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A rigidity phenomenon for the Hardy-Littlewood maximal function

Stefan Steinerberger — 2015

Studia Mathematica

The Hardy-Littlewood maximal function ℳ and the trigonometric function sin x are two central objects in harmonic analysis. We prove that ℳ characterizes sin x in the following way: Let $f \in C^{α} (ℝ, ℝ)$ be a periodic function and α > 1/2. If there exists a real number 0 < γ < ∞ such that the averaging operator $(A_{x} f) (r) = 1 / 2 r \int_{x - r}^{x + r} f (z) d z$ has a critical point at r = γ for every x ∈ ℝ, then f(x) = a + bsin(cx+d) for some a,b,c,d ∈ ℝ. This statement can be used to derive a characterization of trigonometric functions as those nonconstant...

The asymptotic behavior of the average $L^{p}$ -discrepancies and a randomized discrepancy.

Steinerberger, Stefan — 2010

The Electronic Journal of Combinatorics [electronic only]

A note on lacunary lonely runners. WITHDRAWN.

Steinerberger, Stefan — 2010

Journal of Integer Sequences [electronic only]

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