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Prof. Dr. Jürgen Dix · Department of Informatics, TUC <strong>Multiagent</strong> <strong>Systems</strong>, WS 06/07 494/731<br />

7. Modal Logic 3. Axioms for Modal Logics<br />

Exercise: Show that<br />

1 The axiom D follows from KT45.<br />

2 Show that KD45 is not equivalent to K45:<br />

axiom D does not follow from K45.<br />

3 Show that ¬K i ¬ϕ does not follow from<br />

KDT45.<br />

4 Show that K i ϕ → ϕ is not a tautology in K.<br />

5 Show that K i ϕ → K i K i ϕ is not a tautology in<br />

K+K i ϕ → ϕ.

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