On differentiation of integrals in the infinite-dimensional torus

Abstract

We answer the recently posed questions regarding the problem of differentiation of integrals for the Rubio de Francia basis $\mathcal{R}$ in the infinite torus $\mathbb{T}^\omega$. In particular, we prove that $\mathcal{R}$ does not differentiate $L^\infty(\mathbb{T}^\omega)$. Some remarks about differentiation in the context of arbitrary bases are also included.