Geodesic
On controllability problems for the wave equation on a half-plane
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 1 (2005) no. 1, pp. 93-115 Cet article a éte moissonné depuis la source Math-Net.Ru

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Necessary and sufficient conditions for null-controllability and approximate null-controllability are obtained for the wave equation on a half-plane. Controls solving these problems are found explicitly. Moreover bang-bang controls solving the approximate null-controllability problem are constructed with the aid of the Markov power moment problem. 
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L. V. Fardigola. On controllability problems for the wave equation on a half-plane. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 1 (2005) no. 1, pp. 93-115. http://geodesic.mathdoc.fr/item/JMAG_2005_1_1_a5/

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