2003 Volume 39 Issue 2 Pages 227-274
We prove Carleman inequalities for a second order parabolic equation when the coefficients are not bounded and norms of right hand sides are taken in the Sobolev space L2(0, T;W2−{l}(Ω)), {l}∈[0, 1]. Our Carleman inequality yields the unique continuation for L2-solutions. We further apply these inequalities to the global exact zero controllability of a semilinear parabolic equation whose semilinear term also contains derivatives of first order of solutions and is of sub-linear growth at the infinity.
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