In the year 1988 Guo
[1] introduced the integral modification of Meyer Konig and Zeller operators
and studied the rate of convergence for functions of bounded variation. Gupta
[2] gave the sharp estimates for these operators. This paper is an extensive
survey on the Meyer-K¨onig and Zeller operators. It includes most of the
modifications they have undergone through the years. We compute rate of
convergence of the defined operators by means of modulus of continuity.
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