Classification of certain types of underdetermined systems of ordinary differential equations.

The article offers information on how to determine and classify the ordinary differential equations' undetermined mathematical system. It cites the formulation for the autonomous differential equations as well as the smooth functions. However, it entails the complexness of the undetermined systems in terms of mathematical objects and differential equation. It connotes the usability of the Pfaff systems for nondegenerate linear transformation and coordinate changes. Furthermore, the solution in finding the equivalence of the undetermined systems as well as theorems are also provided.