Vanishing mean oscillation and continuity of rearrangements
ADVANCES IN MATHEMATICS(2024)
摘要
We study the decreasing rearrangement of functions in VMO, and show that for rearrangeable functions, the mapping f (sic) f* preserves vanishing mean oscillation. Moreover, as a map on BMO, while bounded, it is not continuous, but continuity holds at points in VMO (under certain conditions). This also applies to the symmetric decreasing rearrangement. Many examples are included to illustrate the results.(c) 2023 Published by Elsevier Inc.
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关键词
Vanishing mean oscillation,Monotone rearrangement
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