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Exact controllability to the trajectories of the heat equation with Fourier boundary conditions: the semilinear case

Enrique Fernández-CaraManuel González-BurgosSergio GuerreroJean-Pierre Puel — 2006

ESAIM: Control, Optimisation and Calculus of Variations

This paper is concerned with the global exact controllability of the semilinear heat equation (with nonlinear terms involving the state and the gradient) completed with boundary conditions of the form y n + f ( y ) = 0 . We consider distributed controls, with support in a small set. The null controllability of similar linear systems has been analyzed in a previous first part of this work. In this second part we show that, when the nonlinear terms are locally Lipschitz-continuous and slightly superlinear, one...

Null controllability of the heat equation with boundary Fourier conditions: the linear case

Enrique Fernández-CaraManuel González-BurgosSergio GuerreroJean-Pierre Puel — 2006

ESAIM: Control, Optimisation and Calculus of Variations

In this paper, we prove the global null controllability of the linear heat equation completed with linear Fourier boundary conditions of the form y n + β y = 0 . We consider distributed controls with support in a small set and nonregular coefficients β = β ( x , t ) . For the proof of null controllability, a crucial tool will be a new Carleman estimate for the weak solutions of the classical heat equation with nonhomogeneous Neumann boundary conditions.

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