微分方程组有多个显式解的证明

First, second and third order system differential equation solution formula proved binary first order differential equations and the group consisting of ternary differential equations having a plurality of explicit solution. Then, with a second-order differential equation system solution proven formula must also satisfy the differential equation linear, homogeneous, pure solutions of real functions of the three conditions, numerical solution is correct. Conclusion: The lack of necessary first order differential equations of second order and third-order constraints guiding function; numerical solution can not be used as an approximate solution is correct various criteria. With such basic scientific theory, carry out applied scientific research, it is questionable. ?????