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arXiv 1010.4574math.OA
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Hilbert C ~*-模中闭值域算子的乘积

The product of operators with closed range in Hilbert C*-modules

Kamran Sharifi

摘要:

设$T$和$S$是Hilbert C*-模之间具有闭值域的有界伴随算子,则$TS$有闭值域当且仅当$Ker(T)+Ran(S)$是正交和项,当且仅当$Ker(S^*)+Ran(T^*)$是正交和项.此外,如果$Ran(S)$和$Ker(T) \cap [Ker(T) \cap Ran(S)]^{\perp}$之间的Dixandom(或最小)角为正,并且$ \bar{Ker(S^*)+Ran(T^*)} $是正交被加数,则$TS$具有闭合范围。

英文摘要:

Suppose $T$ and $S$ are bounded adjointable operators with close range between Hilbert C*-modules, then $TS$ has closed range if and only if $Ker(T)+Ran(S)$ is an orthogonal summand, if and only if $Ker(S^*)+Ran(T^*)$ is an orthogonal summand. Moreover, if the Dixmier (or minimal) angle between $Ran(S)$ and $Ker(T) \cap [Ker(T) \cap Ran(S)]^{\perp}$ is positive and $ \bar{Ker(S^*)+Ran(T^*)} $ is an orthogonal summand then $TS$ has closed range.

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