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Reachability Games in Dynamic Epistemic Logic

05/29/2019
by   Bastien Maubert, et al.
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We define reachability games based on Dynamic Epistemic Logic (DEL), where the players' actions are finely described as DEL action models. We first consider the setting where an external controller with perfect information interacts with an environment and aims at reaching some epistemic goal state regarding the passive agents of the system. We study the problem of strategy existence for the controller, which generalises the classic epistemic planning problem, and we solve it for several types of actions such as public announcements and public actions. We then consider a yet richer setting where agents themselves are players, whose strategies must be based on their observations. We establish several (un)decidability results for the problem of existence of a distributed strategy, depending on the type of actions the players can use, and relate them to results from the literature on multiplayer games with imperfect information.

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