THE STABILITY OF THE LEFT INVERTIBLE OPERATORS IN BANACH SPACE
Xiujun Wu · Journal of Mathematics · 2001
The stability of the left invertible operators under the linear operation and some perturbation questions are discussed in this paper,and an example is given to explain that R(A)∩R(B)={0} is not necessary so that λA+B is also a left invertible operator for λ∈C when A and B are left invertible