Approximation by bivariate (p,q)-Baskakov-Kantorovich operators

The present paper deals with the bivariate (p, q)-Baskakov-Kantorovich operators and their approximation properties. First we construct the operators and obtain some auxiliary results such as calculations of moments and central moments, etc. Our main results consist of uniform convergence of the operators via the Korovkin theorem and rate of convergence in terms of modulus of continuity.