Various qualitative methods for analyzing the discrete spectrum of SchrOdinger operators have been elaborated during the last three decades-for a review see Eef. 1, Section XIII. 3. They are of a great physical interest, especially because they can provide us with an information about -)*the few-body and many-body Hamlltonians, for which the quantitative methods are usually difficult to be applied. lt is not strange, therefore, that new re3ulta of this type continue to appear.
@inproceedings{pavel1984improved,
title={Improved Rosen's conditions on bound states of Schroedinger operators},
author={Pavel Exner},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020135728957414810},
year={1984},
}
Pavel Exner. Improved Rosen's conditions on bound states of Schroedinger operators. 1984. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020135728957414810.