A note on the adjoint of a perturbed operator

A note on the adjoint of a perturbed operator
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关于扰动算子的伴随的一个注记

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发表时间:
1964
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通讯作者:
R. Beals
R. Beals
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作者:
R. Beals

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设X和F是Banach空间。对于从X到F的算子,我们指的是定义域D(T)Qx和值域R(T)Qy的线性算子。一个从X到F的算子T称为Fredholm算子,如果T是闭的,零空间N(T)有有限维,值域R(T)是闭的,在F中有有限余维。我们用$(X,F)表示从X到F的所有Fredholm算子的集合。如果TE:$(X,F),T的指标定义为
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