Perturbation of spectrums of 2×2 operator matrices
Perturbation of spectrums of 2×2 operator matrices
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DOI:
10.1090/s0002-9939-1994-1185266-2
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发表时间:
1994-03
期刊:
影响因子:
--
通讯作者:
H. Du;Pan Jin
中科院分区:
文献类型:
--
作者:
H. Du;Pan Jin
In this paper, we study the perturbation of spectrums of 2 x 2 operator matrices such as Mc = [ ̂ CB ] on the Hubert space H®K . For given A and B , we prove that f| a(Mc) = o,(A) U as{B) u {A 6 C : n{B X) # d{A X)) , CeB(K.H) where o(T), ax{T), a¡(T), n(T), and d(T) denote the spectrum of T, approximation point spectrum, defect spectrum, nullity, and deficiency, respectively. Some related results are obtained.