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math.NA2025
Multicentric representation of piecewise constant holomorphic functions and Hermite interpolation
Olavi Nevanlinna, Tiina Vesanen
In multicentric representation of piecewise holomorphic functions one combines Lagrange interpolation at roots of a polynomial with convergent power series of as the "coeff…
math.NA2016
Complexity Issues in Computing Spectra, Pseudospectra and Resolvents
Anders C. Hansen, Olavi Nevanlinna
We display methods that allow for computations of spectra, pseudospectra and resolvents of linear operators on Hilbert spaces and also elements in unital Banach algebras. The paper…