Block Numerical Range and Estimable Decomposition of Some Hyponormal Operators
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DOI: 10.1007/s11785-019-00967-2
Abstract: In this paper we investigate the block numerical range and the existences of estimable decompositions of bounded linear operators on a separable Hilbert space. By using spectral measure, we show that there exists an estimable… read more here.
Keywords: block numerical; estimable decomposition; hyponormal operators; numerical range ... See more keywords
Approximation of the block numerical range of block operator matrices
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DOI: 10.2298/fil1912877y
Abstract: In this paper we obtain an approximation of the block numerical range of bounded and unbounded block operator matrices by projection methods. read more here.
Keywords: block numerical; block; operator matrices; block operator ... See more keywords