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- W2139675971 abstract "Let be a complex infinite-dimensional Hilbert space, let be a bounded linear operator on , and let . The k-numerical range of T, denoted by Wk (T), is defined to be the set of points obtained by letting (e1 ,…,ek ) vary over the set of all orthonormal k-tuples in Let We (T) denote the essential numerical range of T. Let and let {βij} i=1 be a sequence of non-negative scalars such that the series converges. In this paper we show that if, and only if,." @default.
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- W2139675971 date "1994-06-01" @default.
- W2139675971 modified "2023-09-26" @default.
- W2139675971 title "Inclusion relations involving thek-numerical range and the essential numerical range" @default.
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- W2139675971 doi "https://doi.org/10.1080/03081089408818319" @default.
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