Approximation properties of multivariate exponential sampling series

Abstract

In this paper, we generalize the family of exponential sampling series for functions of $n$ variables and study their pointwise and uniform convergence as well as the rate of convergence for the functions belonging to space of $\log$-uniformly continuous functions. Furthermore, we state and prove the generalized Mellin-Taylor's expansion of multivariate functions. Using this expansion we establish pointwise asymptotic behaviour of the series by means of Voronovskaja type theorem.

Keywords

• multivariate exponential sampling series
• rate of convergence
• multivariate mellin-taylor formula
• voronovskaja theorem