Hilberträume mit amorphen basen
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Norbert Brunner (1984)
Compositio Mathematica
Varošanec, Sanja (2004)
JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
Taneli Huuskonen, Jussi Väısälä (2002)
Studia Mathematica
The best constant in the Hyers-Ulam theorem on isometric approximation in Hilbert spaces is equal to the Jung constant of the space.
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