J4 ›› 2010, Vol. 45 ›› Issue (3): 90-95.

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On the perturbation of the Kato essential spectra for upper  triangular operator matrices

WANG Ji-rong1, CAO Xiao-hong2   

  1. 1. Department of Mathematics, Yuncheng University, Yuncheng 044000, Shanxi, China;
    2. College of Mathematics and Information Science, Shaanxi Normal University, Xi′an 710062, Shaanxi, China
  • Received:2009-05-21 Online:2010-03-16 Published:2010-04-02

Key words:  Kato spectrum; essential spectrum; Fredholm operator

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