Kazimierz Goebel, "On the problem of retracting balls onto their boundary", Abstract and Applied Analysis, vol. 2003, Article ID 701343, 10 pages, 2003. https://doi.org/10.1155/S1085337503204103
On the problem of retracting balls onto their boundary
We provide some new estimates of the smallest possible Lipschitz constant for retractions of the unit ball onto the unit sphere in infinite-dimensional Banach spaces.
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