In this work tbere are definitions of matbematic concepts like cross product and function and examples of tbese, witb emphasis in tbe examples of functions in different sciences of tbe matbernatics. There are highlight of tbe importance, simplicity, utility of .tbe function concept and tbe functional tbought in such disciplines, tbose are applied in order to discuss tbe topoisomerase actions and tbe conclusion is tbat tbese concept and tbought must notutilize only in a few sciences.