Mathematics – Classical Analysis and ODEs
Scientific paper
2005-10-28
J. Anal. Math. 84 (2001), 361-393
Mathematics
Classical Analysis and ODEs
25 pages. Part of GK's PhD thesis
Scientific paper
A Menshov spectrum is a subset of the integers that is sufficient for representing every measurable function as an almost-everywhere converging trigonometric (non-Fourier) sum. In this language the celebrated "Menshov representation theorem" states that Z is a Menshov spectrum. In this paper we construct 1) Menshov spectra that are almost exponentially sparse 2) that are almost squares. Then we show that the positive integers are not a Menshov spectrum but are a Menshov spectrum in measure, and repeat 1) and 2) in the analytic settings.
Kozma Gady
Olevskii Alexander
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