Regularization of the metric generalized inverse in Banach spaces and the dichotomy phenomenon

For a bounded linear operator acting between Banach spaces, its metric generalized inverse is the analog to the prominent Moore-Penrose inverse for operators acting between Hilbert spaces.

This generalized inverse is well-defined for Banach spaces that are strictly convex and reflexive.

Previous studies had been restricted to closed range situations, where the metric generalized inverse constitutes a continuous homogeneous mapping.

The focus of the present study is on the ill-posed situation in the sense of Nashed, when the governing operator has a non-closed range.

We define and analyze iterative schemes as the Landweber and the Schulz-Newton method, as well as parametric schemes with focus on a specific Tikhonov method.

Both types are called regularizations aimed at approximating the metric generalized inverse.

As a fundamental feature of such schemes we observe a dichotomy.

This emphasizes that these schemes, when applied to elements of the domain of the metric generalized inverse, approximate the corresponding best approximate solutions well, whereas the resulting approximations will be asymptotically unbounded if they are applied to elements that do not belong to the domain of the metric generalized inverse.