# Hokkaido Mathematical Journal

## Hokkaido Mathematical Journal, 39 (2010) pp.115-126

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### Abstract

We introduce a weak $CMO$'' space $WCMO$ and consider the boundedness of the singular integral operators from $CMO$ to $WCMO$. Our result is the best possible.

MSC(Primary) 42B20(MSC2000), 42B35(MSC2000) $B^p$ space; $CMO$ space; weak $CMO$ space; standard singular integral operator;