Hankel and Toeplitz operators of finite rank and Prony's problem in several variables

Abstract

Prony's problem in several variables has attracted some attention recently and provides an interesting combination of polynomial ideal theory with analytic and numeric computations. This note points out further connections to Hankel operators of finite rank as they appear in multidimensional moment problems, shift invariance signal spaces, annihilating ideals of filters and factorization of the Hankel matrices and operators by means of Vandermonde matrices. In fact, it turns out that these concepts are essentially equivalent.