English

Differentiating along rectangles in lacunary directions

Classical Analysis and ODEs 2016-09-16 v2

Abstract

We show that, given some lacunary sequence of angles θ=(θj)jN\mathbf{\theta}=(\theta_j)_{j\in\N} not converging too fast to zero, it is possible to build a rare differentiation basis B\mathcal{B} of rectangles parallel to the axes that differentiates L1(R2)L^1(\mathbb{R}^2) while the basis Bθ\mathcal{B}_{\mathbf{\theta}} obtained from B\mathcal{B} by allowing its elements to rotate around their lower left vertex by the angles θj\theta_j, jNj\in\mathbb{N}, fails to differentiate all Orlicz spaces lying between L1(R2)L^1(\mathbb{R}^2) and LlogL(R2)L\log L(\mathbb{R}^2).

Cite

@article{arxiv.1605.04734,
  title  = {Differentiating along rectangles in lacunary directions},
  author = {Laurent Moonens},
  journal= {arXiv preprint arXiv:1605.04734},
  year   = {2016}
}
R2 v1 2026-06-22T14:01:35.394Z