Copyright © 1988 Published by Elsevier Inc.
Set-contractions and ball-contractions in some classes of spaces
Received 26 September 1986.
Submitted by Ky Fan
Available online 30 June 2004.
Abstract
Let X be a Banach space, D an arbitrary subset of X, and T: D → X a set-condensing (k-set-contractive) mapping. The main result of this paper is: If X = lp, 1
p
+ ∞, then T is ball-condensing (k-ball-contractive). It is also shown that this result does not hold for X = Lp([0, 1]), 1
p < + ∞, p ≠ 2.






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