Differentiating along rectangles in lacunary directions

preprint2016arXivOpen access

Abstract

We show that, given some lacunary sequence of angles θ=(θj)j∈N\mathbfθ=(θ_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}_{\mathbfθ} obtained from B\mathcal{B} by allowing its elements to rotate around their lower left vertex by the angles θjθ_j, j∈Nj\in\mathbb{N}, fails to differentiate all Orlicz spaces lying between L1(R2)L^1(\mathbb{R}^2) and Llog⁡L(R2)L\log L(\mathbb{R}^2).

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