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On distance-preserving mappings

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Abstract

We generalize a theorem of W. Benz by proving the following result: Let Hµ be a half space of a real Hilbert space with dimension ¸ 3 and let Y be a real normed space which is strictly convex. If a distance ½ > 0 is contractive and another distance N½ (N ¸ 2) is extensive by a mapping f : Hµ ! Y , then the restriction fjHµ+½=2 is an isometry, where Hµ+½=2 is also a half space which is a proper subset of Hµ. Applying the above result, we also generalize a classical theorem of Beckman and Quarles.

참고문헌 (19)

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  17. "On the Mazur-Ulam theorem and the Aleksandrovproblem for unit distance preserving mapping", 118, pp.919~925 (1993)
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  19. "Congruence-preserving mappings", 43, pp.37~38 (1970)

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