FUNDAMENTALNAYA
I PRIKLADNAYA MATEMATIKA
(FUNDAMENTAL AND APPLIED MATHEMATICS)
1999, VOLUME 5, NUMBER 2, PAGES 411-416
V. V. Dubrovsky
L. V. Smirnova
Abstract
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The inverse problem for the Laplacian under the Robin's boundary
conditions is considered. We prove the following
{\bfseries Theorem.} If $q_p$ , $p=1,2$ , are real twice continuously
differentiable functions on $\bar{\Omega}$ and there exists
a subsequence $i_k$ of positive integers such that
$\|v_{i_k}(q_p)\|_{L_2(S)}\leq \mathrm{const}
|\lambda_{i_k}|^{\beta}$ ,
where $v_i(q_p)$ are orthonormal eigenfunctions of the operator
$-\Delta+q$ in the case of Robin's boundary conditions with
the eigenvalues $\lambda_i$ , $i\in\mathbb N$ , and
$0\leq\beta<4^{-1}$ then there exists an infinite subsequence
$i_{k_{l_m}}$ of positive integers such that the conditions
$$
\lambda_i(q_1)=\lambda_i(q_2),\ \ i\neq i_{k_{l_m}},\quad
v_i(q_1)|_S=v_i(q_2)|_S,\ \ i\neq i_{k_{l_m}},
$$
imply $q_1=q_2$ .
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Last modified: July 6, 1999