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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 06/07 518/731<br />

8. Action/Time as Modalities 1. Time: LTL, CTL<br />

Typical temporal operators<br />

○ϕ<br />

□ϕ<br />

♦ϕ<br />

ϕ U ψ<br />

ϕ is true in the next moment in time<br />

ϕ is true in all future moments<br />

ϕ is true in some future moment<br />

ϕ is true until the moment when ψ<br />

becomes true<br />

□((¬passport ∨ ¬ticket) → ○¬board_flight)<br />

send(msg, rcvr) → ♦receive(msg, rcvr)

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