Abstract
In the theory of approximation following the well-known Weierstrass theorem, the study on direct results was initiated by Jackson’s classical work [160] on algebraic and trigonometric polynomials of best approximation.
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Gupta, V., Agarwal, R.P. (2014). Approximation by Certain Operators. In: Convergence Estimates in Approximation Theory. Springer, Cham. https://doi.org/10.1007/978-3-319-02765-4_2
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