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math.OC2004★ 1 cited
Controllability cost of conservative systems: resolvent condition and transmutation
Luc Miller
This article concerns the exact controllability of unitary groups on Hilbert spaces with unbounded control operator. It provides a necessary and sufficient condition not involving…
math.OC2003★ 1 cited
The control transmutation method and the cost of fast controls
Luc Miller
In this paper, the null controllability in any positive time T of the first-order equation (1) x'(t)=e^{iθ}Ax(t)+Bu(t) (|θ|<π/2 fixed) is deduced from the null controllability in s…