Journal
INVERSE PROBLEMS
Volume 17, Issue 5, Pages 1435-1444Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0266-5611/17/5/313
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We consider the problem of the determination of the potential from the Dirichlet to Neumann map of the Schrodinger operator. We show that this problem is severely ill-posed. The results extend to electrical impedance tomography. They show that the logarithmic stability results of Alessandrini are optimal (up to the value of the exponent).
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