00429nam a22001457a 450000500170000002000180001710000230003524500810005826000490013930000130018865000160020165000220021765000270023970000170026620260109160350.0  a9780691119465  aTrefethen, Llyod N  aSpectra and pseudospectra: the behaviour of nonnormal matrices and operators  aNew JerseybPrinceton university pressc2005  axvii+606  aEigenvalues  aSpectrum analysis  aDifferential operators  aEmbree, Mark