Let C be a closed convex subset of the Banach space X. A subset F of C is called a nonexpansive retract of C if either F = ⊘ or there exists a retraction of C onto F which is a nonexpansive mapping.

American Journal of Mathematics Vol. 83, No. 1, Jan., 1961 Finite Groups Admitting a Fixed-Point-Free Automorphism of Order 4 This is the metadata section. Skip to content viewer section.

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