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On the Logarithmic Means of the Successively Derived Conjugate Series of a Fourier Series
Definition [ó]. A series ^c" is said to be summable (R, log w, k) or summable (R, k), to sum s, if RkM = 7rLTk^(l°z-)kc'> (log w)* n<w \ n I tends to a limit 5, as co-»«¡.i?*(co) is called the (i?, log co, fc) mean of Let the Fourier …