The 1-Lipschitz mapping between the unit spheres of two Hilbert spaces can be extended to a real linear isometry of the whole space
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Publication:2503772
DOI10.1007/BF02872336zbMath1107.46302OpenAlexW4244909004MaRDI QIDQ2503772
Publication date: 22 September 2006
Published in: Science in China. Series A (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1007/bf02872336
Hilbert and pre-Hilbert spaces: geometry and topology (including spaces with semidefinite inner product) (46C05) Isometric theory of Banach spaces (46B04)
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