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Decentralized stochastic control

Decentralized stochastic control refers to the multi-stage optimization of a dynamical system by multiple controllers that have access to different information. Decentralization of information gives rise to new conceptual challenges that require new solution approaches. In this expository paper, we use the notion of an \emph{information-state} to explain the two commonly used solution approaches to decentralized control: the person-by-person approach and the common-information approach.