Alphabeta Math
DefinitionDefinition: Literature-sourcedProof: Not applicablejudge pass (gpt-5.6-terra)audited 2026-09-04
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The centered and uncentered Hardy-Littlewood maximal functions

Definition

Assume the Axiom of Countable Choice (The Axiom of Countable Choice (ACω)).

Let f∈Lloc1(Rn). The centered Hardy-Littlewood maximal function of f is Mf(x):=sup⁡r>0Ar∣f∣(x)=sup⁡r>01λ(B(x,r))∫B(x,r)∣f(y)∣ dλ(y).

The uncentered Hardy-Littlewood maximal function of f is M∗f(x):=sup⁡x∈B(y,r)1λ(B(y,r))∫B(y,r)∣f(z)∣ dλ(z), where the supremum is over all Euclidean balls containing x.

Both functions take values in [0,∞].

Depends on

Used by

Dependency tree · two levels

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Sources