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    The uniform convergence of a double sequence of functions at a point and Korovkin-type approximation theorems
    (Walter De Gruyter Gmbh, 2021) Dirik, Fadime; Demirci, Kamil; Yildiz, Sevda; Acu, Ana Maria
    In this paper, we introduce an interesting kind of convergence for a double sequence called the uniform convergence at a point. We give an example and demonstrate a Korovkin-type approximation theorem for a double sequence of functions using the uniform convergence at a point. Then we show that our result is stronger than the Korovkin theorem given by Volkov and present several graphs. Finally, in the last section, we compute the rate of convergence.