New perturbation results on pseudo-inverses of linear operators in Banach spaces
Let \(X\) and \(Y\) be Banach spaces. Let \(T\) and \(S\) be bounded linear operators from \(X\) into \(Y\). Assume that \(T\) has closed range. There are given conditions for \(S-T\) to have closed range and new estimations for pseudo-inverses of \(S\).
scientific article; zbMATH DE number 1880077