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arXiv 2103.09266math.FAmath.MG
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每个非光滑$2$维巴拿赫空间都具有Mazur-Ulam性质

Every non-smooth $2$-dimensional Banach space has the Mazur-Ulam property

Taras Banakh, Javier Cabello Sánchez

摘要:

一个巴拿赫空间$X$有$Mazur$ - $Ulam$ $property$,如果从$X$的单位球面到任何其他巴拿赫空间$Y$的单位球面的任何等距扩张到巴拿赫空间$X,Y$的线性等距。一个巴拿赫空间$X$称为$smooth$,如果单位球在单位球的每一点上都有唯一的支撑泛函.证明了每个非光滑二维巴拿赫空间都具有Mazur-Ulam性质。

英文摘要:

A Banach space $X$ has the $Mazur$-$Ulam$ $property$ if any isometry from the unit sphere of $X$ onto the unit sphere of any other Banach space $Y$ extends to a linear isometry of the Banach spaces $X,Y$. A Banach space $X$ is called $smooth$ if the unit ball has a unique supporting functional at each point of the unit sphere. We prove that each non-smooth 2-dimensional Banach space has the Mazur-Ulam property.

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