A note on the adjoint of a perturbed operator
A note on the adjoint of a perturbed operator
复制标题
关于扰动算子的伴随的一个注记
DOI:
--
复制
发表时间:
1964
期刊:
影响因子:
--
通讯作者:
R. Beals
中科院分区:
文献类型:
--
作者:
R. Beals
Let X and F be Banach spaces. By an operator from X to F we mean a linear operator with domain D(T)QX and range R(T)QY. An operator T from X to F is said to be a Fredholm operator if T is closed, the null space N(T) has finite dimension, and the range R(T) is closed and has finite codimension in F. We denote by $(X, F) the set of all Fredholm operators from X to F. If TE:$(X, F), the index of T is defined to be