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Reconstructions from boundary measurements. (English) Zbl 0675.35084
The following problem is considered: Let \(\Omega\) be a bounded domain in \({\mathbb{R}}^ n\), \(n\geq 3\), with a \(C^{1,1}\) boundary and let \(\gamma\) (x) be a real-valued function in \(C^{1,1}({\bar \Omega})\) with a positive lower bound. Moreover, let \(u\in H^ 1(\Omega)\) be the unique solution of \[ \nabla \cdot (\gamma \nabla u)=0\quad in\quad \Omega,\quad u|_{\partial \Omega}=f, \] where \(f\in H^{1/2}(\partial \Omega)\) and let \(Q_{\gamma}(f)=\int_{\Omega}\gamma (x)| \nabla u(x)|^ 2 dx.\)
If \(\Omega\) represents an inhomogeneous, isotropic body with conductivity \(\gamma\), then \(Q_{\gamma}(f)\) is the power necessary to maintain a voltage potential f on the boundary \(\partial \Omega.\)
The author proofs that \(\gamma\) is uniquely determined by \(Q_{\gamma}\) and gives a solution to the reconstruction problem.
Reviewer: A.Neubauer

35R30 Inverse problems for PDEs
35J25 Boundary value problems for second-order elliptic equations
35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation
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