Approximation by sums of ridge functions with fixed directions
Vugar E. Ismailov · St Petersburg Mathematical Journal · 2017
The paper contains a survey of some results about approximation of functions of several variables by sums of ridge functions with fixed directions. Also, some new theorems are proved, both for uniform approximation and for approximation in $L_{2}$. These theorems generalize some results by the author known previously. The paper is finished by the study of the role of ridge functions in a problem of approximation by neural networks.