In this note, we prove the exact controllability for the semilinear wave equations in any space dimensions under the condition that the nonlinearity behaves like Ž< < < < . ' o s ln s as s ª ϱ.
Exact controllability for the magnetohydrodynamic equations
✍ Scribed by Viorel Barbu; Teodor Havârneanu; Cătălin Popa; S. S. Sritharan
- Publisher
- John Wiley and Sons
- Year
- 2003
- Tongue
- English
- Weight
- 390 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0010-3640
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✦ Synopsis
Abstract
We study the local exact controllability of the steady state solutions of the magnetohydrodynamic equations. The main result of the paper asserts that the steady state solutions of these equations are locally controllable if they are smooth enough. We reduce the local exact controllability of the steady state solutions of the magnetohydrodynamic equations to the global exact controllability of the null solution of the linearized magnetohydrodynamic system via a fixed‐point argument. The treatment of the reduced problem relies on two Carleman‐type inequalities for the backward adjoint system. © 2003 Wiley Periodicals, Inc.
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