Geodesic
On universal (in the sense of signs) Fourier series with respect to the Walsh system
Sbornik. Mathematics, Tome 215 (2024) no. 6, pp. 717-742 Cet article a éte moissonné depuis la source Math-Net.Ru

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We study the problem of the existence of (universal) functions whose Fourier–Walsh series are universal in the sense of signs in the class of almost finite measurable functions. Bibliography: 34 titles.
Keywords: universal function, Fourier–Walsh series, convergence almost everywhere. 
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M. G. Grigoryan. On universal (in the sense of signs) Fourier series with respect to the Walsh system. Sbornik. Mathematics, Tome 215 (2024) no. 6, pp. 717-742. http://geodesic.mathdoc.fr/item/SM_2024_215_6_a0/

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