2 papers
math.NA2026
No Spectral Invisibility for Dissipative Barrier Truncations in Any Dimension
Matthew J. Colbrook, Marco Marletta
The dissipative barrier method suppresses spectral pollution, but whether it can itself conceal genuine spectral points has remained open. Known as the graveyard problem in computa…
math.SP2024
The pseudospectrum of an operator with Bessel-type singularities
Lyonell Boulton, Marco Marletta
In this paper we examine the asymptotic structure of the pseudospectrum of the singular Sturm-Liouville operator subject to periodic boundary…