Abstract

1. Let f(x) be a real function of period 2π, integrable L over (0, 2π), and letBy sn(x) and σn (x) we denote respectively the partial sums and the first arithmetic means of the series (1·1). Similarly, by and we denote the partial sums and the first arithmetic means of the seriesconjugate to (1·1). By we mean the function conjugate to f(x), that iswhere the integral is taken in the principal-value sense.

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