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Notes on commutator on the variable exponent Lebesgue spaces

Dinghuai Wang — 2019

Czechoslovak Mathematical Journal

We obtain the factorization theorem for Hardy space via the variable exponent Lebesgue spaces. As an application, it is proved that if the commutator of Coifman, Rochberg and Weiss $[b, T]$ is bounded on the variable exponent Lebesgue spaces, then $b$ is a bounded mean oscillation (BMO) function.

The John-Nirenberg inequality for functions of bounded mean oscillation with bounded negative part

Min Hu; Dinghuai Wang — 2022

Czechoslovak Mathematical Journal

A version of the John-Nirenberg inequality suitable for the functions $b \in BMO$ with $b^{-} \in L^{\infty}$ is established. Then, equivalent definitions of this space via the norm of weighted Lebesgue space are given. As an application, some characterizations of this function space are given by the weighted boundedness of the commutator with the Hardy-Littlewood maximal operator.

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