We investigate solutions of Witten-Dijkgraaf-E.Verlinde-H.Verlinde (WDVV) equations. The article discusses nonlinear equations of the third order for a function f = f(x; t) ) of two independent variables x; t . The ...

In this paper the economic aspects of the processing of the metallurgical production by-products such as a mill scale obtained by mechanical cleaning of hot-rolled steel strips and hematite obtained by spray roasting of ...