Geodesic
A remark on the retracting of a ball onto a sphere in an infinite dimensional Hilbert space.
Mathematica Scandinavica, Tome 67 (1990) no. 2, pp. 223-226

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Mots-clés : existence of a lipschitzian retraction of a unit ball onto a unit sphere 
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     author = {Tomasz Komorowski and Jacek Wosko},
     title = {A remark on the retracting of a ball onto a sphere in an infinite dimensional {Hilbert} space.},
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     publisher = {mathdoc},
     volume = {67},
     number = {2},
     year = {1990},
     zbl = {0754.46017},
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Tomasz Komorowski; Jacek Wosko. A remark on the retracting of a ball onto a sphere in an infinite dimensional Hilbert space.. Mathematica Scandinavica, Tome 67 (1990) no. 2, pp. 223-226. http://geodesic.mathdoc.fr/item/MS2_1990__67_2_167135/