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Subsets characterizing the closure of the numerical range
Published online by Cambridge University Press: 09 April 2009
Abstract
For an operator on a Hilbert space, points in the closure of its numerical range are characterized as either extreme, non-extreme boundary, or interior in terms of various associated sets of bounded sequences of vectors. These generalize similar results due to Embry, for points in the numerical range.
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- Copyright © Australian Mathematical Society 1986