TY - JOUR
AU - Chaoha, Phichet
AU - Goebel, Kazimierz
AU - Termwuttipong, Imchit
PY - 2012/04/23
Y2 - 2022/01/17
TI - Around Ulam's question on retractions
JF - Topological Methods in Nonlinear Analysis
JA - TMNA
VL - 40
IS - 1
SE -
DO -
UR - https://apcz.umk.pl/TMNA/article/view/TMNA.2012.029
SP - 215 - 224
AB - It is known that the unit ball in infinitely dimensional Hilbert space can be retracted onto its boundary via a lipschitzian mapping. The magnitude of Lipschitz constant is only roughly estimated. The note contains a number of observations connected to this result and opens some new problems.
ER -