Abstract
We characterize sequences of numbers (a n ) such that ∑n≥1 a n Φ n converges a.e. for any orthonormal system (Φ n ) in any L 2-space. In our criteria we use the set A={∑m≥n||a m |2;n≥1}, majorizing measures on A, and new descriptions of the complexity of A.
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Paszkiewicz, A. A complete characterization of coefficients of a.e. convergent orthogonal series and majorizing measures. Invent. math. 180, 55–110 (2010). https://doi.org/10.1007/s00222-009-0226-2
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DOI: https://doi.org/10.1007/s00222-009-0226-2