
doi: 10.1007/bf01961008
We say that a function \(\delta\) (x) is a control function for an almost everywhere convergence of \(f_ n(x)\) to f(x) on [0,1], if for every \(\epsilon >0\) there exists an integer n(\(\epsilon)\) such that \(| f_ n(x)-f(x)| 0\), \(\gamma =\min (1,k/2)\) and \(\{\beta >1-\alpha /k\), \(01-\gamma /k\}\). If \(\sigma_ n^{\beta}(x)\) converges to f(x) a.e. on [0,1] and it has an \(L^ p\)- integrable control function for some \(p>0\), then \[ \lim_{n\to \infty}(1/A_ n^{\alpha})\sum^{n}_{\nu =0}A^{\alpha -1}_{n- \nu}| \sigma_{\nu}^{\beta -1}(x)-f(x)|^ k=0 \] a.e. on [0,1], and the above convergence has an \(L^ q\)-integrable control function, where \(q=\min (2,p)\).
Approximation to limiting values (summation of series, etc.), Summability and absolute summability of Fourier and trigonometric series, Orthogonal functions and polynomials, general theory of nontrigonometric harmonic analysis, control function
Approximation to limiting values (summation of series, etc.), Summability and absolute summability of Fourier and trigonometric series, Orthogonal functions and polynomials, general theory of nontrigonometric harmonic analysis, control function
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