Revistes Catalanes amb Accés Obert (RACO)

Directional operators and mixed norms

J. Duoandikoetxea
DOI: 38031


We present a survey of mixed norm inequalities for several directional operators, namely, directional Hardy-Littlewood maximal functions and Hilbert transforms (both appearing in the method of rotations of Calderón and Zygmund), $X$-ray transforms, and directional fractional operators related to Riesz type potentials with variable kernel. In dimensions higher than two several interesting questions remain unanswered.

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