Schroedinger operator perturbed by operators related to null sets

We discuss the Schroedinger operator with singular perturbations given by operators which act in the space constructed by a measure supported by a null set. We construct examples when perturbations are given by the one-dimensional Laplacian on a segment. (orig.)Available from FIZ Karlsruhe / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman