Abstract
In this paper, using power series method we obtain a Korovkin type theorem for double sequences of real valued functions defined on a compact subset of \(\mathbb {R}^{2}\)(the real two-dimensional space). We also present an example that satisfies our theorem. Finally, we calculate the rate of convergence.
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Şahin, P.O., Dirik, F. A Korovkin-type theorem for double sequences of positive linear operators via power series method. Positivity 22, 209–218 (2018). https://doi.org/10.1007/s11117-017-0508-7
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DOI: https://doi.org/10.1007/s11117-017-0508-7