Geodesic
Some Results on Post-Widder Operators Preserving Test Function $x^r$
Kragujevac Journal of Mathematics, Tome 46 (2022) no. 1, p. 149 .

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

In the present paper, we consider Post-Widder operators and its modified form which preserve the test function $x^r$, $r\in \mathbb{N}.$ We estimate direct results in terms of modulus of continuity for the modified operators. Also, some estimates for polynomially bounded functions and linear combinations are considered. Our estimates improve in some sense the previous results for the original Post-Widder operators.
Classification : 41A25, 41A36
Keywords: post-Widder operators, exponential functions, moments, polynomially bounded functions, linear combinations 
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Vijay Gupta; Gancho Tachev. Some Results on Post-Widder Operators Preserving Test Function $x^r$. Kragujevac Journal of Mathematics, Tome 46 (2022) no. 1, p. 149 . http://geodesic.mathdoc.fr/item/KJM_2022_46_1_a11/