THE REDUCED MINIMUM MODULUS OF 2$\times$2 UPPER TRIANGULAR OPERATION MATRICES

Abstract

Equations. See Full-text

Keywords

• reduced minimum modulus;
• upper triangular operator matrices

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References

1. Machigan Math. J. v.32 The reduced minimum modules C. Apostol
2. Proc. Amer. Math. Soc. v.121 Perturbation of spectrums of 2×2 operator matrices H. K. Du;P. Jin
3. Unbonunded Linear Operators S. Goldberg
4. Proc. Amer. Math. Soc. v.128 Invertible completions of 2×2 upper triangular matrics J. K. Han;H. Y. Lee;W. Y. Lee
5. Invertibility and Singularity for Bounded Linear Operators R. E. Harte
6. Int. Eq. Op. Th. v.22 Norm inequalities of positive operator matrices J. C. Hou;H. K. Du
7. Perturbation theory for linear operators T. Kato