Convergence Almost Everywhere of Orthorecursive Expansions in Functional Systems
Along with the convergence in \(L^2\)-norm, convergence almost everywhere of expansions in functional systems is a property of interest for both theoretical studies and applications. In this paper we present results on convergence almost everywhere for orthorecursive expansions which are a natural generalization of classical expansions in orthogonal systems. As a corollary of a more general result, we obtain a condition on coefficients of an expansion that guarantees convergence almost everywhere. We also show that this condition cannot be relaxed.
The authors thank Dr. Alexey Galatenko for valuable comments and discussions.
The research was supported by the Russian Foundation for Basic Research (project 14–01–00417) and the President grant for the support of the leading scientific schools of the Russian Federation (grant NSh–7461.2016.1).
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