Abstract
Çakan et al. (2006) introduced the concept of
σ
-convergence for double sequences. In this work, we use this notion to prove the Korovkin-type approximation theorem for functions of two variables by using the test functions 1,
x
,
y
, and
x
2
+
y
2
and construct an example by considering the Bernstein polynomials of two variables in support of our main result.