Gerschgorin and His Circles (Springer Series in Computational Mathematics) (Hardcover)

"This book is an extremely detailed account of eigenvalue inclusion theorems, starting with the basic GerAgorin disk theorem a ] . One of the most pleasing features of the book is what Varga calls the first recurring theme: every eigenvalue inclusion theorem has a corresponding nonsingularity theorem. a ] contains numerous simple examples and illustrative diagrams, and everything is explained in great detail. a ] For anyone seeking information about eigenvalue inclusion theorems, this book will be a great reference." (David Scott Watkins, Mathematical Reviews, 2005h)

"The monograph presents a survey of results about spectrum localization for matrices, beginning with the first GerAgorina (TM)s eigenvalue inclusion result a ] . This book contains many new and some unpublished results as a survey of many GerAgorin type results in the literature. The presented material is almost entirely self-contained with exercises which are useful both for graduate students in mathematics and physicists, engineers and computer scientists." (Boris V. Loginov, Zentralblatt MATH, 1057: 8, 2005)

"The new book of Varga contains, along with several new results, nearly all that has been discovered about eiegnvalue inclusions since 1931. a ] One of the merits of this book is the information that it provides about SemAn Aronovic Gersgorin a ] . I like this book and recommend reading it." (L. Elsner, American Mathematical Monthly, Vol. 113, April, 2006)

Product Description
This book studies the original results, and their extensions, of the Russian mathematician, S.A. Geršgorin, who wrote a seminal paper in 1931, on how to easily obtain estimates of all n eigenvalues (characteristic values) of any given n-by-n complex matrix. Since the publication of this paper, there has been many newer results spawned by his paper, and this book will be the first which is devoted solely to this resulting area. As such, it will include the latest research results, such as Brauer ovals of Cassini and Brualdi lemniscates, and their comparisons. This book is dedicated to the late Olga Taussky-Todd and her husband, John Todd. It was Olga who brought to light Geršgorin's paper and its significance to the mathematical world. The level of this book requires only a modest background in linear algebra and analysis, and is therefore comprehensible to upper-level and graduate level students in mathematics.

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