Positive and negative results on the internal controllability of parabolic equations coupled by zero and first order terms
arXiv:1701.05318 · doi:10.1007/s00028-017-0415-1
Abstract
This paper is devoted to studying the null and approximate controllability of two linear coupled parabolic equations posed on a smooth domain of R^N (N>1) with coupling terms of zero and first orders and one control localized in some arbitrary nonempty open subset of the domain. We prove the null controllability under a new sufficient condition and we also provide the first example of a not approximately controllable system in the case where the support of one of the nontrivial first order coupling terms intersects the control domain.
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