Spatial numerical range of an operator
1974 ◽
Vol 76
(3)
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pp. 515-520
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0. Introduction. Let X be a normed space and let T be an operator on X. Let S(X) denote its unit sphere, {x ∈ X: ∥x∥ = 1}, B(X) = {x ∈ X: ∥x∥ ≤ 1} its unit ball, X′ its dual and ℬ(X) the normed algebra of bounded linear operators on X. Let II be the subset of the Cartesian product X × X′ defined by
1984 ◽
Vol 96
(3)
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pp. 483-493
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1977 ◽
Vol 29
(5)
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pp. 1010-1030
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1969 ◽
Vol 10
(1)
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pp. 68-72
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1969 ◽
Vol 16
(3)
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pp. 227-232
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1988 ◽
Vol 31
(1)
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pp. 127-144
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1986 ◽
Vol 29
(1)
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pp. 15-21
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Keyword(s):
2014 ◽
Vol 57
(3)
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pp. 709-718
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