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One new strategy for a priori choice of regularizing parameters in Tikhonov’s regularization. (English) Zbl 0957.65052
Ill-posed inverse problems in Banach spaces of the type $$K(f)= 0$$ for given $$g$$ and a possibly nonlinear, densely defined operator $$K$$ are considered. The inverse $$K^{-1}$$ is assumed to be not continuous or the range of $$K$$ is not closed. The authors provide a strategy for choosing a priori the parameter in Tikhonov’s regularization method for solving the problem approximately. The resulting convergence is analyzed under the assumption and conditional stability.
The new strategy is demonstrated for some examples (determination of coefficients or sources in a wave equation, determination of the shape of a boundary, and an integral equation with analytic kernel of the first kind).

##### MSC:
 65J15 Numerical solutions to equations with nonlinear operators (do not use 65Hxx) 65J20 Numerical solutions of ill-posed problems in abstract spaces; regularization 65R32 Numerical methods for inverse problems for integral equations 45B05 Fredholm integral equations 35L05 Wave equation 47J25 Iterative procedures involving nonlinear operators 47J06 Nonlinear ill-posed problems 65M32 Numerical methods for inverse problems for initial value and initial-boundary value problems involving PDEs 35R30 Inverse problems for PDEs 65J22 Numerical solution to inverse problems in abstract spaces
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