Inverse spectral analysis with partial information on the potential, II. The case of discrete spectrum

We discuss results where the discrete spectrum (or partial information on the discrete spectrum) and partial information on the potential of a one-dimensional Schrödinger operator determine the potential completely. Included are theorems for finite intervals and for the whole line. In particular, we pose and solve a new type of inverse spectral problem involving fractions of the eigenvalues of on a finite interval and knowledge of over a corresponding fraction of the interval. The methods employed rest on Weyl -function techniques and densities of zeros of a class of entire functions.