Uniqueness for an Elliptic Inverse Problem

For the elliptic equation $-\nabla\cdot(p(x)\nabla v)+\lambda q(x)v=f,\ x\in\Omega\subset\bbR^n,$ the problem of determining when one or more of the coefficient functions p, q, and f are defined uniquely by a knowledge of one or more of the solution functions $v=v_{p,q,f,\lambda}$ is considered.

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