منابع مشابه
1-hyperreflexivity and Complete Hyperreflexivity
The subspaces and subalgebras of B(H) which are hyperreflexive with constant 1 are completely classified. It is shown that there are 1-hyperreflexive subspaces for which the complete hyperreflexivity constant is strictly greater than 1. The constants for CT ⊗ B(H) are analyzed in detail.
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Working over C and formalizing and sharpening approaches introduced in [X3], [S] and [R1], we give a method for verifying when a divisor on a blow up of P at general points is nef. The method is useful both theoretically and when doing computer computations. The main application is to obtaining lower bounds on multipoint Seshadri constants on P. In combination with methods developed in [HR], si...
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We show that each reflexive finite-dimensional subspace of operators is hyperreflexive. This gives a positive answer to a problem of Kraus and Larson. We also show that each n– dimensional subspace of Hilbert space operators is [ √ 2n]–hyperreflexive.
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We provide a short proof of the inequality (cf. Ben-Artzi and Klainerman [Regularity and decay of evolution equations, preprint] and Kato and Yajima [Rev. I m ~~(1+~~)~ " ~(1-4) " ~e " ~~~/*dt~C~~~~~~-cc with explicit (essentially exact) values for C. Recently Ben-Artzi and Klainerman [l] and Kato and Yajima [S] have focused interest on the estimate I I, 11(1 +x2)) " 2 (1-4)1'4ei'dUJ12dt<C IIU1...
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Sharp estimates are obtained for the rates of blow up of the norms of embeddings of Besov spaces in Lorentz spaces as the parameters approach critical values.
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ژورنال
عنوان ژورنال: Linear Algebra and its Applications
سال: 2014
ISSN: 0024-3795
DOI: 10.1016/j.laa.2014.05.035