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Exact controllability and stabilizability of the Korteweg-de Vries equation. (English) Zbl 0862.93035
The paper studies the exact controllability and stabilizability problem of the KdV equation: $\partial_tu+u \partial_xu+\partial^3_xu=f,\quad 0\leq x\leq 2\pi,\quad t\geq 0$ with periodic boundary conditions: $$\partial^k_xu(0,t)= \partial^k_xu(2\pi,t)$$, $$k=0,1,2$$, where $$f$$ denotes a distributed control input such that $$\int^{2\pi}_0 f dx=0$$. The exact controllability problem with finite time $$T$$ is sought first for the linear equation: $$\partial_tu+\partial^3_xu=f$$ within the framework of the moment problem: It is solved by introducing an associated Riesz basis (eigenfunctions) and the dual Riesz basis. Then the problem for the original KdV equation is solved by interpreting the term $$u\partial_xu$$ as a control via a Fredholm operator. As to the stabilizability problem, the control $$f$$ is chosen as a feedback of the state $$u$$ which reduces $$\int^{2\pi}_0 u^2dx$$ monotonically. By establishing a discrete decay inequality first, an exponential decay estimate is finally obtained.
Reviewer: T.Nambu (Kobe)

##### MSC:
 93C20 Control/observation systems governed by partial differential equations 35K60 Nonlinear initial, boundary and initial-boundary value problems for linear parabolic equations 93D15 Stabilization of systems by feedback 35Q53 KdV equations (Korteweg-de Vries equations)
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