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PSEUDOSPECTRUM

Pseudospectrum

In mathematics, the pseudospectrum of an operator is a set containing the spectrum of the operator and the numbers that are "almost" eigenvalues. Knowledge

Pseudospectrum

Anders C. Hansen

Norwegian mathematician

Anders (12 July 2010). "On the Solvability Complexity Index, the 𝑛-pseudospectrum and approximations of spectra of operators". Journal of the American

Anders C. Hansen

Anders_C._Hansen

Kreiss matrix theorem

𝒦lhp(A) = 1. 𝒦(A) and 𝒦lhp(A) have alternative definitions through the pseudospectrum Λε(A): K ( A ) = sup ε > 0 ρ ε ( A ) − 1 ε {\displaystyle {\mathcal

Kreiss matrix theorem

Kreiss_matrix_theorem

Albrecht Böttcher

German mathematician (born 1954)

Mathematical Society. doi:10.1090/fim/003. ISBN 978-0-8218-0457-5. Pseudospectrum "International Mathematical Olympiad". imo-official.org. 2011. Archived

Albrecht Böttcher

Albrecht_Böttcher

Spectrum (disambiguation)

Topics referred to by the same term

to operators Spectrum of a graph, studied in spectral graph theory Pseudospectrum Spectrum of a polygon, the set of numbers of possible equidissections

Spectrum (disambiguation)

Spectrum_(disambiguation)

Spectrum (functional analysis)

Set of eigenvalues of a matrix

Essential spectrum Discrete spectrum (mathematics) Self-adjoint operator Pseudospectrum Resolvent set Kreyszig, Erwin. Introductory Functional Analysis with

Spectrum (functional analysis)

Spectrum_(functional_analysis)

Black hole ringdown spectroscopy

Method used to study black holes

"Black-Hole Spectroscopy: Quasinormal Modes, Ringdown Stability and the Pseudospectrum". ui.adsabs.harvard.edu. Retrieved 2026-05-17. Berti, Emanuele; Cardoso

Black hole ringdown spectroscopy