The spectrum of a matrix or operator is an essential tool for analysing the behaviour of physical systems, which can occasionally be misleading. The authors introduce the theory of pseudospectra, an alternative to the spectrum and illustrate applications of the theory in science and mathematics.Trefethen, Lloyd N. is the author of 'Spectra And Pseudospectra The Behavior of Nonnormal Matrices And Operators', published 2005 under ISBN 9780691119465 and ISBN 0691119465.
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