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Spectral theory (Mathematics).

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View Resource Pseudospectra Gateway

Visitors to this metasite can find links to software, applications, examples, publications, theories, and histories of pseudospectra in investigation of non-normal matrices and operators. The Introduction page states, "Numerous tools have been suggested to describe non-normality and analyze its effects. These include classical tools of matrix and operator theory, such as the numerical range, the...

http://www.cs.ox.ac.uk/projects/pseudospectra/