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# Operator Algebras Seminar

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Fri., Oct. 9, 2015 11:00 a.m.
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Location: CK 185
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**Speaker:**Samir RaouafiPseudospectra and Kreiss Matrix Theorem**Title:**The theory of pseudospectra is a new tool for studying matrices and linear operators. The traditional tool is the spectrum. It reveals information on the behavior of normal matrices or operators. However, it is less informative as the matrix or the operator is non-normal. Pseudospectra have nevertheless proved to be a powerful tool to study them. In this first lecture, we present some properties of the pseudospectra. We will discuss also the Kreiss Matrix Theorem and interesting examples.**Abstract:**