Weighted Extensions of Stein's Theorem for Linear and Multilinear Operators

We study weighted estimates for linear and multilinear integral operators whose kernels satisfy only size conditions.

Extending a theorem of E.

Stein and its refinement by Soria and Weiss, we prove weighted estimates on Herz and Cesàro type spaces, together with multilinear strong-type and weak-type analogues.

As applications, we derive consequences for a range of rough singular integral operators and related variants, including linear, oscillatory, and multilinear settings.