20 citations · 73 across the 18 of their papers we have counts for
Showing 2021 · math.SPShow all
2 papers · 2 filters
math.SP2021
Spectral enclosures and stability for non-self-adjoint discrete Schroedinger operators on the half-line
David Krejcirik, Ari Laptev, Frantisek Stampach
We make a spectral analysis of discrete Schroedinger operators on the half-line, subject to complex Robin-type boundary couplings and complex-valued potentials. First, optimal spec…
math.SP2021★ 20 cited
A sharp form of the discrete Hardy inequality and the Keller-Pinchover-Pogorzelski inequality
David Krejcirik, Frantisek Stampach
We give a short proof of a recently established Hardy-type inequality due to Keller, Pinchover, and Pogorzelski together with its optimality. Moreover, we identify the remainder te…