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Inverse problem determines Signorini obstacle using boundary measurements in elasticity systems, indicating unique solutions.
We study the inverse problem of determining a Signorini obstacle from boundary measurements for the isotropic elasticity system. We prove that the obstacle can be uniquely determined by a single measurement of displacement and normal stress for the Signorini problem on an open subset of the boundary up to a natural obstruction. In addition to considering the Signorini problem, we develop techniques that can be used to study inverse problems for general differential inequalities.
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Hoop et al. (2026) studied this question.
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