# American Institute of Mathematical Sciences

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February  2009, 23(1&2): 571-604. doi: 10.3934/dcds.2009.23.571

## Time discrete wave equations: Boundary observability and control

 1 Academy of Mathematics and Systems Sciences, Chinese Academy of Sciences, Beijing 100190 2 School of Mathematical Sciences, Beijing Normal University, Beijing 100875, China 3 Basque Center for Applied Mathematics (BCAM), Gran Via 35, 48009 Bilbao, Spain

Received  September 2007 Revised  February 2008 Published  September 2008

In this paper we study the exact boundary controllability of atrapezoidal time discrete wave equation in a bounded domain. Weprove that the projection of the solution in an appropriate filteredspace is exactly controllable with uniformly bounded cost withrespect to the time-step. In this way, the well-knownexact-controllability property of the wave equation can bereproduced as the limit, as the time step $h\rightarrow 0$, of thecontrollability of projections of the time-discrete one. By dualitythese results are equivalent to deriving uniform observabilityestimates (with respect to $h\rightarrow 0$) within a class ofsolutions of the time-discrete problem in which the high frequencycomponents have been filtered. The later is established by means ofa time-discrete version of the classical multiplier technique. Theoptimality of the order of the filtering parameter is alsoestablished, although a careful analysis of the expected velocity ofpropagation of time-discrete waves indicates that its actual valuecould be improved.
Citation: Xu Zhang, Chuang Zheng, Enrique Zuazua. Time discrete wave equations: Boundary observability and control. Discrete and Continuous Dynamical Systems, 2009, 23 (1&2) : 571-604. doi: 10.3934/dcds.2009.23.571
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