Geodesic
Strong converse inequalities for the weighted simultaneous approximation by the Szász-Mirakjan operator
Serdica Mathematical Journal, Tome 46 (2021) no. 3, pp. 261-286.

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We establish two-term strong converse estimates of the rate of weighted simultaneous approximation by the Szász-Mirakjan operator for smooth functions in the supremum norm on the non-negative semi-axis. We consider Jacobi-type weights. The estimates are stated in terms of appropriate moduli of smoothness or \(K\)-functionals.
Keywords: Szász-Mirakjan operator, strong converse inequality, converse estimate, simultaneous approximation, modulus of smoothness, K-functional, 41A17, 41A25, 41A27, 41A28, 41A35, 41A40, 41A81 
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     title = {Strong converse inequalities for the weighted simultaneous approximation by the {Sz\'asz-Mirakjan} operator},
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Draganov, Borislav. Strong converse inequalities for the weighted simultaneous approximation by the Szász-Mirakjan operator. Serdica Mathematical Journal, Tome 46 (2021) no. 3, pp. 261-286. http://geodesic.mathdoc.fr/item/SMJ2_2021_46_3_a4/