China
Estados Unidos
For the maximal operator M on Rd, and 1
∫QM(σ1Q)pdw≲σ(Q), for all cubes Q for which there is a cube P⊃Q satisfying σ(P)≤Dσ(Q), and ℓ(P)≥ρℓ(Q). This was recently proved by Kangwei Li and Eric Sawyer. We give a short proof, which is easily seen to hold for several closely related operators.
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