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The free boundary determined by the solution to a differential equation. (English) Zbl 0336.35031

MSC:
35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation
35R30 Inverse problems for PDEs
35J67 Boundary values of solutions to elliptic equations and elliptic systems
35B45 A priori estimates in context of PDEs
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