Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4607719 | Journal of Approximation Theory | 2010 | 13 Pages |
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
Authors
Jesús Araujo, Juan J. Font,