Numerical linear algebra | Spectral theory

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 of the pseudospectrum can be particularly useful for understanding non-normal operators and their eigenfunctions. The ε-pseudospectrum of a matrix A consists of all eigenvalues of matrices which are ε-close to A: Numerical algorithms which calculate the eigenvalues of a matrix give only approximate results due to rounding and other errors. These errors can be described with the matrix E. More generally, for Banach spaces and operators , one can define the -pseudospectrum of (typically denoted by ) in the following way where we use the convention that if is not invertible. (Wikipedia).

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Banach space | Operator (mathematics) | Normal operator | Mathematics | Set (mathematics) | Eigenvalue algorithm