5 citations · 8 across the 6 of their papers we have counts for
6 papers
Perturbation of Browder Spectrum of Upper-triangular Operator Matrices
Shifang Zhang, Huaijie Zhong, Lin Zhang
Let is a 2-by-2 upper triangular operator matrix acting on the Banach space or Hilbert space . F…
Samuel multiplicities and Browder Spectrum of Operator Matrices
Shifang Zhang, Junde Wu
we show that the definitions of some classes of semi-Fredholm operators, which use the language of algebra and first introduced by X. Fang in [8], are equivalent to that of some we…
Non-disturbance criteria of quantum measurements
Wu Zhaoqi, Zhang Shifang, Wu Junde
Using the general sequential product proposed by Shen and Wu in [J. Phys. A: Math. Theor. 42, 345203, 2009], we derive three criteria for describing non-disturbance between quantum…
Fredholm Perturbation of Spectra of Upper Triangular Matrix
Zhang Shifang, Zhong Huaijie, Wu Junde
As we knew, study the perturbation theory of spectra of operator is a very important project in mathematics physics, in particular, in quantum mechanics. In this paper, we characte…
Spectra of Upper-triangular Operator Matrix
Zhang Shifang, Zhong Huaijie, Wu Junde
Let and be Banach spaces, , , , $M_{C}=({cc}A&C 0&B)$ be the operator matrix acting on the Banach space . In this paper, we g…
The Drazin inverse of the linear combinations of two idempotents in the Banach algebras
Zhang Shifang, Wu Junde
In this paper, some Drazin inverse representations of the linear combinations of two idempotents in Banach algebra are obtained.