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| In this talk, based on joint work with P. Cannarsa and A.Y. Khapalov, we study the global approximate controllability properties of a one dimensional semilinear reaction-diffusion equation governed via the coefficient of the reaction term. It is assumed that both the initial and target states admit no more than finitely many changes of sign. We also extend our 1-D results to higher dimensional reaction-diffusion equations on a disc, provided that all involved parameters have radial symmetry. |
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