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On the Lipschitzian retraction of the unit ball in infinite-dimensional Banach spaces onto its boundary. (English) Zbl 0472.54008

MSC:
54C15 Retraction
47H10 Fixed-point theorems
54H25 Fixed-point and coincidence theorems (topological aspects)
46B99 Normed linear spaces and Banach spaces; Banach lattices
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