Korovkin-type approximation properties of bivariate q-Meyer-König and Zeller operators

In this study, Korovkin-type approximation properties of bivariate q-Meyer-König and Zeller operators are investigated. This thesis consists of six chapters. The first chapter is devoted to introduction. In the second chapter, general informations about the linear positive operators are given. In the third chapter, a generalization of the Meyer-König and Zeller (MKZ) operators based on q-integers are introduced and uniform convergence of these operators is investigated with the help of Heping-type Korovkin theorem. In addition, the rates of approximation of these operators are obtained with the help of the modulus of continuity and the elements of Lipschitz class functionals. In the fourth chapter, a bivariate generalization of the Meyer-König and Zeller operators based on q-integers is introduced and uniform convergence of these operators is examined with the help of either Heping-type Korovkin theorem and or Volkov theorem. Moreover the rates of convergence these operators are given by means of the modulus of continuity and the elements of Lipschitz class functionals for bivariate functions. In the fifth chapter, the operators which is the general family of Meyer-König and Zeller operators based on q-integers that include the operators given in the third chapter are introduced. At first, uniform convergence of these operators is investigated with the help of Heping-type Korovkin theorem. Later, the rates of convergence of these operator are given by means of modulus of continuity and the elements of Lipschitz class functionals. Also, an r-th order generalization of these operators are given. In the last chapter, operators being a bivariate generalization of a general sequence of are constructed. Uniform convergence of these operators is investigated with the help of either Heping-type Korovkin theorem or Volkov theorem. In addition, the rate of convergence of these operators are obtained by means of modulus of continuity and the elements of Lipschitz class functionals for bivariate functions. Finally, the r-th order generalization of these operators are given.