R. Szwarc

collaborators

2 papers

math.FA2026

Special N-extremal solutions to indeterminate moment problems

Christian Berg, Ryszard Szwarc

For an N-extremal solution $I^¼$ to an indeterminate moment problem it is known by a theorem of M. Riesz that the measure $(1 + x^{2})^{- 1} d I^¼ (x)$ is determinate. For $0 < I^\pm < 1$ we show b…

math.FA2025

Indeterminate Jacobi operators II

Christian Berg, Ryszard Szwarc

We consider the Jacobi operator (T,D(T)) associated with an indeterminate Hamburger moment problem, and present countable subsets S of the domain D(T) such that span(S) is dense in…