

T and ¯v(ϕ) = false.<br />

rof. Dr. Jürgen Dix · Department of Informatics, TUC <strong>Multiagent</strong> <strong>Systems</strong>, WS 06/07 420/731

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