Abstract
In this paper, we introduce the concepts of generalized regular points and narrow spectrum points of bounded linear operators on Hilbert spaces. The concept of generalized regular points is an extension of the concept regular points, and so, the set of all spectrum points is reduced to the narrow spectrum. We present not only the same and different properties of spectrum and of narrow spectrum but also show the relationship between them. Finally, the well known problem about the invariant subspaces of bounded linear operators on separable Hilbert spaces is simplified to the problem of the operator with narrow spectrum only.
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Supported by National Natural Science Foundation of China (Grant No. 11071051), Youth Science Foundation of Heilongjiang Province (Grant No. QC2009C73) and the State Committee for Scientific Research of Poland (Grant No. N N201 362236)
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Ma, H.F., Hudzik, H., Wang, Y.W. et al. The generalized regular points and narrow spectrum points of bounded linear operators on Hilbert spaces. Acta. Math. Sin.-English Ser. 26, 2349–2354 (2010). https://doi.org/10.1007/s10114-010-9329-3
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DOI: https://doi.org/10.1007/s10114-010-9329-3