Article ID Journal Published Year Pages File Type
4607719 Journal of Approximation Theory 2010 13 Pages PDF
Abstract

Let ϵ>0ϵ>0. A continuous linear operator T:C(X)⟶C(Y)T:C(X)⟶C(Y) is said to ϵϵ-preserve disjointness   if ‖(Tf)(Tg)‖∞≤ϵ‖(Tf)(Tg)‖∞≤ϵ, whenever f,g∈C(X)f,g∈C(X) satisfy ‖f‖∞=‖g‖∞=1‖f‖∞=‖g‖∞=1 and fg≡0fg≡0. In this paper we continue our study of the minimal interval where the possible maximal distance from a norm one operator which ϵϵ-preserves disjointness to the set of weighted composition maps may lie. We provide sharp bounds for both the finite and the infinite case, which turn out to be completely different.

Related Topics
Physical Sciences and Engineering Mathematics Analysis
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