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The boundedness below of 2×2 upper triangular operator matrices

✍ Scribed by In Sung Hwang; Woo Young Lee

Publisher
SP Birkhäuser Verlag Basel
Year
2001
Tongue
English
Weight
460 KB
Volume
39
Category
Article
ISSN
0378-620X

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The intersection of left (right) spectra
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✍ Yuan Li; Xiu-Hong Sun; Hong-Ke Du 📂 Article 📅 2006 🏛 Elsevier Science 🌐 English ⚖ 141 KB

When A ∈ B(H) and B ∈ B(K) are given, we denote by M C the operator matrix acting on the infinite- . In this paper, for given A and B, the sets C∈B l (K,H) σ l (M C ), C∈Inv(K,H) σ l (M C ) and C∈Inv(K,H) σ l (M C ) are determined, where σ l (T ), B l (K, H) and Inv(K, H) denote, respectively, the