On multilinear fractional strong maximal operator associated with rectangles and multiple weights

In this paper, the multilinear fractional strong maximal operator $\mathcal{M}_{\mathcal{R},α}$ associated with rectangles and corresponding multiple weights $A_{(\vec{p},q),\mathcal{R}}$ are introduced. Under the dyadic reverse doubling condition, a necessary and sufficient condition for two-weight inequalities is given. As consequences, we first obtain a necessary and sufficient condition for one-weight inequalities. Then, we give a new proof for the weighted estimates of multilinear fractional maximal operator $\mathcal{M}_α$ associated with cubes and multilinear fractional integral operator $\mathcal{I}_α$, which is quite different and simple from the proof known before.

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