A note on the Kakeya maximal operator

Jose A. Barrionuevo
1996 Mathematical Research Letters  
In this paper we obtain an upper bound for the L 2 norm for maximal operators associated to arbitrary finite sets of directions in R 2 .
doi:10.4310/mrl.1996.v3.n1.a6 fatcat:yfgpqdorszgy5ocesyzkl6ra6y