Objectives . The paper discusses usability as the concept underlying many contemporary design trends and accompanying technological development in various industrial, graphic digital contexts. A formulation of contexts is advanced based on evolution industrial design. Methods. Using historical research method, shown to be characterized by unification form applied relationship between a person o...

In this paper, first the space of hyperbolic tangent functions is introduced and then the universal approximator property of this space is proved. In fact, by using this space, any nonlinear continuous function can be uniformly approximated with any degree of accuracy. Also, as an application, this space of functions is utilized to design feedback control for a nonlinear dynamical system.