Maximum Principle and Bang-Bang Property of Time Optimal Controls for Schrödinger-Type Systems

We consider the time optimal control problem, with a point target, for a class of infinite dimensional systems with a dynamics governed by an abstract Schrodinger type equation. The main results establish a Pontryagyn type maximum principle and give sufficient conditions for the bang-bang property of optimal controls. The results are then applied to some systems governed by partial differential equations. The paper ends by a discussion of possible extensions and by stating some open problems.

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