
doi: 10.1137/0718063
In this paper we introduce a sequence of positive linear, interpolating operators $\Lambda _n (n = 1,2, \cdots )$, which map $c_{2\pi } $ (class of continuous ${2\pi }$-periodic functions) into the set of rational trigonometric functions of order $ \leqq 2n - 2$. Moreover, they satisfy \[ \left| {f(x) - \Lambda _n (f,x)} \right| \leqq 2\omega _f \left( {\frac{{\pi \sqrt 3 }} {n}} \right)\] and $\Lambda _n (f,x_{in} ) = f(x_{in} ),i = 0,1, \cdots ,n - 1,x_{in} = {{2i\pi }/n}$.
Approximation by rational functions, rational trigonometric approximation, Trigonometric approximation, Trigonometric interpolation, positive linear interpolating operator, Lipschitz condition
Approximation by rational functions, rational trigonometric approximation, Trigonometric approximation, Trigonometric interpolation, positive linear interpolating operator, Lipschitz condition
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