PERIODICA MATHEMATICA HUNGARICA, cilt.75, sa.2, ss.201-209, 2017 (SCI-Expanded)
In this note, using the idea of the late Professor Gadjiev (Mat Zametki 20(5):781-786, 1976), we give new, direct and easy proofs of the Korovkin theorems for positive linear operators acting on weighted spaces. Recent improvements and new applications are also presented.