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arXiv 0811.1395math.OA
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商代数提升问题的几个例子

Some examples of lifting problems from quotient algebras

Hyun Ho Lee

摘要:

我们考虑了三个提升问题:给定一个$C\sp{*}$ -代数$I$,如果有一个酉$C\sp{*}$ -代数$A$包含$I$作为理想,那么从$A/I$到$A$的每一个酉是否提升为它的酉?从$A/I$中得到的幺正式是否提升为极值偏等距?从$A/I$得到的每一个极值偏等距都提升为极值偏等距吗?我们展示了$I$的几种结构,它们可以作为上述问题的工作示例或反例。

英文摘要:

We consider three lifting questions: Given a $C\sp{*}$-algebra $I$, if there is a unital $C\sp{*}$-algebra $A$ contains $I$ as an ideal, is every unitary from $A/I$ lifted to a unitary in $A$? is every unitary from $A/I$ lifted to an extremal partial isometry? is every extremal partial isometry from $A/I$ lifted to an extremal partial isometry? We show several constructions of $I$ which serve as working examples or counter-examples for above questions.

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