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Multiagent Systems

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Prof. Dr. Jürgen Dix · Department of Informatics, TUC <strong>Multiagent</strong> <strong>Systems</strong>, WS 06/07 556/731<br />

8. Action/Time as Modalities 4. BDI<br />

The primitive constructs above allow us to define the<br />

following operators:<br />

Derived Operator Definition Meaning<br />

♦α ∃x(○ x;α?) sometime α<br />

□α ¬♦¬α always α<br />

(Later ϕ) ¬ϕ ∧ ♦ϕ strict sometime<br />

(Before ϕ , ψ) ϕ → □ψ ϕ holds before ψ<br />

Examples:<br />

G citizen □safe a<br />

G police B citizen □safe citizen

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