2 papers
math.NA2025
Matrix best approximation in the spectral norm
Vance Faber, Jörg Liesen, Petr Tichý
We derive, similar to Lau and Riha, a matrix formulation of a general best approximation theorem of Singer for the special case of spectral approximations of a given matrix from a…
math.NA2014
Pták's nondiscrete induction and its application to matrix iterations
Jörg Liesen
Vlastimil Pták's method of nondiscrete induction is based on the idea that in the analysis of iterative processes one should aim at rates of convergence as functions rather than ju…