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The Mazur–Ulam property for two-dimensional somewhere-flat spaces

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Abstract In this paper, we show that if X is a two-dimensional real normed space such that its unit sphere contains a line segment with the distance between its endpoints… Click to show full abstract

Abstract In this paper, we show that if X is a two-dimensional real normed space such that its unit sphere contains a line segment with the distance between its endpoints being greater than 1, then X has the Mazur–Ulam property. That is, every isometry from the unit sphere of X onto the unit sphere of any normed space Y can be extended to a linear isometry from X onto Y.

Keywords: mazur ulam; property two; ulam property; unit sphere; two dimensional

Journal Title: Linear Algebra and its Applications
Year Published: 2019

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