3 papers
math.NA2025
Blocking structures, approximation, and preconditioning
Nikos Barakitis, Marco Donatelli, Samuele Ferri +3
We consider block-structured matrices , where the blocks are of (block) unilevel Toeplitz type with matrix-valued generating functions. Under mild assumptions on t…
math.NA2022
Spectral Analysis and Preconditioned Iterative Solvers for Large Structured Linear Systems
Nikos Barakitis
In this thesis, the numerical solution of three different classes of problems have been studied. Specifically, new techniques have been proposed and their theoretical analysis has…
math.NA2022
On a Boundary Updating Method for the Scalar Stefan Problem
Evangelos F. Magirou, Paraskevas Vassalos, Nikolaos Barakitis
We report on a general purpose method for the scalar Stefan problem inspired by the standard boundary updating method used in several existence proofs. By suitably modifying it we…