The problem of computing a principal coefficient function P in the differential equation -▽·(P(x)▽u) = f, x ∈ Ω is contained in R~M, M ≥ 1, on a bounded region Ω from a knowledge of the solution function u and the right-hand side f, where u, f are known only approximately and P may have mild discontinuities, is solved by minimization of an associated functional.
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