Abstract:
Properties (including the approximating ones) are investigated of positive linear operators $L_n(f; x)$ for which the relation
$$
L_n((t-x)f(t);x)=\frac{\varphi(x)}{n}L_n'(f(t); x)
$$
is fulfilled, as well as the properties of operators $L_n^{(m)}(f; x)$.
The results are applicable, in particular, to Bernstein polynomials, to the operators of Mirak'yan, Baskakov, and others.
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