Geodesic
On strong approximation of functions by positive operators
Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 30, Tome 440 (2015), pp. 68-80

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We consider questions of strong approximation of continuous functions by positive operators. The estimations are established in the terms of modulus of continuity and its convex majorant. 
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     author = {V. V. Zhuk},
     title = {On strong approximation of functions by positive operators},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {68--80},
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     volume = {440},
     year = {2015},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_2015_440_a5/}
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V. V. Zhuk. On strong approximation of functions by positive operators. Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 30, Tome 440 (2015), pp. 68-80. http://geodesic.mathdoc.fr/item/ZNSL_2015_440_a5/