Hyers–Ulam constants of Hilbert spaces
Volume 153 / 2002
Studia Mathematica 153 (2002), 31-40
MSC: Primary 46B20; Secondary 46C05.
DOI: 10.4064/sm153-1-3
Abstract
The best constant in the Hyers–Ulam theorem on isometric approximation in Hilbert spaces is equal to the Jung constant of the space.
