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arXiv 2005.11987math.FAmath.OA
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关于定义域为紧算子空间单位球面的满射等距的扩张

On the extension of surjective isometries whose domain is the unit sphere of a space of compact operators

Antonio M. Peralta

摘要:

证明了从任意复希尔伯特空间$H$上的所有紧算子的空间$K(H),$的单位球面到任意实巴拿赫空间$Y$的单位球面的满射等距都可以推广为从$K(H)$到$Y$的满射实线性等距.这可能是第一个例子的无限维非交换的C $^*$ -代数不包含酉和满足Mazur-乌拉姆性质。证明了所有紧C $^*$ -代数和所有弱紧JB $^*$ -三元组都满足Mazur-Ulam性质.

英文摘要:

We prove that every surjective isometry from the unit sphere of the space $K(H),$ of all compact operators on an arbitrary complex Hilbert space $H$, onto the unit sphere of an arbitrary real Banach space $Y$ can be extended to a surjective real linear isometry from $K(H)$ onto $Y$. This is probably the first example of an infinite dimensional non-commutative C$^*$-algebra containing no unitaries and satisfying the Mazur--Ulam property. We also prove that all compact C$^*$-algebras and all weakly compact JB$^*$-triples satisfy the Mazur--Ulam property.

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