Approximation of signals of class \(Lip(\alpha , p)\) by linear operators. (English) Zbl 1213.42006

The authors extend several theorems pertaining to error estimates of trigonometric-Fourier approximation. They use in their theorems very general classes of lower triangular regular summability matrix methods having non-negative entries, assuming only certain almost monotonicity and regularity assumptions.


42A10 Trigonometric approximation
94A12 Signal theory (characterization, reconstruction, filtering, etc.)
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